From: "Ilpo Järvinen" <ilpo.jarvinen@helsinki.fi>
To: Ingo Molnar <mingo@elte.hu>
Cc: Herbert Xu <herbert@gondor.apana.org.au>,
w@1wt.eu, David Miller <davem@davemloft.net>,
davidn@davidnewall.com, torvalds@linux-foundation.org,
Andrew Morton <akpm@linux-foundation.org>,
Netdev <netdev@vger.kernel.org>,
LKML <linux-kernel@vger.kernel.org>,
stefanr@s5r6.in-berlin.de, rjw@sisk.pl
Subject: Re: [TCP bug, regression] stuck distcc connections in latest -git
Date: Thu, 24 Jul 2008 13:03:33 +0300 (EEST) [thread overview]
Message-ID: <Pine.LNX.4.64.0807241253150.24801@wrl-59.cs.helsinki.fi> (raw)
In-Reply-To: <Pine.LNX.4.64.0807241233130.24801@wrl-59.cs.helsinki.fi>
[-- Attachment #1: Type: TEXT/PLAIN, Size: 2182 bytes --]
On Thu, 24 Jul 2008, Ilpo Järvinen wrote:
> On Thu, 24 Jul 2008, Herbert Xu wrote:
>
> > Ingo Molnar <mingo@elte.hu> wrote:
> > >
> > > the client (running 2.6.24) does periodic 120 seconds retransmits:
> > >
> > > 07:40:48.255452 IP dione.39201 > phoenix.distcc: . 1608:2144(536) ack 1 win 584007:40:48.255547 IP phoenix.distcc > dione.39201: . ack 2144 win 65535
> > > 07:40:48.255564 IP dione.39201 > phoenix.distcc: . 67143:67679(536) ack 1 win 5840
> > > 07:40:48.255648 IP phoenix.distcc > dione.39201: . ack 2144 win 65535
> > > 07:42:48.255440 IP dione.39201 > phoenix.distcc: . 2144:2680(536) ack 1 win 5840
> > > 07:42:48.255559 IP phoenix.distcc > dione.39201: . ack 2680 win 65535
> > > 07:42:48.255570 IP dione.39201 > phoenix.distcc: . 67679:68215(536) ack 1 win 5840
> > > 07:42:48.255659 IP phoenix.distcc > dione.39201: . ack 2680 win 65535
> > > 07:44:48.255436 IP dione.39201 > phoenix.distcc: . 2680:3216(536) ack 1 win 584007:44:48.255570 IP phoenix.distcc > dione.39201: . ack 3216 win 65535
> > > 07:44:48.255585 IP dione.39201 > phoenix.distcc: . 68215:68751(536) ack 1 win 5840
> > > 07:44:48.255669 IP phoenix.distcc > dione.39201: . ack 3216 win 65535
> >
> > OK, something's seriously screwed up on dione's kernel. Could
> > you please disable syncookies (which should enable SACK for you)
> > and see if the problem goes away?
>
> This looks like the FRTO bugs we fixed in 2.6.25.7, afaik, 2.6.24.y wasn't
> anymore updated at that time so it's a bit obsolete...
But there might be something very interesting on the opposite end change
that is pointed out by this behavior, since one needs considerable amount
of losses in the outstanding window to triggers long delays (the bug was
that FRTO never fallback to go-back-n retransmissions, so one RTO was
necessary per loss), like you found out there's slow progress made and the
situation can resolve (by a big cumulative ACK once all losses are
cleared). Would the receiver for some reason not accept the new data
segment that FRTO sends after getting the ACK of the retransmissions,
the RTO loop would continue forever with FRTO bug (unless userland tears
the connection down).
--
i.
