From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: [PATCH v2] RPS: Sparse connection optimizations - v2 Date: Mon, 07 May 2012 09:22:20 +0200 Message-ID: <1336375340.3752.2242.camel@edumazet-glaptop> References: <1336035412-2161-1-git-send-email-dczhu@mips.com> <4FA35A3D.8000205@mips.com> <1336117669.3752.49.camel@edumazet-glaptop> <4FA770DA.6000104@mips.com> Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: 7bit Cc: Tom Herbert , davem@davemloft.net, netdev@vger.kernel.org To: Deng-Cheng Zhu Return-path: Received: from mail-ey0-f174.google.com ([209.85.215.174]:44712 "EHLO mail-ey0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754141Ab2EGHWZ (ORCPT ); Mon, 7 May 2012 03:22:25 -0400 Received: by eaaq12 with SMTP id q12so1291919eaa.19 for ; Mon, 07 May 2012 00:22:24 -0700 (PDT) In-Reply-To: <4FA770DA.6000104@mips.com> Sender: netdev-owner@vger.kernel.org List-ID: On Mon, 2012-05-07 at 14:51 +0800, Deng-Cheng Zhu wrote: > This is not about arch, it's about system design. Even with IRQ affinity > working, for single queue NICs, RPS still has its value in this test. > Post your numbers when proper affinities are done. Having several cpus fighting on output path for qdisc/device lock is a killer. Extra IPI are not worth the pain.