Why is there packet loss after "do fec"?

[didadidadi5]

My printf log;
got 0x57fc 0, ring_idx=0
got 0x57fc 1, ring_idx=0
got 0x57fc 2, ring_idx=0
got 0x57fc 5, ring_idx=0
got 0x57fc 6, ring_idx=0
got 0x57fc 7, ring_idx=0
got 0x57fc 9, ring_idx=0
got 0x57fc 10, ring_idx=0
do fec
got 0x57fc 11, ring_idx=-1
got 0x57fd 0, ring_idx=1
got 0x57fd 1, ring_idx=1
got 0x57fd 2, ring_idx=1
got 0x57fd 3, ring_idx=1
got 0x57fd 4, ring_idx=1
got 0x57fd 5, ring_idx=1
got 0x57fd 6, ring_idx=1
got 0x57fd 7, ring_idx=1
got 0x57fd 8, ring_idx=-1
got 0x57fd 9, ring_idx=-1
got 0x57fd 10, ring_idx=-1
got 0x57fd 11, ring_idx=-1
got 0x57fe 0, ring_idx=2
got 0x57fe 1, ring_idx=2
got 0x57fe 2, ring_idx=2
got 0x57fe 3, ring_idx=2
got 0x57fe 4, ring_idx=2
got 0x57fe 7, ring_idx=2
got 0x57fe 8, ring_idx=2
got 0x57fe 9, ring_idx=2
do fec
got 0x57fe 10, ring_idx=-1
got 0x57ff 0, ring_idx=3
got 0x57ff 1, ring_idx=3
got 0x57ff 2, ring_idx=3
got 0x57ff 3, ring_idx=3
got 0x57ff 5, ring_idx=3
got 0x57ff 6, ring_idx=3
got 0x57ff 7, ring_idx=3
got 0x57ff 8, ring_idx=3
do fec
got 0x57ff 9, ring_idx=-1
got 0x57ff 10, ring_idx=-1
got 0x57ff 11, ring_idx=-1
got 0x5800 0, ring_idx=4
got 0x5800 1, ring_idx=4
got 0x5800 2, ring_idx=4
got 0x5800 3, ring_idx=4
got 0x5800 4, ring_idx=4
got 0x5800 5, ring_idx=4
got 0x5800 6, ring_idx=4
got 0x5800 7, ring_idx=4
got 0x5800 8, ring_idx=-1
got 0x5800 9, ring_idx=-1
got 0x5800 10, ring_idx=-1
got 0x5800 11, ring_idx=-1
got 0x5801 0, ring_idx=5
got 0x5801 1, ring_idx=5
got 0x5801 2, ring_idx=5
got 0x5801 3, ring_idx=5
got 0x5801 4, ring_idx=5
got 0x5801 5, ring_idx=5
got 0x5801 6, ring_idx=5
got 0x5801 7, ring_idx=5
got 0x5801 8, ring_idx=-1
got 0x5801 9, ring_idx=-1
got 0x5801 10, ring_idx=-1
got 0x5801 11, ring_idx=-1
got 0x5802 0, ring_idx=6
got 0x5802 1, ring_idx=6
got 0x5802 2, ring_idx=6
got 0x5802 3, ring_idx=6
got 0x5802 4, ring_idx=6
got 0x5802 5, ring_idx=6
got 0x5802 6, ring_idx=6
got 0x5802 8, ring_idx=6
do fec
got 0x5802 9, ring_idx=-1
got 0x5802 10, ring_idx=-1
got 0x5802 11, ring_idx=-1
got 0x5803 0, ring_idx=7
got 0x5803 1, ring_idx=7
got 0x5803 2, ring_idx=7
got 0x5803 3, ring_idx=7
got 0x5803 4, ring_idx=7
got 0x5803 5, ring_idx=7
got 0x5803 6, ring_idx=7
got 0x5803 7, ring_idx=7
got 0x5803 8, ring_idx=-1
got 0x5803 9, ring_idx=-1
got 0x5803 10, ring_idx=-1
got 0x5803 11, ring_idx=-1
got 0x5804 0, ring_idx=8
got 0x5804 1, ring_idx=8
got 0x5804 2, ring_idx=8
got 0x5804 7, ring_idx=8
got 0x5804 9, ring_idx=8
got 0x5804 10, ring_idx=8
got 0x5804 11, ring_idx=8
got 0x5805 0, ring_idx=9
got 0x5805 1, ring_idx=9
got 0x5805 2, ring_idx=9
got 0x5805 3, ring_idx=9
got 0x5805 4, ring_idx=9
got 0x5805 5, ring_idx=9
got 0x5805 6, ring_idx=9
18060597 ANT 0 333:-39:-37:-35
18060597 PKT 334:0:334:66:0:0
got 0x5805 7, ring_idx=9
do fec
5 packets lost
got 0x5805 8, ring_idx=-1
got 0x5805 9, ring_idx=-1
got 0x5805 10, ring_idx=-1
got 0x5805 11, ring_idx=-1
got 0x5806 0, ring_idx=10
got 0x5806 1, ring_idx=10