next prev parent reply other threads:[~2008-07-24 10:03 UTC|newest]
Thread overview: 204+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-20 17:44 [GIT]: Networking David Miller
2008-07-20 17:59 ` Arjan van de Ven
2008-07-20 23:52 ` David Miller
2008-07-21 20:32 ` David Miller
2008-07-21 0:54 ` Linus Torvalds
2008-07-21 1:03 ` David Miller
2008-07-21 1:09 ` Alexey Dobriyan
2008-07-21 1:14 ` David Miller
2008-07-21 1:22 ` Alexey Dobriyan
2008-07-21 2:40 ` Alexey Dobriyan
2008-07-21 2:48 ` David Miller
2008-07-21 5:11 ` David Miller
2008-07-21 9:48 ` Alexander Beregalov
2008-07-21 10:16 ` Ben Hutchings
2008-07-21 15:35 ` David Miller
2008-07-21 16:04 ` Alexander Beregalov
2008-07-21 11:57 ` Alexey Dobriyan
2008-07-21 15:27 ` David Miller
2008-07-21 16:49 ` Linus Torvalds
2008-07-21 16:53 ` David Miller
2008-07-21 1:20 ` Patrick McHardy
2008-07-21 11:28 ` Stefan Richter
2008-07-21 11:45 ` James Morris
2008-07-21 12:05 ` Patrick McHardy
2008-07-21 17:28 ` David Miller
2008-07-21 17:40 ` Linus Torvalds
2008-07-21 20:33 ` Patrick McHardy
2008-07-23 23:42 ` David Miller
2008-07-21 1:07 ` Linus Torvalds
2008-07-21 1:17 ` David Miller
2008-07-21 8:36 ` iwlwifi: fix build bug in "iwlwifi: fix LED stall" Ingo Molnar
2008-07-21 10:02 ` Winkler, Tomas
2008-07-21 10:53 ` Ingo Molnar
2008-07-21 12:12 ` [PATCH] iwlwifi: RS small compile warnings without CONFIG_IWLWIFI_DEBUG Tomas Winkler
2008-07-21 12:12 ` [PATCH] iwlwifi: " Tomas Winkler
2008-07-21 12:12 ` [PATCH] iwlwifi: compilation error when CONFIG_IWLWIFI_DEBUG is not set Tomas Winkler
2008-07-21 13:30 ` [crash, bisected] Kernel BUG at ffffffff8079afb1 (__netif_schedule()) Ingo Molnar
2008-07-21 13:45 ` [crash] BUG: unable to handle kernel NULL pointer dereference at 0000000000000370 Ingo Molnar
2008-07-21 14:30 ` Ingo Molnar
2008-07-21 15:04 ` Ingo Molnar
2008-07-21 15:24 ` David Miller
2008-07-21 18:18 ` Ian Schram
2008-07-21 19:06 ` Ingo Molnar
[not found] ` <20080721190646.GA19044-X9Un+BFzKDI@public.gmane.org>
2008-07-21 19:13 ` Larry Finger
[not found] ` <4884DFEE.4060003-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
2008-07-21 19:34 ` Ingo Molnar
[not found] ` <20080721193425.GA29287-X9Un+BFzKDI@public.gmane.org>
2008-07-21 19:43 ` Larry Finger
[not found] ` <4884E6E6.7010800-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
2008-07-21 19:47 ` Linus Torvalds
2008-07-21 20:15 ` David Miller
[not found] ` <alpine.LFD.1.10.0807211246280.31863-5CScLwifNT1QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org>
2008-07-21 20:28 ` Larry Finger
2008-07-21 20:21 ` David Miller
[not found] ` <20080721.132100.128525904.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-21 20:38 ` Larry Finger
2008-07-21 20:46 ` David Miller
2008-07-21 20:51 ` Patrick McHardy
2008-07-21 21:01 ` David Miller
2008-07-21 21:06 ` Patrick McHardy
[not found] ` <4884FA3F.70109-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org>
2008-07-21 21:35 ` Patrick McHardy
[not found] ` <48850121.9090106-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org>
2008-07-21 21:42 ` Patrick McHardy
2008-07-21 21:51 ` Larry Finger
[not found] ` <488504D9.5090100-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
2008-07-21 22:04 ` Patrick McHardy
[not found] ` <488507FB.9050101-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org>
2008-07-21 22:40 ` Larry Finger
[not found] ` <4885104A.2070201-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
2008-07-21 23:15 ` David Miller
2008-07-22 6:34 ` Larry Finger
[not found] ` <48857F74.2040406-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
2008-07-22 10:51 ` Jarek Poplawski
2008-07-22 11:32 ` David Miller
2008-07-22 12:52 ` Larry Finger
2008-07-22 20:43 ` David Miller
