From mboxrd@z Thu Jan 1 00:00:00 1970 From: Rick Jones Subject: Re: tcp bw in 2.6 Date: Tue, 02 Oct 2007 15:17:35 -0700 Message-ID: <4702C37F.4030601@hp.com> References: <20071002164858.GH17418@bitmover.com> <20071002.141656.42880006.davem@davemloft.net> <20071002212608.GG29944@bitmover.com> <20071002.144709.123999983.davem@davemloft.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Cc: lm@bitmover.com, torvalds@linux-foundation.org, herbert@gondor.apana.org.au, wscott@bitmover.com, netdev@vger.kernel.org To: David Miller Return-path: Received: from palrel10.hp.com ([156.153.255.245]:37113 "EHLO palrel10.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753146AbXJBWRh (ORCPT ); Tue, 2 Oct 2007 18:17:37 -0400 In-Reply-To: <20071002.144709.123999983.davem@davemloft.net> Sender: netdev-owner@vger.kernel.org List-Id: netdev.vger.kernel.org David Miller wrote: > From: lm@bitmover.com (Larry McVoy) > Date: Tue, 2 Oct 2007 14:26:08 -0700 > > >>And note that sky2 doesn't have this problem. Does the broadcom do TSO? >>And sky2 not? I noticed a much higher CPU load for sky2. > > > Yes the broadcoms (the revisions I have) do TSO and it is enabled > on both sides. > > Which makes the mis-matched performance even stranger :) Stranger still, with a mix of a 2.6.23-rc5ish kernel and a net-2.6.24 one (pulled oh middle of last week?) I get link-rate and I see no asymmetry between TCP_STREAM and TCP_MAERTS over an "e1000" link with no switch or tg3 with a ProCurve on my rx2660's. I can also run bw_tcp from lmbench 3.0a8 and get 106 MB/s. I don't have a netgear switch to try in all this... rick jones