From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 18 Nov 2002 15:13:39 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 18 Nov 2002 15:13:39 -0500 Received: from holomorphy.com ([66.224.33.161]:481 "EHLO holomorphy") by vger.kernel.org with ESMTP id ; Mon, 18 Nov 2002 15:13:39 -0500 Date: Mon, 18 Nov 2002 12:17:48 -0800 From: William Lee Irwin III To: Dave Hansen Cc: "Martin J. Bligh" , linux-kernel@vger.kernel.org, mingo@elte.hu, rml@tech9.net, riel@surriel.com, akpm@zip.com.au Subject: Re: unusual scheduling performance Message-ID: <20021118201748.GL23425@holomorphy.com> Mail-Followup-To: William Lee Irwin III , Dave Hansen , "Martin J. Bligh" , linux-kernel@vger.kernel.org, mingo@elte.hu, rml@tech9.net, riel@surriel.com, akpm@zip.com.au References: <20021118081854.GJ23425@holomorphy.com> <705474709.1037608454@[10.10.2.3]> <20021118165316.GK23425@holomorphy.com> <3DD92914.1060301@us.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <3DD92914.1060301@us.ibm.com> User-Agent: Mutt/1.3.25i Organization: The Domain of Holomorphy Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Mon, Nov 18, 2002 at 09:53:24AM -0800, Dave Hansen wrote: > I'm seeing the same thing. In my pagecache warmup test, I do 20 greps > to pull in a 10-gig fileset. Each grep works on 1/20th of the files. [...] > So, schedule() is being called a _lot_ more. But, for some reason, > the slower one wasn't caught doing __copy_to_user() as much. > Bill, does this look like what you're seeing? No, I'm seeing strange load balancing behavior. But you seem to have tripped over a somewhat more severe anomaly. Bill