From mboxrd@z Thu Jan 1 00:00:00 1970 From: =?ISO-8859-1?Q?D=E2niel?= Fraga Subject: Re: [PATCH] tcp FRTO: in-order-only "TCP proxy" fragility workaround Date: Fri, 22 Aug 2008 18:32:24 -0300 Message-ID: <20080822183224.2d52f16c@tux> References: <20080811.144421.234396007.davem@davemloft.net> <200808120946.19459.thomas.jarosch@intra2net.com> <20080812.011822.155249871.davem@davemloft.net> <20080812144309.7d62fd86@tux> <20080813145310.0c1e534c@tux> <20080815013407.4a594288@tux> <20080815183511.1c81be23@tux> <20080815231538.7999c017@tux> <20080816213615.689ddf8f@tux> <20080819213417.45133573@tux> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: David Miller , thomas.jarosch@intra2net.com, billfink@mindspring.com, Netdev , Patrick Hardy , netfilter-devel@vger.kernel.org, kadlec@blackhole.kfki.hu To: "Ilpo =?ISO-8859-1?Q?J=E4rvinen?=" Return-path: In-Reply-To: Sender: netfilter-devel-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Wed, 20 Aug 2008 15:37:13 +0300 (EEST) "Ilpo J=E4rvinen" wrote: > Based on irc discussion with davem, there is a htb bug which can caus= e=20 > corruption of the retransmitted TCP packets (and then a discard due t= o=20 > checksum mismatch). That would also explain the strange headers I not= iced=20 > earlier. There's a patch below (should apply to 2.6.26), please put i= t at=20 > least on the host(s) which use htb (I don't know if both server and t= he=20 > client do use wondershaper script or just the client). An different=20 > failure symptoms (one could be somehow frto related as FRTO is used w= hile=20 > retransmitting) are also quite well explainable. >=20 > But FRTO is mostly not a suspect based on the tcpdump you provided (n= o=20 > FRTO workaround would help in that). Ilpo, I have good news. I decided to disable completely HTB and the problem seems to have gone. And frto is enabled, of course. So the problem was with HTB, not frto as I thought. The HTB patches you provided are going to be included in the next 2.6.27 kernel, right? Thank you. --=20 -- To unsubscribe from this list: send the line "unsubscribe netfilter-dev= el" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html