From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751056AbVHUPrE (ORCPT ); Sun, 21 Aug 2005 11:47:04 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751061AbVHUPrE (ORCPT ); Sun, 21 Aug 2005 11:47:04 -0400 Received: from web33303.mail.mud.yahoo.com ([68.142.206.118]:56236 "HELO web33303.mail.mud.yahoo.com") by vger.kernel.org with SMTP id S1751056AbVHUPrB (ORCPT ); Sun, 21 Aug 2005 11:47:01 -0400 DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com; h=Message-ID:Received:Date:From:Reply-To:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding; b=BwuQoHUzfBGgV5+koRcKx0bPOYZHBK17gDAl702stw3u3B6xoCui1N/D4iBCLqVYN5V66QFi101bEoY1pDyJ2NJDSUbv4OImVTxz9Wzpf3UpJ2mJS3eFRT3sskpDv+/QIbcyHU69yYA1BRRF/4umxSPylZVjI0EYY9KUFxCS/34= ; Message-ID: <20050821154654.63788.qmail@web33303.mail.mud.yahoo.com> Date: Sun, 21 Aug 2005 08:46:54 -0700 (PDT) From: Danial Thom Reply-To: danial_thom@yahoo.com Subject: 2.6.12 Performance problems To: linux-kernel@vger.kernel.org MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org I just started fiddling with 2.6.12, and there seems to be a big drop-off in performance from 2.4.x in terms of networking on a uniprocessor system. Just bridging packets through the machine, 2.6.12 starts dropping packets at ~100Kpps, whereas 2.4.x doesn't start dropping until over 350Kpps on the same hardware (2.0Ghz Opteron with e1000 driver). This is pitiful prformance for this hardware. I've increased the rx ring in the e1000 driver to 512 with little change (interrupt moderation is set to 8000 Ints/second). Has "tuning" for MP destroyed UP performance altogether, or is there some tuning parameter that could make a 4-fold difference? All debugging is off and there are no messages on the console or in the error logs. The kernel is the standard kernel.org dowload config with SMP turned off and the intel ethernet card drivers as modules without any other changes, which is exactly the config for my 2.4 kernels. Danial ____________________________________________________ Start your day with Yahoo! - make it your home page http://www.yahoo.com/r/hs