got 0x5806 2, ring_idx=10
got 0x5806 3, ring_idx=10
got 0x5806 4, ring_idx=10
got 0x5806 5, ring_idx=10
got 0x5806 6, ring_idx=10
got 0x5806 7, ring_idx=10
got 0x5806 8, ring_idx=-1
got 0x5806 9, ring_idx=-1
got 0x5806 10, ring_idx=-1
got 0x5806 11, ring_idx=-1
got 0x5807 0, ring_idx=11
got 0x5807 1, ring_idx=11
got 0x5807 2, ring_idx=11
got 0x5807 3, ring_idx=11
got 0x5807 4, ring_idx=11
got 0x5807 5, ring_idx=11
got 0x5807 6, ring_idx=11
got 0x5807 7, ring_idx=11
got 0x5807 9, ring_idx=-1
got 0x5807 10, ring_idx=-1
got 0x5807 11, ring_idx=-1
got 0x5808 0, ring_idx=12
got 0x5808 1, ring_idx=12
got 0x5808 2, ring_idx=12
got 0x5808 3, ring_idx=12
got 0x5808 4, ring_idx=12
got 0x5808 5, ring_idx=12
got 0x5808 6, ring_idx=12
got 0x5808 7, ring_idx=12
got 0x5808 8, ring_idx=-1
got 0x5808 9, ring_idx=-1
got 0x5808 10, ring_idx=-1
got 0x5808 11, ring_idx=-1
got 0x5809 0, ring_idx=13
got 0x5809 1, ring_idx=13
got 0x5809 2, ring_idx=13
got 0x5809 3, ring_idx=13
got 0x5809 4, ring_idx=13
got 0x5809 5, ring_idx=13
got 0x5809 6, ring_idx=13
got 0x5809 7, ring_idx=13
got 0x5809 9, ring_idx=-1
got 0x5809 10, ring_idx=-1
got 0x5809 11, ring_idx=-1
got 0x580a 0, ring_idx=14
got 0x580a 1, ring_idx=14
got 0x580a 2, ring_idx=14
got 0x580a 3, ring_idx=14
got 0x580a 5, ring_idx=14
got 0x580a 6, ring_idx=14
got 0x580a 7, ring_idx=14
got 0x580a 8, ring_idx=14
do fec
got 0x580a 9, ring_idx=-1
got 0x580a 10, ring_idx=-1
got 0x580a 11, ring_idx=-1
got 0x580b 0, ring_idx=15
got 0x580b 1, ring_idx=15
got 0x580b 2, ring_idx=15
got 0x580b 4, ring_idx=15
got 0x580b 5, ring_idx=15
got 0x580b 6, ring_idx=15
got 0x580b 7, ring_idx=15
got 0x580b 8, ring_idx=15
do fec
got 0x580b 9, ring_idx=-1
got 0x580b 10, ring_idx=-1
got 0x580b 11, ring_idx=-1
got 0x580c 0, ring_idx=16
got 0x580c 1, ring_idx=16
got 0x580c 3, ring_idx=16
got 0x580c 4, ring_idx=16
got 0x580c 5, ring_idx=16
got 0x580c 6, ring_idx=16
got 0x580c 7, ring_idx=16
got 0x580c 8, ring_idx=16
do fec
got 0x580c 9, ring_idx=-1
got 0x580c 10, ring_idx=-1
got 0x580c 11, ring_idx=-1
got 0x580d 0, ring_idx=17
got 0x580d 1, ring_idx=17
got 0x580d 2, ring_idx=17
got 0x580d 3, ring_idx=17
got 0x580d 4, ring_idx=17
got 0x580d 5, ring_idx=17
got 0x580d 6, ring_idx=17
got 0x580d 7, ring_idx=17
got 0x580d 10, ring_idx=-1
got 0x580d 11, ring_idx=-1
got 0x580e 0, ring_idx=18
got 0x580e 1, ring_idx=18
got 0x580e 2, ring_idx=18
got 0x580e 3, ring_idx=18
got 0x580e 4, ring_idx=18
got 0x580e 6, ring_idx=18
got 0x580e 7, ring_idx=18
got 0x580e 8, ring_idx=18
do fec
got 0x580e 9, ring_idx=-1
got 0x580e 10, ring_idx=-1
got 0x580e 11, ring_idx=-1
got 0x580f 0, ring_idx=19
got 0x580f 1, ring_idx=19
got 0x580f 2, ring_idx=19
got 0x580f 3, ring_idx=19
got 0x580f 4, ring_idx=19
got 0x580f 5, ring_idx=19
got 0x580f 6, ring_idx=19
got 0x580f 7, ring_idx=19
got 0x580f 8, ring_idx=-1
got 0x580f 9, ring_idx=-1
got 0x580f 10, ring_idx=-1
got 0x5810 0, ring_idx=20
got 0x5810 1, ring_idx=20
got 0x5810 2, ring_idx=20
