From mboxrd@z Thu Jan 1 00:00:00 1970 From: Wenji Wu Subject: RE: A Linux TCP SACK Question Date: Fri, 04 Apr 2008 17:14:02 -0500 Message-ID: <000f01c896a1$3022fec0$c95ee183@D2GT6T71> References: <1e41a3230804040927j3ce53a84u6a95ec37dff1b5b0@mail.gmail.com> <000001c8967c$496efa20$c95ee183@D2GT6T71> <000b01c89699$00e99590$c95ee183@D2GT6T71> Reply-To: wenji@fnal.gov Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 7BIT Cc: 'John Heffner' , 'Netdev' To: =?iso-8859-1?Q?'Ilpo_J=E4rvinen'?= Return-path: Received: from mailgw2.fnal.gov ([131.225.111.12]:39512 "EHLO mailgw2.fnal.gov" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751941AbYDDWRv (ORCPT ); Fri, 4 Apr 2008 18:17:51 -0400 Received: from mailav2.fnal.gov (mailav2.fnal.gov [131.225.111.20]) by mailgw2.fnal.gov (iPlanet Messaging Server 5.2 HotFix 2.06 (built Mar 28 2005)) with SMTP id <0JYT00FMVMRD28@mailgw2.fnal.gov> for netdev@vger.kernel.org; Fri, 04 Apr 2008 17:14:09 -0500 (CDT) Received: from mailgw2.fnal.gov ([131.225.111.12]) by mailav2.fnal.gov (SAVSMTP 3.1.7.47) with SMTP id M2008040417140910834 for ; Fri, 04 Apr 2008 17:14:09 -0500 Received: from conversion-daemon.mailgw2.fnal.gov by mailgw2.fnal.gov (iPlanet Messaging Server 5.2 HotFix 2.06 (built Mar 28 2005)) id <0JYT00D01N2TO6@mailgw2.fnal.gov> (original mail from wenji@fnal.gov) for netdev@vger.kernel.org; Fri, 04 Apr 2008 17:14:09 -0500 (CDT) In-reply-to: Sender: netdev-owner@vger.kernel.org List-ID: >...Assuming it wasn't disabled already. If you find that there's >significant difference, you could try also with SACK+basic FRTO (set >the tcp_frto sysctl to 1). No, still the same. I tried tcp_frto with 0, 1, 2. SACK On is worse than SACK off. wenji