From mboxrd@z Thu Jan 1 00:00:00 1970 From: Stephen Hemminger Subject: Re: tcp bw in 2.6 Date: Tue, 2 Oct 2007 10:54:23 -0700 Message-ID: <20071002105423.5d61a727@freepuppy.rosehill> References: <20071002005917.GB5480@bitmover.com> <20071002150935.GC17418@bitmover.com> <20071002154137.GD17418@bitmover.com> <4702766E.80202@candelatech.com> <20071002171154.GM17418@bitmover.com> <47027D80.4070506@candelatech.com> <20071002172155.GP17418@bitmover.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: Ben Greear , lm@bitmover.com, Herbert Xu , torvalds@linux-foundation.org, davem@davemloft.net, wscott@bitmover.com, netdev@vger.kernel.org To: lm@bitmover.com (Larry McVoy) Return-path: Received: from smtp2.linux-foundation.org ([207.189.120.14]:36355 "EHLO smtp2.linux-foundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753656AbXJBR4H (ORCPT ); Tue, 2 Oct 2007 13:56:07 -0400 In-Reply-To: <20071002172155.GP17418@bitmover.com> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org On Tue, 2 Oct 2007 10:21:55 -0700 lm@bitmover.com (Larry McVoy) wrote: > > I'm currently on 2.6.20, and have also tried 10gbe nics on 2.6.23 with > > My guess is that it is a bug in the debian 2.6.18 kernel. > > > Have you tried something like ttcp, iperf, or even regular ftp? > > Yeah, I've factored out the code since BitKeeper, my test program, > and John's test program all exhibit the same behaviour. Also switched > switches. > > > Checked your nics to make sure they have no errors and are negotiated > > to full duplex? > > Yup and yup. Make sure you don't have slab debugging turned on. It kills performance. -- Stephen Hemminger