got 0x5810 3, ring_idx=20
got 0x5810 4, ring_idx=20
got 0x5810 5, ring_idx=20
got 0x5810 6, ring_idx=20
got 0x5810 7, ring_idx=20
got 0x5810 8, ring_idx=-1
got 0x5810 9, ring_idx=-1
got 0x5810 10, ring_idx=-1
got 0x5810 11, ring_idx=-1
got 0x5811 0, ring_idx=21
got 0x5811 1, ring_idx=21
got 0x5811 3, ring_idx=21
got 0x5811 4, ring_idx=21
got 0x5811 5, ring_idx=21
got 0x5811 6, ring_idx=21
got 0x5811 7, ring_idx=21
got 0x5811 8, ring_idx=21
do fec
got 0x5811 9, ring_idx=-1
got 0x5811 11, ring_idx=-1
got 0x5812 0, ring_idx=22
got 0x5812 1, ring_idx=22
got 0x5812 2, ring_idx=22
got 0x5812 3, ring_idx=22
got 0x5812 4, ring_idx=22
got 0x5812 5, ring_idx=22
got 0x5812 6, ring_idx=22
got 0x5812 7, ring_idx=22
got 0x5812 8, ring_idx=-1
got 0x5812 9, ring_idx=-1
got 0x5812 10, ring_idx=-1
got 0x5812 11, ring_idx=-1
got 0x5813 0, ring_idx=23
got 0x5813 1, ring_idx=23
got 0x5813 2, ring_idx=23
got 0x5813 3, ring_idx=23
got 0x5813 4, ring_idx=23
got 0x5813 5, ring_idx=23
got 0x5813 6, ring_idx=23
got 0x5813 7, ring_idx=23
got 0x5813 8, ring_idx=-1
got 0x5813 9, ring_idx=-1
got 0x5813 10, ring_idx=-1
got 0x5813 11, ring_idx=-1
got 0x5814 1, ring_idx=24
got 0x5814 2, ring_idx=24
got 0x5814 3, ring_idx=24
got 0x5814 4, ring_idx=24
got 0x5814 5, ring_idx=24
got 0x5814 6, ring_idx=24
got 0x5814 7, ring_idx=24
got 0x5814 8, ring_idx=24
do fec
got 0x5814 9, ring_idx=-1
got 0x5814 10, ring_idx=-1
got 0x5814 11, ring_idx=-1
got 0x5815 0, ring_idx=25
got 0x5815 1, ring_idx=25
got 0x5815 2, ring_idx=25
got 0x5815 3, ring_idx=25
got 0x5815 4, ring_idx=25
got 0x5815 5, ring_idx=25
got 0x5815 6, ring_idx=25
got 0x5815 7, ring_idx=25
got 0x5815 8, ring_idx=-1
got 0x5815 9, ring_idx=-1
got 0x5815 10, ring_idx=-1
got 0x5815 11, ring_idx=-1
got 0x5816 0, ring_idx=26
got 0x5816 1, ring_idx=26
got 0x5816 2, ring_idx=26
got 0x5816 3, ring_idx=26
got 0x5816 4, ring_idx=26
got 0x5816 5, ring_idx=26
got 0x5816 6, ring_idx=26
got 0x5816 7, ring_idx=26
got 0x5816 8, ring_idx=-1
got 0x5816 9, ring_idx=-1
got 0x5816 10, ring_idx=-1
got 0x5816 11, ring_idx=-1
got 0x5817 0, ring_idx=27
got 0x5817 1, ring_idx=27
got 0x5817 2, ring_idx=27
got 0x5817 5, ring_idx=27
got 0x5817 6, ring_idx=27
got 0x5817 8, ring_idx=27
got 0x5817 9, ring_idx=27
got 0x5817 10, ring_idx=27
do fec
got 0x5817 11, ring_idx=-1
got 0x5818 0, ring_idx=28
got 0x5818 1, ring_idx=28
got 0x5818 2, ring_idx=28
got 0x5818 3, ring_idx=28
got 0x5818 4, ring_idx=28
got 0x5818 5, ring_idx=28
got 0x5818 6, ring_idx=28
got 0x5818 7, ring_idx=28
got 0x5818 8, ring_idx=-1
got 0x5818 9, ring_idx=-1
got 0x5818 10, ring_idx=-1
got 0x5818 11, ring_idx=-1
got 0x5819 1, ring_idx=29
got 0x5819 2, ring_idx=29
got 0x5819 3, ring_idx=29
got 0x5819 4, ring_idx=29
got 0x5819 5, ring_idx=29
got 0x5819 6, ring_idx=29
got 0x5819 7, ring_idx=29
got 0x5819 8, ring_idx=29
do fec
got 0x5819 9, ring_idx=-1
got 0x5819 10, ring_idx=-1
got 0x5819 11, ring_idx=-1
got 0x581a 0, ring_idx=30
