Date: Sat, 10 May 2008 23:33:56 -0700 From: Julian Elischer <julian@elischer.org> To: Bakul Shah <bakul@bitblocks.com> Cc: freebsd-current@freebsd.org Subject: Re: tcp over slow links broken? Message-ID: <48269354.80009@elischer.org> In-Reply-To: <20080511061218.D62E15B47@mail.bitblocks.com> References: <20080511061218.D62E15B47@mail.bitblocks.com>
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Bakul Shah wrote: > Sometime during the past month or so, tcp out over a slow > links seems to be broken and the symptom is really puzzling > to me! Here is my setup: > > A----B----DSL ~ ~ ~ ... ~ ~ DSL----C > [...] > > I looked through tcp related changes nn the sys commitlogs. > There are a lot of them lately.... However, this comment in > a checkin of 20008-4-17 21:38:18 UTC worries me :-) > > This change should introduce (ideally) little functional change. > However, it lays the groundwork for significantly increased > parallelism in the TCP/IP code. > > Trace 1 > ------- > 14:22:42.317406 IP B.55535 > C.ssh: . 4744:6204(1460) ack 2016 win 65535 > 14:22:42.317489 IP B.55535 > C.ssh: . 6204:7664(1460) ack 2016 win 65535 > 14:22:42.410739 IP C.ssh > B.55535: . ack 4744 win 64240 > 14:22:42.411144 IP B.55535 > C.ssh: . 7664:9124(1460) ack 2016 win 65535 > 14:22:42.411259 IP B.55535 > C.ssh: . 9124:10584(1460) ack 2016 win 65535 > 14:22:42.468350 IP C.ssh > B.55535: . ack 4744 win 65535 > 14:22:42.490556 IP C.ssh > B.55535: . ack 4744 win 65535 that is just plain wierd... B seems to have gone deaf. > 14:22:42.830171 IP B.55535 > C.ssh: . 4744:6204(1460) ack 2016 win 65535 > 14:22:43.470135 IP B.55535 > C.ssh: . 4744:6204(1460) ack 2016 win 65535 > 14:22:44.549944 IP B.55535 > C.ssh: . 4744:6204(1460) ack 2016 win 65535 > 14:22:46.509750 IP B.55535 > C.ssh: . 4744:6204(1460) ack 2016 win 65535 > 14:22:50.229210 IP B.55535 > C.ssh: . 4744:6204(1460) ack 2016 win 65535 have you made a kernel from each side of that commit and compared them? >
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