From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Miller Subject: Re: [RFC] [PATCH] Optimize TCP sendmsg in favour of fast devices? Date: Fri, 15 Jan 2010 01:18:29 -0800 (PST) Message-ID: <20100115.011829.03057807.davem@davemloft.net> References: <20100115.003636.199394610.davem@davemloft.net> Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: eric.dumazet@gmail.com, ilpo.jarvinen@helsinki.fi, netdev@vger.kernel.org To: krkumar2@in.ibm.com Return-path: Received: from 74-93-104-97-Washington.hfc.comcastbusiness.net ([74.93.104.97]:51108 "EHLO sunset.davemloft.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755659Ab0AOJSU (ORCPT ); Fri, 15 Jan 2010 04:18:20 -0500 In-Reply-To: Sender: netdev-owner@vger.kernel.org List-ID: From: Krishna Kumar2 Date: Fri, 15 Jan 2010 14:50:04 +0530 > I wonder if there is some other way to test it. I could test it on > the card I have, cxgbe, by ethtool F_SG off, and then testing > this patch with existing code (both with ethtool F_SG off)? Will > that be enough to get an idea, or I cannot assume this is > reasonable for real non-sg drivers? I am sure there is a > degradation, and mentioned that part as a "penalty" for those > drivers in my patch. I think such a test would provide useful data by which to judge this change.