got 0x581a 1, ring_idx=30
got 0x581a 2, ring_idx=30
got 0x581a 3, ring_idx=30
got 0x581a 4, ring_idx=30
got 0x581a 5, ring_idx=30
got 0x581a 6, ring_idx=30
got 0x581a 7, ring_idx=30
got 0x581a 8, ring_idx=-1
got 0x581a 9, ring_idx=-1
got 0x581a 10, ring_idx=-1
got 0x581a 11, ring_idx=-1
got 0x581b 0, ring_idx=31
got 0x581b 1, ring_idx=31
got 0x581b 3, ring_idx=31
got 0x581b 4, ring_idx=31
got 0x581b 5, ring_idx=31
got 0x581b 6, ring_idx=31
got 0x581b 8, ring_idx=31
got 0x581b 9, ring_idx=31
do fec
got 0x581b 10, ring_idx=-1
got 0x581b 11, ring_idx=-1
got 0x581c 0, ring_idx=32
got 0x581c 1, ring_idx=32
got 0x581c 3, ring_idx=32
got 0x581c 4, ring_idx=32
got 0x581c 5, ring_idx=32
got 0x581c 6, ring_idx=32
got 0x581c 7, ring_idx=32
got 0x581c 8, ring_idx=32
do fec
got 0x581c 9, ring_idx=-1
got 0x581c 10, ring_idx=-1
got 0x581c 11, ring_idx=-1
got 0x581d 0, ring_idx=33
got 0x581d 1, ring_idx=33
got 0x581d 2, ring_idx=33
got 0x581d 3, ring_idx=33
got 0x581d 7, ring_idx=33
got 0x581d 8, ring_idx=33
got 0x581d 9, ring_idx=33
got 0x581d 10, ring_idx=33
do fec
got 0x581d 11, ring_idx=-1
got 0x581e 0, ring_idx=34
got 0x581e 1, ring_idx=34
got 0x581e 2, ring_idx=34
got 0x581e 3, ring_idx=34
got 0x581e 4, ring_idx=34
got 0x581e 5, ring_idx=34
got 0x581e 6, ring_idx=34
got 0x581e 7, ring_idx=34
got 0x581e 8, ring_idx=-1
got 0x581e 9, ring_idx=-1
got 0x581e 10, ring_idx=-1
got 0x581e 11, ring_idx=-1
got 0x581f 0, ring_idx=35
got 0x581f 1, ring_idx=35
got 0x581f 2, ring_idx=35
got 0x581f 3, ring_idx=35
got 0x581f 4, ring_idx=35
got 0x581f 5, ring_idx=35
got 0x581f 6, ring_idx=35
got 0x581f 7, ring_idx=35
got 0x581f 8, ring_idx=-1
got 0x581f 9, ring_idx=-1
got 0x581f 10, ring_idx=-1
got 0x581f 11, ring_idx=-1
got 0x5820 1, ring_idx=36
got 0x5820 2, ring_idx=36
got 0x5820 3, ring_idx=36
got 0x5820 4, ring_idx=36
got 0x5820 5, ring_idx=36
got 0x5820 6, ring_idx=36
got 0x5820 7, ring_idx=36
got 0x5820 8, ring_idx=36
do fec
got 0x5820 9, ring_idx=-1
got 0x5820 10, ring_idx=-1
got 0x5820 11, ring_idx=-1
got 0x5821 0, ring_idx=37
got 0x5821 1, ring_idx=37
got 0x5821 2, ring_idx=37
got 0x5821 3, ring_idx=37
got 0x5821 4, ring_idx=37
got 0x5821 5, ring_idx=37
got 0x5821 7, ring_idx=37
got 0x5821 8, ring_idx=37
do fec
got 0x5821 9, ring_idx=-1
got 0x5821 10, ring_idx=-1
got 0x5821 11, ring_idx=-1
got 0x5822 2, ring_idx=38
got 0x5822 3, ring_idx=38
got 0x5822 4, ring_idx=38
got 0x5822 5, ring_idx=38
got 0x5822 6, ring_idx=38
got 0x5822 7, ring_idx=38
got 0x5822 8, ring_idx=38
got 0x5822 9, ring_idx=38
do fec
got 0x5822 10, ring_idx=-1
got 0x5822 11, ring_idx=-1
got 0x5823 0, ring_idx=39
18061597 ANT 0 328:-38:-35:-33
18061597 PKT 329:0:329:87:5:0
got 0x5823 1, ring_idx=39
got 0x5823 2, ring_idx=39
got 0x5823 3, ring_idx=39
got 0x5823 4, ring_idx=39
got 0x5823 5, ring_idx=39
got 0x5823 6, ring_idx=39
got 0x5823 7, ring_idx=39
got 0x5823 8, ring_idx=-1
got 0x5823 9, ring_idx=-1
got 0x5823 10, ring_idx=-1
got 0x5823 11, ring_idx=-1

