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,
I tried the tcp_frto = 1 and got the same results as = 2. Attached is
the output of the tcpdump for frto=1. I might not get to the patch
today as I am feeling a bit slow.
Thanks for the work!
--
Damon L. Chesser
damon@damtek.com
http://www.linkedin.com/in/dchesser
1210263858.691448 IP (tos 0x0, ttl 64, id 59590, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 390384065:390384577(512) ack 27168769 win 5840
1210263858.695038 IP (tos 0x0, ttl 100, id 75, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x7df5 (correct), 1:1(0) ack 512 win 1024
1210263858.695231 IP (tos 0x0, ttl 64, id 59591, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 1024:1536(512) ack 1 win 5840
1210263859.394452 IP (tos 0x0, ttl 100, id 76, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x7df5 (correct), 1:1(0) ack 512 win 1024
1210263859.394517 IP (tos 0x0, ttl 64, id 59592, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 512:1024(512) ack 1 win 5840
1210263859.400855 IP (tos 0x0, ttl 100, id 77, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x7bf5 (correct), 1:1(0) ack 1024 win 1024
1210263859.400880 IP (tos 0x0, ttl 64, id 59593, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 1536:2048(512) ack 1 win 5840
1210263860.096485 IP (tos 0x0, ttl 100, id 78, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x7bf5 (correct), 1:1(0) ack 1024 win 1024
1210263979.417094 IP (tos 0x0, ttl 64, id 59594, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 1024:1536(512) ack 1 win 5840
1210263979.421796 IP (tos 0x0, ttl 100, id 82, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x79f5 (correct), 1:1(0) ack 1536 win 1024
1210263979.421850 IP (tos 0x0, ttl 64, id 59595, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 2048:2560(512) ack 1 win 5840
1210263980.121475 IP (tos 0x0, ttl 100, id 83, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x79f5 (correct), 1:1(0) ack 1536 win 1024
1210263980.121525 IP (tos 0x0, ttl 64, id 59596, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 1536:2048(512) ack 1 win 5840
1210263980.127898 IP (tos 0x0, ttl 100, id 84, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x77f5 (correct), 1:1(0) ack 2048 win 1024
1210263980.127915 IP (tos 0x0, ttl 64, id 59597, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 2560:3072(512) ack 1 win 5840
1210263980.822754 IP (tos 0x0, ttl 100, id 85, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x77f5 (correct), 1:1(0) ack 2048 win 1024
1210264100.142724 IP (tos 0x0, ttl 64, id 59598, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 2048:2560(512) ack 1 win 5840
1210264100.148733 IP (tos 0x0, ttl 100, id 92, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x75f5 (correct), 1:1(0) ack 2560 win 1024
1210264100.148766 IP (tos 0x0, ttl 64, id 59599, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 3072:3584(512) ack 1 win 5840
1210264100.843579 IP (tos 0x0, ttl 100, id 93, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x75f5 (correct), 1:1(0) ack 2560 win 1024
1210264100.843629 IP (tos 0x0, ttl 64, id 59600, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 2560:3072(512) ack 1 win 5840
1210264100.850144 IP (tos 0x0, ttl 100, id 94, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x73f5 (correct), 1:1(0) ack 3072 win 1024
1210264100.850161 IP (tos 0x0, ttl 64, id 59601, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 3584:4096(512) ack 1 win 5840
1210264101.549783 IP (tos 0x0, ttl 100, id 95, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x73f5 (correct), 1:1(0) ack 3072 win 1024
1210264220.864362 IP (tos 0x0, ttl 64, id 59602, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 3072:3584(512) ack 1 win 5840
1210264220.870832 IP (tos 0x0, ttl 100, id 99, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x71f5 (correct), 1:1(0) ack 3584 win 1024
1210264220.870874 IP (tos 0x0, ttl 64, id 59603, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 4096:4608(512) ack 1 win 5840
1210264221.570637 IP (tos 0x0, ttl 100, id 100, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x71f5 (correct), 1:1(0) ack 3584 win 1024
1210264221.570684 IP (tos 0x0, ttl 64, id 59604, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 3584:4096(512) ack 1 win 5840
1210264221.577194 IP (tos 0x0, ttl 100, id 101, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x6ff5 (correct), 1:1(0) ack 4096 win 1024
1210264221.577211 IP (tos 0x0, ttl 64, id 59605, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 4608:5120(512) ack 1 win 5840
1210264222.271894 IP (tos 0x0, ttl 100, id 102, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x6ff5 (correct), 1:1(0) ack 4096 win 1024
1210264341.590019 IP (tos 0x0, ttl 64, id 59606, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 4096:4608(512) ack 1 win 5840
1210264341.593578 IP (tos 0x0, ttl 100, id 106, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x6df5 (correct), 1:1(0) ack 4608 win 1024
1210264341.593627 IP (tos 0x0, ttl 64, id 59607, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 5120:5632(512) ack 1 win 5840
