From mboxrd@z Thu Jan 1 00:00:00 1970 From: Eric Dumazet Subject: Re: Multicast packet loss Date: Fri, 30 Jan 2009 23:41:23 +0100 Message-ID: <49838213.90700@cosmosbay.com> References: <49833DBC.7040607@athenacr.com> <20090130200330.GA12659@hmsreliant.think-freely.org> <49837F56.2020502@athenacr.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: netdev@vger.kernel.org To: Kenny Chang Return-path: Received: from gw1.cosmosbay.com ([212.99.114.194]:38504 "EHLO gw1.cosmosbay.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752898AbZA3Woh convert rfc822-to-8bit (ORCPT ); Fri, 30 Jan 2009 17:44:37 -0500 In-Reply-To: <49837F56.2020502@athenacr.com> Sender: netdev-owner@vger.kernel.org List-ID: Kenny Chang a =E9crit : > Ah, sorry, here's the test program attached. >=20 > We've tried 2.6.28.1, but no, we haven't tried the 2.6.28.2 or the > 2.6.29.-rcX. >=20 > Right now, we are trying to step through the kernel versions until we > see where the performance drops significantly. We'll try 2.6.29-rc s= oon > and post the result. 2.6.29-rc contains UDP receive improvements (lockless) Problem is multicast handling was not yet updated, but could be :) I was asking you "cat /proc/interrupts" because I believe you might have a problem NIC interrupts being handled by one CPU only (when havin= g problems)