[didadidadi5]

log;
3172902 ANT 0 306:-26:-25:-23
3172902 PKT 307:0:307:46:8:0
3173902 ANT 0 318:-27:-25:-23
3173902 PKT 319:0:319:98:0:0
3174902 ANT 0 320:-26:-25:-24
3174902 PKT 321:0:321:64:0:0
8 packets lost
7 packets lost
3175902 ANT 0 302:-26:-25:-24
3175902 PKT 302:0:302:94:15:0
2 packets lost
8 packets lost
3176902 ANT 0 306:-27:-25:-24
3176902 PKT 306:0:306:82:10:0
3177902 ANT 0 307:-27:-25:-24
3177902 PKT 308:0:308:97:0:0
6 packets lost
3178902 ANT 0 297:-26:-25:-23
3178902 PKT 298:0:298:94:6:0
3179902 ANT 0 301:-26:-25:-24
3179902 PKT 302:0:302:102:0:0
3180902 ANT 0 321:-26:-25:-24
3180902 PKT 322:0:322:55:0:0
7 packets lost
3181902 ANT 0 297:-26:-24:-22
3181902 PKT 298:0:298:60:7:0
3182902 ANT 0 318:-26:-24:-23
3182902 PKT 319:0:319:101:0:0
3183902 ANT 0 316:-26:-24:-22
3183902 PKT 316:0:316:92:0:0
3184902 ANT 0 325:-26:-24:-22
3184902 PKT 326:0:326:71:0:0
3185902 ANT 0 306:-26:-24:-22
3185902 PKT 307:0:307:87:0:0
8 packets lost
3186902 ANT 0 332:-26:-24:-22
3186902 PKT 333:0:333:38:8:0
3187902 ANT 0 307:-26:-24:-23
3187902 PKT 308:0:308:81:0:0
7 packets lost
3188902 ANT 0 311:-26:-24:-22
3188902 PKT 312:0:312:70:7:0
3189902 ANT 0 284:-26:-24:-22
3189902 PKT 285:0:285:105:0:0
3190902 ANT 0 308:-26:-24:-22
3190902 PKT 308:0:308:90:0:0
3191902 ANT 0 304:-26:-24:-22
3191902 PKT 305:0:305:69:0:0
8 packets lost
8 packets lost
3192902 ANT 0 308:-28:-25:-23
3192902 PKT 309:0:309:93:16:0
3193902 ANT 0 303:-28:-27:-25
3193902 PKT 304:0:304:102:0:0
3194902 ANT 0 319:-28:-25:-24
3194902 PKT 320:0:320:78:0:0
3195902 ANT 0 299:-28:-26:-24
3195902 PKT 300:0:300:76:0:0
3196902 ANT 0 331:-28:-26:-24
3196902 PKT 332:0:332:85:0:0