2008-07-22 13:02 ` Larry Finger
[not found] ` <4885DA49.50703-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
2008-07-22 14:53 ` Patrick McHardy
[not found] ` <4885F46A.30309-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org>
2008-07-22 21:17 ` David Miller
2008-07-22 16:39 ` Kernel WARNING: at net/core/dev.c:1330 __netif_schedule+0x2c/0x98() Larry Finger
[not found] ` <48860D4B.8070003-tQ5ms3gMjBLk1uMJSBkQmQ@public.gmane.org>
2008-07-22 17:20 ` Patrick McHardy
2008-07-22 18:39 ` Larry Finger
2008-07-22 18:44 ` Patrick McHardy
[not found] ` <48862A76.8030307-dcUjhNyLwpNeoWH0uzbU5w@public.gmane.org>
2008-07-22 19:30 ` Larry Finger
2008-07-22 23:04 ` David Miller
2008-07-23 6:20 ` Jarek Poplawski
2008-07-23 7:59 ` David Miller
[not found] ` <20080723.005921.113868915.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-23 8:54 ` Jarek Poplawski
[not found] ` <20080723085452.GB4561-8HppEYmqbBCE+EvaaNYduQ@public.gmane.org>
2008-07-23 9:03 ` Peter Zijlstra
2008-07-23 9:35 ` Jarek Poplawski
[not found] ` <20080723093459.GC4561-8HppEYmqbBCE+EvaaNYduQ@public.gmane.org>
2008-07-23 9:50 ` Peter Zijlstra
2008-07-23 10:13 ` Jarek Poplawski
2008-07-23 10:58 ` Peter Zijlstra
2008-07-23 11:35 ` Jarek Poplawski
[not found] ` <20080723113519.GE4561-8HppEYmqbBCE+EvaaNYduQ@public.gmane.org>
2008-07-23 11:49 ` Jarek Poplawski
2008-07-23 20:16 ` David Miller
2008-07-23 20:43 ` Jarek Poplawski
[not found] ` <20080723204335.GA14788-dUp/P3zyUuaNj9Bq2fkWzw@public.gmane.org>
2008-07-23 20:55 ` David Miller
[not found] ` <20080723.131607.79681752.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-24 9:10 ` Peter Zijlstra
2008-07-24 9:20 ` David Miller
[not found] ` <20080724.022040.23129457.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-24 9:27 ` Peter Zijlstra
2008-07-24 9:32 ` David Miller
[not found] ` <20080724.023210.229338550.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-24 10:08 ` Peter Zijlstra
2008-07-24 10:38 ` Nick Piggin
[not found] ` <200807242038.36693.nickpiggin-/E1597aS9LT0CCvOHzKKcA@public.gmane.org>
2008-07-24 10:55 ` Miklos Szeredi
[not found] ` <E1KLyUI-0006ZS-Cg-8f8m9JG5TPIdUIPVzhDTVZP2KDSNp7ea@public.gmane.org>
2008-07-24 11:06 ` Nick Piggin
[not found] ` <200807242106.52672.nickpiggin-/E1597aS9LT0CCvOHzKKcA@public.gmane.org>
2008-08-01 21:10 ` Paul E. McKenney
2008-07-24 10:59 ` Peter Zijlstra
2008-08-01 21:10 ` Paul E. McKenney
2008-07-23 20:14 ` David Miller
[not found] ` <20080723.131441.200166513.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-24 7:00 ` Peter Zijlstra
2008-07-25 17:04 ` Ingo Oeser
[not found] ` <200807251904.37302.netdev-BkyiQQGWkgE@public.gmane.org>
2008-07-25 18:36 ` Jarek Poplawski
2008-07-25 19:16 ` Johannes Berg
[not found] ` <1217013384.4758.5.camel-YfaajirXv214zXjbi5bjpg@public.gmane.org>
2008-07-25 19:34 ` Jarek Poplawski
2008-07-25 19:36 ` Johannes Berg
2008-07-25 20:01 ` Jarek Poplawski
[not found] ` <20080725200137.GC3107-dUp/P3zyUuaNj9Bq2fkWzw@public.gmane.org>
2008-07-26 9:18 ` David Miller
2008-07-26 10:53 ` Jarek Poplawski
[not found] ` <20080726.021846.236624483.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-26 13:18 ` Jarek Poplawski
[not found] ` <20080726131838.GA2873-dUp/P3zyUuaNj9Bq2fkWzw@public.gmane.org>
2008-07-27 0:34 ` David Miller
[not found] ` <20080726.173434.48036095.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-27 20:37 ` Jarek Poplawski
[not found] ` <20080727203757.GA2527-dUp/P3zyUuaNj9Bq2fkWzw@public.gmane.org>
2008-07-31 12:29 ` David Miller
[not found] ` <20080731.052932.110299354.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-07-31 12:38 ` Nick Piggin
2008-07-31 12:44 ` David Miller
2008-08-01 4:27 ` David Miller
