Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263308AbTH0MDn (ORCPT ); Wed, 27 Aug 2003 08:03:43 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263336AbTH0MDn (ORCPT ); Wed, 27 Aug 2003 08:03:43 -0400 Received: from inway106.cdi.cz ([213.151.81.106]:38613 "EHLO luxik.cdi.cz") by vger.kernel.org with ESMTP id S263308AbTH0MDm (ORCPT ); Wed, 27 Aug 2003 08:03:42 -0400 Date: Wed, 27 Aug 2003 14:03:22 +0200 (CEST) From: devik X-X-Sender: To: Subject: 2.4.21 on SMP has extra slow context switch Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 919 Lines: 33 Hello, I upgraded one SMP box (Soyo MB, 2x PII/350, 500MB) from 2.4.8 (really) to 2.4.21 last week. Users start to complaint that it is slow. I run lmbench's context switch measurer and it's result is: "size=0k ovr=5.41 2 169.26 3 111.28 4 83.99 While on very similar UP system (the same CPU & kernel) it is: "size=0k ovr=3.50 2 1.80 3 2.08 4 2.89 Have someone even idea what is going on ? The systems seems to be fairly stable but slooow. I plan to reboot with single CPU at evening and/or upgrade to .22, but the numbers above are weird. thanks, ------------------------------- Martin Devera aka devik Linux kernel QoS/HTB maintainer http://luxik.cdi.cz/~devik/ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/