From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932753AbXBWU5U (ORCPT ); Fri, 23 Feb 2007 15:57:20 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932767AbXBWU5U (ORCPT ); Fri, 23 Feb 2007 15:57:20 -0500 Received: from mail.astral.ro ([193.230.240.11]:60216 "EHLO mail.astral.ro" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932753AbXBWU5U (ORCPT ); Fri, 23 Feb 2007 15:57:20 -0500 Message-ID: <45DF552C.6070702@astral.ro> Date: Fri, 23 Feb 2007 22:57:16 +0200 From: Gergely Imre User-Agent: Thunderbird 1.5.0.9 (X11/20070212) MIME-Version: 1.0 To: Arjan van de Ven CC: linux-kernel@vger.kernel.org, hancockr@shaw.ca Subject: Re: irq balancing question References: <45DED0D6.1040700@astral.ro> <1172241917.3241.4.camel@laptopd505.fenrus.org> <45DF012D.3080802@astral.ro> <1172246085.3241.24.camel@laptopd505.fenrus.org> <45DF3795.3040005@astral.ro> <1172257289.3241.48.camel@laptopd505.fenrus.org> In-Reply-To: <1172257289.3241.48.camel@laptopd505.fenrus.org> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Arjan van de Ven wrote: >> and i guess it doesn't matter if the distribution is being done by the >> hardware, from the point of view of the kernel, i would still get the >> performance penalty. > > for the cache bouncing you save assuming you have an Intel cpu (eg one > where the cache is shared). You don't save on the cross-cpu reassembly, > that is an entire different algorithm path you hit there.. > > > >> i'm just trying to figure it out, i have no real knowledge of the inner >> kernel workings, so i dont know. but i really would like to use all 4 cores. >> just how expensive is that reassembly path ? > > depends on your traffic to be honest, probably a question more suited > for net-dev list. > i'll look into it, thanks a lot for the comments.