Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932167AbYAaRgr (ORCPT ); Thu, 31 Jan 2008 12:36:47 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1757920AbYAaRgf (ORCPT ); Thu, 31 Jan 2008 12:36:35 -0500 Received: from elasmtp-curtail.atl.sa.earthlink.net ([209.86.89.64]:58981 "EHLO elasmtp-curtail.atl.sa.earthlink.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751592AbYAaRge (ORCPT ); Thu, 31 Jan 2008 12:36:34 -0500 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=dk20050327; d=mindspring.com; b=KyZuxkWNPPPtwDdD7ofDNoiWXS8W2gWGviATOmFXWSTslrnNdtVymodc4pULvx4b; h=Received:Date:From:To:Cc:Subject:Message-Id:In-Reply-To:References:X-Mailer:Mime-Version:Content-Type:Content-Transfer-Encoding:X-ELNK-Trace:X-Originating-IP; Date: Thu, 31 Jan 2008 12:36:27 -0500 From: Bill Fink To: Bruce Allen Cc: SANGTAE HA , Linux Kernel Mailing List , netdev@vger.kernel.org, Stephen Hemminger Subject: Re: e1000 full-duplex TCP performance well below wire speed Message-Id: <20080131123627.599be68f.billfink@mindspring.com> In-Reply-To: References: <20080130.055333.192844925.davem@davemloft.net> <20080130082136.1017631d@deepthought> <649aecc70801301617m6331bcb8i8ce60366e182c739@mail.gmail.com> <20080131064533.ef0ae932.billfink@mindspring.com> X-Mailer: Sylpheed version 2.2.7 (GTK+ 2.8.6; powerpc-yellowdog-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-ELNK-Trace: c598f748b88b6fd49c7f779228e2f6aeda0071232e20db4d362fef374961ea41e0b9370f2468fb2c350badd9bab72f9c350badd9bab72f9c350badd9bab72f9c X-Originating-IP: 68.55.21.22 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1043 Lines: 24 Hi Bruce, On Thu, 31 Jan 2008, Bruce Allen wrote: > > I see similar results on my test systems > > Thanks for this report and for confirming our observations. Could you > please confirm that a single-port bidrectional UDP link runs at wire > speed? This helps to localize the problem to the TCP stack or interaction > of the TCP stack with the e1000 driver and hardware. Yes, a single-port bidirectional UDP test gets full GigE line rate in both directions with no packet loss. [bill@chance4 ~]$ nuttcp -f-beta -Itx -u -Ru -w2m 192.168.6.79 & nuttcp -f-beta -Irx -r -u -Ru -w2m 192.168.6.79 tx: 1187.0078 MB / 10.04 sec = 992.0550 Mbps 19 %TX 7 %RX 0 / 151937 drop/pkt 0.00 %loss rx: 1187.1016 MB / 10.03 sec = 992.3408 Mbps 19 %TX 7 %RX 0 / 151949 drop/pkt 0.00 %loss -Bill -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/