[didadidadi5]

unable to decrypt packet #0x851f06
unable to decrypt packet #0x851f07
unable to decrypt packet #0x851f09
unable to decrypt packet #0x851f0a
unable to decrypt packet #0x851f0b
unable to decrypt packet #0x852000
unable to decrypt packet #0x852001
unable to decrypt packet #0x852002
unable to decrypt packet #0x852003
unable to decrypt packet #0x852004
unable to decrypt packet #0x852005
unable to decrypt packet #0x852006
unable to decrypt packet #0x852007
unable to decrypt packet #0x852009
unable to decrypt packet #0x85200a
unable to decrypt packet #0x85200b
unable to decrypt packet #0x852100
unable to decrypt packet #0x852101
unable to decrypt packet #0x852102
unable to decrypt packet #0x852103
unable to decrypt packet #0x852104
unable to decrypt packet #0x852105
unable to decrypt packet #0x852106
unable to decrypt packet #0x852107
unable to decrypt packet #0x852108
unable to decrypt packet #0x852109
unable to decrypt packet #0x85210a
unable to decrypt packet #0x85210b
New session detected
272655 packets lost
do fec
do fec
do fec
18441926 ANT 0 100:-42:-40:-40
18441926 PKT 338:237:101:18:272655:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
8 packets lost
do fec
do fec
18442926 ANT 0 321:-42:-40:-40
18442926 PKT 322:0:322:74:8:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
6 packets lost
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18443926 ANT 0 309:-42:-40:-39
18443926 PKT 310:0:310:93:6:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18444926 ANT 0 329:-40:-38:-37
18444926 PKT 330:0:330:83:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18445926 ANT 0 351:-40:-39:-37
18445926 PKT 352:0:352:70:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18446926 ANT 0 335:-40:-39:-39
18446926 PKT 335:0:335:62:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18447926 ANT 0 338:-40:-39:-39
18447926 PKT 339:0:339:37:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
7 packets lost
18448926 ANT 0 336:-40:-39:-39
18448926 PKT 337:0:337:42:7:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18449926 ANT 0 325:-40:-39:-39
18449926 PKT 326:0:326:89:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
8 packets lost
do fec
do fec
18450926 ANT 0 324:-40:-39:-39
18450926 PKT 325:0:325:97:8:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18451926 ANT 0 325:-40:-39:-39
18451926 PKT 326:0:326:72:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18452926 ANT 0 306:-40:-39:-39
18452926 PKT 307:0:307:92:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18453926 ANT 0 319:-40:-39:-39
18453926 PKT 319:0:319:66:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18454926 ANT 0 320:-40:-39:-39
18454926 PKT 321:0:321:73:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18455926 ANT 0 341:-40:-39:-39
18455926 PKT 342:0:342:70:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
7 packets lost
do fec
18456926 ANT 0 342:-40:-39:-39
18456926 PKT 343:0:343:49:7:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
8 packets lost
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18457926 ANT 0 327:-40:-39:-39
18457926 PKT 328:0:328:77:8:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18458926 ANT 0 339:-40:-39:-39
18458926 PKT 340:0:340:82:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
18459926 ANT 0 322:-43:-39:-37
18459926 PKT 322:0:322:74:0:0
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
do fec
7 packets lost
do fec
do fec
do fec
do fec
18460926 ANT 0 325:-47:-40:-37
18460926 PKT 326:0:326:57:7:0