[not found] ` <20080731.212729.138736823.davem-fT/PcQaiUtIeIZ0/mPfg9Q@public.gmane.org>
2008-08-01 7:09 ` Peter Zijlstra
2008-08-01 6:48 ` Jarek Poplawski
[not found] ` <20080801064810.GA4435-8HppEYmqbBCE+EvaaNYduQ@public.gmane.org>
2008-08-01 7:00 ` David Miller
2008-08-01 7:01 ` Jarek Poplawski
[not found] ` <20080801070150.GB4435-8HppEYmqbBCE+EvaaNYduQ@public.gmane.org>
2008-08-01 7:01 ` David Miller
2008-08-01 7:41 ` Jarek Poplawski
2008-07-25 6:20 ` [lockdep warning] AOE / networking: aoenet_xmit: noop_qdisc.q.lock, INFO: inconsistent lock state at 0000000000000370 Ingo Molnar
2008-07-25 6:25 ` David Miller
2008-07-25 7:26 ` Ingo Molnar
2008-07-25 8:23 ` David Miller
[not found] ` <20080721143023.GA32451-X9Un+BFzKDI@public.gmane.org>
2008-07-21 15:10 ` [crash] BUG: unable to handle kernel NULL pointer dereference " David Miller
2008-07-21 18:23 ` [crash] kernel BUG at net/core/dev.c:1328! Ingo Molnar
2008-07-21 18:35 ` Linus Torvalds
2008-07-21 18:46 ` Ingo Molnar
2008-07-21 19:30 ` Ingo Molnar
2008-07-22 11:21 ` [TCP bug] stuck distcc connections in latest -git Ingo Molnar
2008-07-22 13:45 ` David Newall
2008-07-22 13:57 ` Ingo Molnar
2008-07-22 14:54 ` David Newall
2008-07-22 15:34 ` Ingo Molnar
2008-07-22 21:12 ` Willy Tarreau
2008-07-23 8:26 ` Ingo Molnar
2008-07-24 6:04 ` [TCP bug, regression] " Ingo Molnar
2008-07-24 6:32 ` Ingo Molnar
2008-07-24 7:33 ` Willy Tarreau
2008-07-24 8:35 ` Ingo Molnar
2008-07-24 7:53 ` Herbert Xu
2008-07-24 8:24 ` Willy Tarreau
2008-07-24 8:27 ` Ingo Molnar
2008-07-24 8:36 ` David Miller
2008-07-24 9:05 ` Herbert Xu
2008-07-24 9:22 ` David Miller
2008-07-24 9:34 ` Ingo Molnar
2008-07-24 11:56 ` [regression] nf_iterate(), BUG: unable to handle kernel NULL pointer dereference Ingo Molnar
2008-07-24 11:59 ` Ingo Molnar
2008-07-24 12:03 ` Patrick McHardy
2008-07-24 12:22 ` Herbert Xu
2008-07-24 12:40 ` Pekka Enberg
2008-07-24 12:50 ` Herbert Xu
2008-07-24 12:56 ` Nick Piggin
2008-07-24 13:04 ` Herbert Xu
2008-07-24 13:13 ` Nick Piggin
2008-07-24 13:32 ` Pekka Enberg
2008-07-24 19:21 ` Matt Mackall
2008-07-25 9:09 ` Nick Piggin
2008-07-24 13:11 ` Matt Mackall
2008-07-24 14:37 ` Herbert Xu
2008-07-24 17:47 ` Matt Mackall
2008-07-25 1:39 ` Herbert Xu
2008-07-25 2:59 ` Matt Mackall
2008-07-24 12:44 ` Pekka Enberg
2008-07-24 12:49 ` Patrick McHardy
2008-07-24 13:23 ` Pekka Enberg
2008-07-24 13:31 ` Patrick McHardy
2008-07-24 13:34 ` Pekka Enberg
2008-07-24 18:51 ` Andrew Morton
2008-07-24 18:55 ` Pekka Enberg
2008-07-24 20:58 ` David Miller
2008-07-25 8:02 ` Dieter Ries
2008-07-25 10:41 ` Pekka Enberg
2008-07-24 19:35 ` Ingo Molnar
2008-07-26 16:09 ` Patrick McHardy
2008-07-26 17:34 ` Ingo Molnar
2008-07-26 13:43 ` Patrick McHardy
2008-07-24 21:13 ` Linus Torvalds
2008-07-24 22:09 ` David Miller
2008-07-26 13:47 ` Patrick McHardy
2008-08-01 21:10 ` Paul E. McKenney
2008-07-24 14:23 ` Ingo Molnar
2008-07-24 15:23 ` Patrick McHardy
2008-07-24 15:32 ` Ingo Molnar
2008-07-24 15:34 ` Patrick McHardy
2008-07-24 18:00 ` Krzysztof Oledzki
2008-07-24 13:01 ` [TCP bug, regression] stuck distcc connections in latest -git Willy Tarreau
2008-07-24 9:25 ` Ingo Molnar
2008-07-24 9:29 ` David Miller
2008-07-24 11:12 ` Herbert Xu
2008-07-24 9:36 ` Ilpo Järvinen
2008-07-24 10:03 ` Ilpo Järvinen [this message]
2008-07-21 19:00 ` [crash] kernel BUG at net/core/dev.c:1328! David Miller
2008-07-21 19:20 ` Stefan Richter
2008-07-21 20:11 ` David Miller
2008-07-21 21:26 ` Stefan Richter
2008-07-21 19:44 ` Ingo Molnar
2008-07-21 20:20 ` David Miller
2008-07-21 15:07 ` [crash, bisected] Kernel BUG at ffffffff8079afb1 (__netif_schedule()) David Miller
2008-07-21 13:50 ` [GIT]: Networking Ingo Molnar
2008-07-21 14:15 ` Stefan Richter
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