From: Thomas Jarosch <thomas.jarosch@intra2net•com> To: "Ilpo Järvinen" <ilpo.jarvinen@helsinki•fi> Cc: "Jozsef Kadlecsik" <kadlec@blackhole•kfki.hu>, Netdev <netdev@vger•kernel.org>, "Patrick McHardy" <kaber@trash•net>, "Sven Riedel" <sr@securenet•de>, "Netfilter Developer Mailing List" <netfilter-devel@vger•kernel.org>, "Dâniel Fraga" <fragabr@gmail•com>, "David Miller" <davem@davemloft•net> Subject: Re: TCP connection stalls under 2.6.24.7 Date: Thu, 17 Jul 2008 17:15:14 +0200 [thread overview] Message-ID: <200807171715.16265.thomas.jarosch@intra2net.com> (raw) In-Reply-To: <Pine.LNX.4.64.0807171537560.13775@wrl-59.cs.helsinki.fi> On Thursday, 17. July 2008 15:55:25 Ilpo Järvinen wrote: > It would quite interesting to know more details about the mail server and > why the duplicate ACKs are not generated or don't ever reach the sender > but I guess the details are out of reach? It will be quite difficult to get more details as it's the SMTP relay sever of Germany's biggest ISP. There's a comment about them in Patrick's blog from 2008-06-23 if you are curious ;-) We see the same issue with a MX server from "United Internet". Normally they are pretty accurate about standards (they run GMX), so I guess this must be a problem of a router in between. This is also supported by the fact that 935 of our boxes already updated to kernel 2.6.24.7, yet the problem occured only at three sites and I guess there are more people out there using that SMTP relay server. Could you somehow "probe" the servers to see if they normally send duplicated ACKs by faking/forcing a retransmission? Though I guess this would invole writing some TCP "test" code. > One option would be to disable reentry to FRTO when some progress was > made... Please try with the patch below... Thanks for the patch. It seemed to help a bit. Here are two more traces: http://www.intra2net.com/de/download/tcpdump/tcp_frto_with_patch.tar.bz2 The first connection somehow made it after 400 seconds, the second one stalled and timed out :-( Hope they dumps are useful to you. Chers, Thomas -- To unsubscribe from this list: send the line "unsubscribe netfilter-devel" in the body of a message to majordomo@vger•kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
next prev parent reply other threads:[~2008-07-17 15:15 UTC|newest]
Thread overview: 107+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <47EA0DAB.7080205@securenet.de>
[not found] ` <Pine.LNX.4.64.0807042251500.4142@blackhole.kfki.hu>
[not found] ` <200807071118.32988.thomas.jarosch@intra2net.com>
2008-07-07 13:18 ` TCP connection stalls under 2.6.24.7 Thomas Jarosch
2008-07-10 13:17 ` Jozsef Kadlecsik
2008-07-10 14:12 ` Thomas Jarosch
2008-07-10 21:21 ` Jozsef Kadlecsik
2008-07-11 14:33 ` Thomas Jarosch
2008-07-15 11:47 ` Thomas Jarosch
2008-07-15 16:10 ` Thomas Jarosch
2008-07-15 18:30 ` Dâniel Fraga
2008-07-31 4:47 ` Dâniel Fraga
2008-07-31 7:39 ` Ilpo Järvinen
2008-08-02 12:24 ` Dâniel Fraga
2008-07-15 20:17 ` Ilpo Järvinen
2008-07-16 8:07 ` Thomas Jarosch
2008-07-16 9:03 ` Thomas Jarosch
2008-07-17 13:55 ` Ilpo Järvinen
2008-07-17 15:15 ` Thomas Jarosch [this message]
2008-07-17 15:53 ` Ilpo Järvinen