[didadidadi5]

befinvtiv's rx log:
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Could not fully reconstruct block 14290! Damage rate: 0.011298 (88 / 7789 blocks)
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -20dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -20dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -20dBm
Signal (card 0): -20dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -20dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -20dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -20dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -20dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -20dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -17dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Could not fully reconstruct block 142ac! Damage rate: 0.011385 (89 / 7817 blocks)
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -20dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Could not fully reconstruct block 142af! Damage rate: 0.011509 (90 / 7820 blocks)
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -18dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -20dBm
Signal (card 0): -18dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm
Signal (card 0): -19dBm

[didadidadi5]

code:
if(ring_idx == rx_ring_front)
{
// check if any packets without gaps
while(p->send_fragment_idx < fec_k && p->fragment_map[p->send_fragment_idx])
{
send_packet(ring_idx, p->send_fragment_idx);
p->send_fragment_idx += 1;
}
}

// or we can reconstruct gaps via FEC  
if(p->send_fragment_idx < fec_k && p->has_fragments == fec_k)
{
    printf("do fec\n");
    apply_fec(ring_idx);
    while(p->send_fragment_idx < fec_k)
    {
        count_p_fec_recovered += 1;
        send_packet(ring_idx, p->send_fragment_idx);
        p->send_fragment_idx += 1;
    }
}

if(p->send_fragment_idx == fec_k)
{
    int nrm = modN(ring_idx - rx_ring_front, RX_RING_SIZE);
    for(int i=0; i <= nrm; i++)
    {
        rx_ring_front = modN(rx_ring_front + 1, RX_RING_SIZE);
        rx_ring_alloc -= 1;
    }
    p->has_fragments=0;
    assert(rx_ring_alloc >= 0);
}

got 0x5804 0, ring_idx=8
got 0x5804 1, ring_idx=8
got 0x5804 2, ring_idx=8
got 0x5804 7, ring_idx=8
got 0x5804 9, ring_idx=8
got 0x5804 10, ring_idx=8
got 0x5804 11, ring_idx=8
got 0x5805 0, ring_idx=9
got 0x5805 1, ring_idx=9
got 0x5805 2, ring_idx=9
got 0x5805 3, ring_idx=9
got 0x5805 4, ring_idx=9
got 0x5805 5, ring_idx=9
got 0x5805 6, ring_idx=9
18060597 ANT 0 333:-39:-37:-35
18060597 PKT 334:0:334:66:0:0
got 0x5805 7, ring_idx=9
do fec
5 packets lost
got 0x5805 8, ring_idx=-1
got 0x5805 9, ring_idx=-1
got 0x5805 10, ring_idx=-1
got 0x5805 11, ring_idx=-1

因吹思听。。。。。。

[didadidadi5]

