From mboxrd@z Thu Jan 1 00:00:00 1970 From: jamal Subject: Re: rps perfomance WAS(Re: rps: question Date: Thu, 15 Apr 2010 08:10:28 -0400 Message-ID: <1271333428.23780.3.camel@bigi> References: <1265568122.3688.36.camel@bigi> <65634d661002072158r48ec15cag1ca58e704114a358@mail.gmail.com> <1265641748.3688.56.camel@bigi> <1271245986.3943.55.camel@bigi> <1271268242.16881.1719.camel@edumazet-laptop> <1271271222.4567.51.camel@bigi> <20100414124426.6aee95c3@nehalam> <1271276568.4567.59.camel@bigi> <1271276855.16881.1756.camel@edumazet-laptop> <1271278661.16881.1761.camel@edumazet-laptop> Reply-To: hadi@cyberus.ca Mime-Version: 1.0 Content-Type: text/plain Content-Transfer-Encoding: 7bit Cc: Tom Herbert , Stephen Hemminger , netdev@vger.kernel.org, robert@herjulf.net, David Miller , Changli Gao , Andi Kleen To: Eric Dumazet Return-path: Received: from mail-qy0-f189.google.com ([209.85.221.189]:43358 "EHLO mail-qy0-f189.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753136Ab0DOMKg (ORCPT ); Thu, 15 Apr 2010 08:10:36 -0400 Received: by qyk27 with SMTP id 27so1545446qyk.23 for ; Thu, 15 Apr 2010 05:10:35 -0700 (PDT) In-Reply-To: <1271278661.16881.1761.camel@edumazet-laptop> Sender: netdev-owner@vger.kernel.org List-ID: On Wed, 2010-04-14 at 22:57 +0200, Eric Dumazet wrote: > On my Nehalem machine (16 logical cpus), its NetXtreme II BCM57711E > 10Gigabit has 16 queues. It might be good to use less queues according > to your results on some workloads, and eventually use RPS on a second > layering. Ok Eric, you seem to be running a system with two Nehalems interconnected by QPI. Is there any difference, performance-wise, between redirecting from coreX to coreY when they are on the same Nehalem vs when you are going across QPI? cheers, jamal