2008-07-18 9:14 ` Thomas Jarosch
2008-07-18 13:55 ` Ilpo Järvinen
2008-07-18 14:02 ` Thomas Jarosch
2008-07-19 7:35 ` Ilpo Järvinen
2008-07-25 10:00 ` Ilpo Järvinen
2008-07-25 13:00 ` Thomas Jarosch
2008-07-25 14:06 ` Ilpo Järvinen
2008-07-25 15:34 ` Thomas Jarosch
2008-07-31 7:39 ` Thomas Jarosch
2008-07-31 12:44 ` Dâniel Fraga
2008-07-31 13:47 ` Thomas Jarosch
2008-07-31 14:11 ` Dâniel Fraga
2008-08-06 18:53 ` Dâniel Fraga
2008-08-07 6:54 ` Ilpo Järvinen
2008-08-07 11:50 ` Denys Fedoryshchenko
2008-08-07 12:11 ` Thomas Jarosch
2008-08-07 12:14 ` Ilpo Järvinen
2008-08-07 12:23 ` Denys Fedoryshchenko
2008-08-08 9:56 ` Ilpo Järvinen
2008-08-08 10:32 ` Denys Fedoryshchenko
2008-08-07 11:33 ` [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround Ilpo Järvinen
2008-08-08 4:42 ` Bill Fink
2008-08-08 10:32 ` Ilpo Järvinen
2008-08-11 21:44 ` David Miller
2008-08-12 7:46 ` Thomas Jarosch
2008-08-12 8:18 ` David Miller
2008-08-12 17:43 ` Dâniel Fraga
2008-08-12 17:52 ` Ilpo Järvinen
2008-08-13 17:53 ` Dâniel Fraga
2008-08-13 18:34 ` Ilpo Järvinen
2008-08-15 4:34 ` Dâniel Fraga
2008-08-15 7:06 ` Ilpo Järvinen
2008-08-15 21:35 ` Dâniel Fraga
2008-08-15 22:06 ` Ilpo Järvinen
2008-08-15 23:57 ` Dâniel Fraga
2008-08-16 2:15 ` Dâniel Fraga
2008-08-16 7:10 ` Ilpo Järvinen
2008-08-16 19:18 ` Ilpo Järvinen
2008-08-17 0:36 ` Dâniel Fraga
2008-08-19 10:38 ` Ilpo Järvinen
2008-08-20 0:34 ` Dâniel Fraga
2008-08-20 7:57 ` Ilpo Järvinen
2008-08-20 12:37 ` Ilpo Järvinen
2008-08-22 21:32 ` Dâniel Fraga
2008-08-22 21:37 ` David Miller
2008-08-23 14:14 ` Dâniel Fraga
2008-08-23 14:38 ` Ilpo Järvinen
2008-08-24 19:38 ` Dâniel Fraga
2008-08-26 14:10 ` Ilpo Järvinen
2008-08-26 14:32 ` Ilpo Järvinen
2008-08-26 17:18 ` Dâniel Fraga
2008-08-26 20:40 ` Ilpo Järvinen
2008-08-26 21:17 ` Dâniel Fraga
2008-08-27 10:22 ` Ilpo Järvinen
2008-08-27 19:51 ` Dâniel Fraga
2008-08-27 20:32 ` Ilpo Järvinen
2008-08-27 20:50 ` Dâniel Fraga
2008-08-27 21:25 ` Ilpo Järvinen
2008-08-27 21:42 ` Dâniel Fraga
2008-08-27 22:24 ` Dâniel Fraga
2008-08-28 21:49 ` Dâniel Fraga
2008-08-29 13:07 ` Ilpo Järvinen
2008-08-29 17:41 ` Dâniel Fraga
2008-09-01 7:11 ` Ilpo Järvinen
2008-08-30 6:56 ` Dâniel Fraga
2008-09-01 7:11 ` Ilpo Järvinen
2008-09-07 8:17 ` Dâniel Fraga
2008-09-08 10:27 ` Ilpo Järvinen
2008-09-08 20:20 ` Dâniel Fraga
2008-09-11 13:44 ` Ilpo Järvinen
2008-09-11 17:30 ` Dâniel Fraga
2008-09-12 10:16 ` Ilpo Järvinen
2008-09-13 23:31 ` Dâniel Fraga
2008-09-16 12:10 ` Ilpo Järvinen
2008-09-16 14:24 ` Dâniel Fraga
2008-09-17 10:23 ` Ilpo Järvinen
2008-09-18 20:35 ` Dâniel Fraga
2008-09-18 21:04 ` Ilpo Järvinen
2008-09-21 3:02 ` Dâniel Fraga
2008-09-22 4:23 ` Dâniel Fraga
2008-09-22 11:22 ` Ilpo Järvinen
2008-09-22 16:13 ` Dâniel Fraga
2008-09-15 19:42 ` Dâniel Fraga
2008-09-11 18:12 ` Dâniel Fraga
2008-08-15 21:59 ` Dâniel Fraga
2008-08-13 8:00 ` Thomas Jarosch
2008-08-22 21:18 ` Ilpo Järvinen
2008-08-11 21:41 ` David Miller
[not found] <200807101146.26034.thomas.jarosch@intra2net.com>
2008-07-10 10:51 ` TCP connection stalls under 2.6.24.7 Thomas Jarosch
2008-07-10 22:20 ` Dâniel Fraga
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