From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 29 Jan 2001 13:51:07 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 29 Jan 2001 13:50:57 -0500 Received: from palrel1.hp.com ([156.153.255.242]:24837 "HELO palrel1.hp.com") by vger.kernel.org with SMTP id ; Mon, 29 Jan 2001 13:50:54 -0500 Message-ID: <3A75BB81.3423F1B2@cup.hp.com> Date: Mon, 29 Jan 2001 10:50:41 -0800 From: Rick Jones Organization: the Unofficial HP X-Mailer: Mozilla 4.75 [en] (X11; U; HP-UX B.11.00 9000/785) X-Accept-Language: en MIME-Version: 1.0 To: jamal Cc: Andrew Morton , lkml , "netdev@oss.sgi.com" Subject: Re: sendfile+zerocopy: fairly sexy (nothing to do with ECN) In-Reply-To: Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > I'll give this a shot later. Can you try with the sendfiled-ttcp? > http://www.cyberus.ca/~hadi/ttcp-sf.tar.gz I guess I need to "leverage" some bits for netperf :) WRT getting data with links that cannot saturate a system, having something akin to the netperf service demand measure can help. Nothing terribly fancy - simply a conversion of the CPU utilization and throughput to a microseconds of CPU to transfer a KB of data. As for CKO and avoiding copies and such, if past experience is any guide (ftp://ftp.cup.hp.com/dist/networking/briefs/copyavoid.ps) you get a very nice synergistic effect once the last "access" of data is removed. CKO gets you say 10%, avoiding the copy gets you say 10%, but doing both at the same time gets you 30%. rick jones http://www.netperf.org/ -- ftp://ftp.cup.hp.com/dist/networking/misc/rachel/ these opinions are mine, all mine; HP might not want them anyway... :) feel free to email, OR post, but please do NOT do BOTH... my email address is raj in the cup.hp.com domain... - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/