From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andi Kleen Subject: Re: bad TSO performance in 2.6.9-rc2-BK Date: Thu, 23 Sep 2004 00:47:32 +0200 Sender: netdev-bounce@oss.sgi.com Message-ID: <20040922224732.GD2619@wotan.suse.de> References: <20040920063012.GL2825@krispykreme> <20040920203021.GD4242@wotan.suse.de> <20040921155835.18aee381.davem@davemloft.net> <20040922140000.GD27432@wotan.suse.de> <20040922111209.7887df53.davem@davemloft.net> <20040922195515.GA2619@wotan.suse.de> <20040922133906.7d57ef49.davem@davemloft.net> <20040922220628.GC2619@wotan.suse.de> <20040922152535.7bc81c8a.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: Andi Kleen , andy.grover@gmail.com, anton@samba.org, netdev@oss.sgi.com Return-path: To: "David S. Miller" Content-Disposition: inline In-Reply-To: <20040922152535.7bc81c8a.davem@davemloft.net> Errors-to: netdev-bounce@oss.sgi.com List-Id: netdev.vger.kernel.org On Wed, Sep 22, 2004 at 03:25:35PM -0700, David S. Miller wrote: > On Thu, 23 Sep 2004 00:06:28 +0200 > Andi Kleen wrote: > > > > One thing that could be biting us is the nagle check which > > > probably needs to be adjusted to use the standard MSS not > > > the TSO one... perhaps play with this patch: > > > > I tried it and it breaks the performance completely > > (21MB/s) > > You said you were getting 22MB/sec before the change, right? 22-23MB/s, but not 21MB/s. Ok "breaks completely" was a bit of overstatement, admitted. -Andi