From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753490Ab1HIMEH (ORCPT ); Tue, 9 Aug 2011 08:04:07 -0400 Received: from mail-iy0-f170.google.com ([209.85.210.170]:34261 "EHLO mail-iy0-f170.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753232Ab1HIMEF (ORCPT ); Tue, 9 Aug 2011 08:04:05 -0400 Message-ID: <4E41222B.8060003@gmail.com> Date: Tue, 09 Aug 2011 21:03:55 +0900 From: "J.Hwan Kim" User-Agent: Mozilla/5.0 (X11; U; Linux x86_64; en-US; rv:1.9.2.18) Gecko/20110617 Thunderbird/3.1.11 MIME-Version: 1.0 To: linux-kernel@vger.kernel.org Subject: RSS mode performance in ixgbe (82599) driver Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, everyone I'm testing the RSS mode throughput of Intel ixgbe 82599 driver. My server's specification is Xeon 3GHz (4cores) and PCIe speed is 2.5Gx8lanes, and DD2 memory is about 600~700MHz. When I enable the RSS(receive side scaling) mode with 4 Rx queues, the Rx performance is below than when I use a single queue. I don't know how the cores operate, whether the cores run in sequence or simultaneously at the same time. I want to know the mechanism in general how the multi-cores run and the reason why the performance of ixgbe driver in rss mode is below non-rss mode. Thanks in advance. Best Regards, J.Hwan Kim