Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753727AbZCNNU0 (ORCPT ); Sat, 14 Mar 2009 09:20:26 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751989AbZCNNUI (ORCPT ); Sat, 14 Mar 2009 09:20:08 -0400 Received: from rhun.apana.org.au ([64.62.148.172]:60282 "EHLO arnor.apana.org.au" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751674AbZCNNUH (ORCPT ); Sat, 14 Mar 2009 09:20:07 -0400 Date: Sat, 14 Mar 2009 21:19:51 +0800 From: Herbert Xu To: David Miller Cc: therbert@google.com, yanmin_zhang@linux.intel.com, bhutchings@solarflare.com, andi@firstfloor.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org, jesse.brandeburg@intel.com, shemminger@vyatta.com Subject: Re: [RFC v2: Patch 1/3] net: hand off skb list to other cpu to submit to upper layer Message-ID: <20090314131951.GA6080@gondor.apana.org.au> References: <65634d660903131459m645eb468y3ad850a1fd56d447@mail.gmail.com> <20090313.151913.21135937.davem@davemloft.net> <65634d660903131724s49009177pdc11005aa76a4b56@mail.gmail.com> <20090313.191951.228619450.davem@davemloft.net> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090313.191951.228619450.davem@davemloft.net> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1067 Lines: 26 On Fri, Mar 13, 2009 at 07:19:51PM -0700, David Miller wrote: > From: Tom Herbert > Date: Fri, 13 Mar 2009 17:24:10 -0700 > > > Enabling HW multi-queue has somewhat higher CPU > > utilization though, the extra device interrupt load is not coming for > > free. We actually use the HW multi-queue in conjunction with our > > software steering to get maximum pps (about 20% more). > > This is a non-intuitive observation. Using HW multiqueue should be > cheaper than doing it in software, right? Shared caches can play games with the numbers, we need to look at this a bit more. Cheers, -- Visit Openswan at http://www.openswan.org/ Email: Herbert Xu ~{PmV>HI~} Home Page: http://gondor.apana.org.au/~herbert/ PGP Key: http://gondor.apana.org.au/~herbert/pubkey.txt -- 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/