From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Sat, 22 Mar 2003 01:24:18 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Sat, 22 Mar 2003 01:24:18 -0500 Received: from willy.net1.nerim.net ([62.212.114.60]:49415 "EHLO www.home.local") by vger.kernel.org with ESMTP id ; Sat, 22 Mar 2003 01:24:17 -0500 Date: Sat, 22 Mar 2003 07:30:38 +0100 From: Willy Tarreau To: Mel Gorman Cc: Linux Kernel Mailing List Subject: Re: Poor performance with pcnet32 on SMP Message-ID: <20030322063038.GB26167@alpha.home.local> References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.4i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Hello, > I have being noticing some seriously poor network performance with SMP > enabled. The machine is a xSeries 350 with quad xeon procesors. Under UP, > I get decent transfer rates but with SMP enabled, it won't get over 2kB/s. > I tried binding interrupts to one processor with I've already had problems with pcnet32 (but they were 79c971). Basically, connected to a 100 full-duplex, they would suddenly switch back to half duplex under heavy load, and then I got very very low speeds of course. Since yours works in UP, this may not be related to the same problem, but who knows ? I see in your dmesg that the card is connected to a 10 half link. Have you tried a 100 Mbps just in case ? Regards, Willy