Bug#478062: Fix FRTO+NewReno problem (Was: Re: This has a work around)
Ilpo Järvinen wrote:
SNIP
Could you next try with tcp_frto set to 1, if my theory proves to be
correct, it too should be "enough" to fix the problem (in this
particular case). Of course you can verify the patch below too if you
want to, the patch should allow cups<->printer to work with tcp_frto =
2 too. In case you have problem to apply the patch to the particular
version you're want to try with, just send a note about the version
number to me so I can adapt the patch for you (space etc. formatting
issues may show up because I recently run a code style cleanup on the
tcp code).
Ilpo,
reran the print job with the correct kernel (for control reasons) and
received the same results: tcp_frto=1 no print. tcp_frto=0 I can
print. Attached is the output of tcpdump
uname -r = 2.6.24-1-amd64
Thanks for the work!
--
Damon L. Chesser
damon@damtek.com
http://www.linkedin.com/in/dchesser
1210269685.442292 IP (tos 0x0, ttl 64, id 65247, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: P 1730585386:1730585898(512) ack 129179649 win 5840
1210269685.446179 IP (tos 0x0, ttl 100, id 22, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x7134 (correct), 1:1(0) ack 512 win 1024
1210269685.446221 IP (tos 0x0, ttl 64, id 65248, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: P 1024:1536(512) ack 1 win 5840
1210269686.140866 IP (tos 0x0, ttl 100, id 23, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x7134 (correct), 1:1(0) ack 512 win 1024
1210269714.626282 IP (tos 0x0, ttl 64, id 65249, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: . 512:1024(512) ack 1 win 5840
1210269714.632392 IP (tos 0x0, ttl 100, id 24, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6f34 (correct), 1:1(0) ack 1024 win 1024
1210269714.632425 IP (tos 0x0, ttl 64, id 65250, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: . 1536:2048(512) ack 1 win 5840
1210269715.327141 IP (tos 0x0, ttl 100, id 25, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6f34 (correct), 1:1(0) ack 1024 win 1024
1210269772.998283 IP (tos 0x0, ttl 64, id 65251, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: P 1024:1536(512) ack 1 win 5840
1210269773.005111 IP (tos 0x0, ttl 100, id 29, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6d34 (correct), 1:1(0) ack 1536 win 1024
1210269773.005144 IP (tos 0x0, ttl 64, id 65252, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: P 2048:2560(512) ack 1 win 5840
1210269773.704682 IP (tos 0x0, ttl 100, id 30, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6d34 (correct), 1:1(0) ack 1536 win 1024
1210269889.738282 IP (tos 0x0, ttl 64, id 65253, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: . 1536:2048(512) ack 1 win 5840
1210269889.745981 IP (tos 0x0, ttl 100, id 37, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6b34 (correct), 1:1(0) ack 2048 win 1024
1210269889.746012 IP (tos 0x0, ttl 64, id 65254, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: . 2560:3072(512) ack 1 win 5840
1210269890.444886 IP (tos 0x0, ttl 100, id 38, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6b34 (correct), 1:1(0) ack 2048 win 1024
1210270009.746305 IP (tos 0x0, ttl 64, id 65255, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: P 2048:2560(512) ack 1 win 5840
1210270009.752297 IP (tos 0x0, ttl 100, id 42, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6934 (correct), 1:1(0) ack 2560 win 1024
1210270009.752335 IP (tos 0x0, ttl 64, id 65256, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: P 3072:3584(512) ack 1 win 5840
1210270010.449445 IP (tos 0x0, ttl 100, id 43, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6934 (correct), 1:1(0) ack 2560 win 1024
1210270129.749294 IP (tos 0x0, ttl 64, id 65257, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: . 2560:3072(512) ack 1 win 5840
1210270129.755196 IP (tos 0x0, ttl 100, id 47, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6734 (correct), 1:1(0) ack 3072 win 1024
1210270129.755227 IP (tos 0x0, ttl 64, id 65258, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.53527 > 192.168.200.150.9100: . 3584:4096(512) ack 1 win 5840
1210270130.453997 IP (tos 0x0, ttl 100, id 48, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.53527: ., cksum 0x6734 (correct), 1:1(0) ack 3072 win 1024
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