From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: Re: Re: limited network bandwidth with 3.2.x kernels Date: Tue, 14 Feb 2012 00:14:46 +0100 Message-ID: <1329174886.2523.16.camel@edumazet-laptop> References: <8633039.fHPLx6GNq3@localhost.localdomain> <1329173056.2523.14.camel@edumazet-laptop> <1486820.tZrzp7eZ2l@localhost.localdomain> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: Neal Cardwell , netdev@vger.kernel.org To: alekcejk@googlemail.com Return-path: Received: from mail-ww0-f44.google.com ([74.125.82.44]:55258 "EHLO mail-ww0-f44.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754891Ab2BMXOu (ORCPT ); Mon, 13 Feb 2012 18:14:50 -0500 Received: by wgbdt10 with SMTP id dt10so5342818wgb.1 for ; Mon, 13 Feb 2012 15:14:49 -0800 (PST) In-Reply-To: <1486820.tZrzp7eZ2l@localhost.localdomain> Sender: netdev-owner@vger.kernel.org List-ID: Le mardi 14 f=C3=A9vrier 2012 =C3=A0 01:09 +0200, alekcejk@googlemail.c= om a =C3=A9crit : > =D0=92 =D1=81=D0=BE=D0=BE=D0=B1=D1=89=D0=B5=D0=BD=D0=B8=D0=B8 =D0=BE=D1= =82 =D0=9F=D0=BE=D0=BD=D0=B5=D0=B4=D0=B5=D0=BB=D1=8C=D0=BD=D0=B8=D0=BA = 13 =D1=84=D0=B5=D0=B2=D1=80=D0=B0=D0=BB=D1=8F 2012 17:51:20 =D0=B2=D1=8B= =D0=BD=D0=B0=D0=BF=D0=B8=D1=81=D0=B0=D0=BB=D0=B8: > > Hi, > >=20 > > Could you also please post a tcpdump of a "good" transfer on a 3.1.= x > > kernel to the same server? It would be nice to make sure the option= s > > and advertised windows are the same in both cases. > >=20 > > neal >=20 > Hi, >=20 > Here tcpdump for 3.1.10 kernel (2.6.41.10-3.fc15.i686): >=20 > tcpdump: verbose output suppressed, use -v or -vv for full protocol d= ecode > listening on eth0, link-type EN10MB (Ethernet), capture size 65535 by= tes > 01:03:59.499533 IP 213.83.42.56.60216 > AA.BB.CC.XY.50925: Flags [.],= seq 1015030570:1015032018, ack 3902015221, win 46, options [nop,nop,TS= val 3724352664 ecr 4211303], length 1448 > 01:03:59.499655 IP 213.83.42.56.60216 > AA.BB.CC.XY.50925: Flags [.],= seq 1448:2896, ack 1, win 46, options [nop,nop,TS val 3724352664 ecr 4= 211303], length 1448 > 01:03:59.499665 IP AA.BB.CC.XY.50925 > 213.83.42.56.60216: Flags [.],= ack 2896, win 41449, options [nop,nop,TS val 4211360 ecr 3724352664], = length 0 > 01:03:59.499778 IP 213.83.42.56.60216 > AA.BB.CC.XY.50925: Flags [.],= seq 2896:4344, ack 1, win 46, options [nop,nop,TS val 3724352664 ecr 4= 211303], length 1448 Hmm, we miss the first messages (SYN & SYNACK) to check what was negociated.