如果某块里的分片不连续且总包数没8包，这块的前面的连续分片会通过“send_packet”发出去，后面的分片不会通过 “send_packet” 发出去；当下个块没有丢包或有足够包，只有收到8包，做丢包恢复“apply_fec(ring_idx)”有效分片才能通过“send_packet”发出去。那个丢包不能恢复的块会造成花屏。有时几乎每1s（20块）就会丢一块。

[svpcom]

If the fragments in a block are not continuous and the total number of packets is less than 8 packets, the previous continuous fragments of this block will be sent through "send_packet", and the following fragments will not be sent through "send_packet"; the next block does not have If the packet is lost or there are enough packets, only 8 packets are received and the effective fragments of "apply_fec(ring_idx)" for packet loss recovery can be sent through "send_packet". The unrecoverable block of the lost packet will cause the screen to be blurred. Sometimes one block is lost almost every 1s (20 blocks).

WIth fec(K, N) scheme first K packets are data packets followed by (N - K) fec packets. If there are no packet loss we can ignore last (N-K) fec packets after receiving first K packets to reduce latency (we don't need to wait all N packets of fec block).

If there is packet loss then we need to get any K packets from N to recover block. If we got less than K packets then FEC unable to recover all packets in block but we can issue anyway any packets with index < K (ordinary data packets). We got some data loss, but not lost of all packets in block.

If you use several wifi adapters then data packets can arrive in out of order (due to independent internal HW queues and multipath radio propagation). But if we have unfinished block (with < K packets) and new block is ready then we should issue data packets from it as is because we will never got missing packets.

[didadidadi5]

在这个例子中，块号8前面0,1,2包能通过函数send packet发出去，后面的即使接收收到了也不会通过函数send packet发出去。也就是为什么会丢5包（5 packets lost）。因为这个块接收的包数只有7包。（能不能通过填充丢的包也把那个不能用前向纠错恢复的块也发出去，2.4g频段干扰确实有点烦人）。也许用两个网卡就能让8号块能恢复的几率很高。
In this example, packets 0, 1 and 2 in front of block No. 8 can be sent through the function send packet, and the subsequent packets will not be sent through the function send packet even if they are received. That is why 5 packets are lost. Because the number of packets received by this block is only 7 packets（ Can you also send out the block that cannot be recovered by forward error correction by filling the lost packet? 2.4G band interference is really annoying). Maybe two network cards can make block 8 recover, which has a high probability.

[svpcom]

FEC is 8/12

# new block 5804
got 0x5804 0, ring_idx=8  # data, in order, issue now
got 0x5804 1, ring_idx=8  # data, in order, issue now
got 0x5804 2, ring_idx=8  # data, in order, issue now
got 0x5804 7, ring_idx=8  # data, out of order, wait for fec
got 0x5804 9, ring_idx=8  # fec, wait
got 0x5804 10, ring_idx=8  # fec, wait 
got 0x5804 11, ring_idx=8  # fec, wait
# we got 7 packets -> unable to reconstruct fec until get at least 8
# new block 5805
got 0x5805 0, ring_idx=9 # data, wait because block 5804 is not full
got 0x5805 1, ring_idx=9 # data, wait because block 5804 is not full
got 0x5805 2, ring_idx=9 # data, wait because block 5804 is not full
got 0x5805 3, ring_idx=9 # data, wait because block 5804 is not full
got 0x5805 4, ring_idx=9  # data, wait because block 5804 is not full
got 0x5805 5, ring_idx=9  # data, wait because block 5804 is not full
got 0x5805 6, ring_idx=9  # data, wait because block 5804 is not full
got 0x5805 7, ring_idx=9  # data, wait because block 5804 is not full
do fec              # we got 8 data packets of block 5805 -> issue them to output, fec is not needed
5 packets lost  # but before that issue one data packet (#7) from block 5804 and close it
got 0x5805 8, ring_idx=-1 # ignore all fec packets of block 5805 - they are not needed now
got 0x5805 9, ring_idx=-1
got 0x5805 10, ring_idx=-1
got 0x5805 11, ring_idx=-1

[svpcom]

but it should show 4 packets lost instead of 5 packets lost

[svpcom]

Do you use last version from master branch?

[svpcom]

@didadidadi5 fec bug fixed in latest commits