1210264342.292717 IP (tos 0x0, ttl 100, id 110, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x6df5 (correct), 1:1(0) ack 4608 win 1024
1210264342.292767 IP (tos 0x0, ttl 64, id 59608, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 4608:5120(512) ack 1 win 5840
1210264342.299168 IP (tos 0x0, ttl 100, id 111, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x6bf5 (correct), 1:1(0) ack 5120 win 1024
1210264342.299188 IP (tos 0x0, ttl 64, id 59609, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 5632:6144(512) ack 1 win 5840
1210264342.999071 IP (tos 0x0, ttl 100, id 112, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x6bf5 (correct), 1:1(0) ack 5120 win 1024
1210264462.315638 IP (tos 0x0, ttl 64, id 59610, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 5120:5632(512) ack 1 win 5840
1210264462.320063 IP (tos 0x0, ttl 100, id 116, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x69f5 (correct), 1:1(0) ack 5632 win 1024
1210264462.320099 IP (tos 0x0, ttl 64, id 59611, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 6144:6656(512) ack 1 win 5840
1210264463.019784 IP (tos 0x0, ttl 100, id 117, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x69f5 (correct), 1:1(0) ack 5632 win 1024
1210264463.019848 IP (tos 0x0, ttl 64, id 59612, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 5632:6144(512) ack 1 win 5840
1210264463.026210 IP (tos 0x0, ttl 100, id 118, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x67f5 (correct), 1:1(0) ack 6144 win 1024
1210264463.026256 IP (tos 0x0, ttl 64, id 59613, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 6656:7168(512) ack 1 win 5840
1210264463.721025 IP (tos 0x0, ttl 100, id 119, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x67f5 (correct), 1:1(0) ack 6144 win 1024
1210264583.041283 IP (tos 0x0, ttl 64, id 59614, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 6144:6656(512) ack 1 win 5840
1210264583.047127 IP (tos 0x0, ttl 100, id 123, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x65f5 (correct), 1:1(0) ack 6656 win 1024
1210264583.047166 IP (tos 0x0, ttl 64, id 59615, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 7168:7680(512) ack 1 win 5840
1210264583.741856 IP (tos 0x0, ttl 100, id 124, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x65f5 (correct), 1:1(0) ack 6656 win 1024
1210264583.741920 IP (tos 0x0, ttl 64, id 59616, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 6656:7168(512) ack 1 win 5840
1210264583.748296 IP (tos 0x0, ttl 100, id 125, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x63f5 (correct), 1:1(0) ack 7168 win 1024
1210264583.748351 IP (tos 0x0, ttl 64, id 59617, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 7680:8192(512) ack 1 win 5840
1210264584.443149 IP (tos 0x0, ttl 100, id 126, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x63f5 (correct), 1:1(0) ack 7168 win 1024
1210264703.766913 IP (tos 0x0, ttl 64, id 59618, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 7168:7680(512) ack 1 win 5840
1210264703.770428 IP (tos 0x0, ttl 100, id 133, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x61f5 (correct), 1:1(0) ack 7680 win 1024
1210264703.770462 IP (tos 0x0, ttl 64, id 59619, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 8192:8704(512) ack 1 win 5840
1210264704.469029 IP (tos 0x0, ttl 100, id 134, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x61f5 (correct), 1:1(0) ack 7680 win 1024
1210264704.469076 IP (tos 0x0, ttl 64, id 59620, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 7680:8192(512) ack 1 win 5840
1210264704.475326 IP (tos 0x0, ttl 100, id 135, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x5ff5 (correct), 1:1(0) ack 8192 win 1024
1210264704.475346 IP (tos 0x0, ttl 64, id 59621, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 8704:9216(512) ack 1 win 5840
1210264705.170173 IP (tos 0x0, ttl 100, id 136, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x5ff5 (correct), 1:1(0) ack 8192 win 1024
1210264824.492552 IP (tos 0x0, ttl 64, id 59622, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 8192:8704(512) ack 1 win 5840
1210264824.496167 IP (tos 0x0, ttl 100, id 140, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x5df5 (correct), 1:1(0) ack 8704 win 1024
1210264824.496197 IP (tos 0x0, ttl 64, id 59623, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: . 9216:9728(512) ack 1 win 5840
1210264825.191007 IP (tos 0x0, ttl 100, id 141, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x5df5 (correct), 1:1(0) ack 8704 win 1024
1210264825.191069 IP (tos 0x0, ttl 64, id 59624, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 8704:9216(512) ack 1 win 5840
1210264825.197574 IP (tos 0x0, ttl 100, id 142, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x5bf5 (correct), 1:1(0) ack 9216 win 1024
1210264825.197623 IP (tos 0x0, ttl 64, id 59625, offset 0, flags [DF], proto TCP (6), length 552) 192.168.200.15.33718 > 192.168.200.150.9100: P 9728:10240(512) ack 1 win 5840
1210264825.897222 IP (tos 0x0, ttl 100, id 143, offset 0, flags [none], proto TCP (6), length 40) 192.168.200.150.9100 > 192.168.200.15.33718: ., cksum 0x5bf5 (correct), 1:1(0) ack 9216 win 1024
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