Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262464AbTFBPfk (ORCPT ); Mon, 2 Jun 2003 11:35:40 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262482AbTFBPfj (ORCPT ); Mon, 2 Jun 2003 11:35:39 -0400 Received: from flamingo.mail.pas.earthlink.net ([207.217.120.232]:36233 "EHLO flamingo.mail.pas.earthlink.net") by vger.kernel.org with ESMTP id S262464AbTFBPfj (ORCPT ); Mon, 2 Jun 2003 11:35:39 -0400 Subject: Re: Strange load issues with 2.5.69/70 in both -mm and -bk trees. From: Tom Sightler To: Ingo Molnar Cc: Mike Galbraith , Andrew Morton , LKML In-Reply-To: <1054567498.3545.18.camel@iso-8590-lx.zeusinc.com> References: <1054564236.4190.15.camel@iso-8590-lx.zeusinc.com> <1054567498.3545.18.camel@iso-8590-lx.zeusinc.com> Content-Type: text/plain Organization: Message-Id: <1054568875.3545.34.camel@iso-8590-lx.zeusinc.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.2 (1.2.2-5) Date: 02 Jun 2003 11:47:56 -0400 Content-Transfer-Encoding: 7bit X-MailScanner: Found to be clean X-MailScanner-SpamCheck: not spam, SpamAssassin (score=-3.4, required 10, AWL, EMAIL_ATTRIBUTION, IN_REP_TO, REFERENCES, SPAM_PHRASE_00_01) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1317 Lines: 30 On Mon, 2003-06-02 at 11:24, Tom Sightler wrote: > I'm not sure why it's worse > under 2.5 though, I still wonder if maybe it's because it's getting a > priority boost, it almost seems it should get a penalty for being a CPU > hog as Ingo pointed out. I can easily fix this in userspace so maybe > this is a non-issue. If so, I apologize for bringing it to the list. In trying to figure out why this might be worse under 2.5 I took some simple vmstat numbers under 2.4 and 2.5, this biggest difference is the number of context switches. Under 2.4, with the page loaded, but otherwise idle, the system averages around 700/sec, and when I mouse around the page I get 2000-3000/sec. However, under 2.5, as I reported previously, I get 2000/sec all the time, and 3000-4000 as I mouse around the page. Would this be expected behavior? Does 2.5 do something that would cause more context switches that 2.4? I have no idea if this would have any impact at all, but it was the only difference I could observe in my fairly simple testing of the two kernels. Later, Tom - 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/