Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751935AbZI0TuJ (ORCPT ); Sun, 27 Sep 2009 15:50:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751421AbZI0TuI (ORCPT ); Sun, 27 Sep 2009 15:50:08 -0400 Received: from fg-out-1718.google.com ([72.14.220.156]:32399 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750890AbZI0TuH (ORCPT ); Sun, 27 Sep 2009 15:50:07 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=pZYw/+uydahQ6D5/HPZAhdkK7D5+S5bt3IDfYVUA61PX1MXlMmjFg0QoOzfRz8KduH d5VWmR/3QvL6z6Vr5i/Hw7pvu2Q/4bTD25C3drtDbghRdYCHvNgLJ4oRohoaB8ttsIr7 9sLWSK+Assw8fFvZCDFtF0Gk5GgzZ8+uZVBvQ= MIME-Version: 1.0 In-Reply-To: References: Date: Sun, 27 Sep 2009 21:50:10 +0200 Message-ID: Subject: Re: sched regression introduced by NO_NEW_FAIR_SLEEPERS From: drago01 To: kernel list Cc: mingo@redhat.com, Chuck Ebbert Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1200 Lines: 31 On Sun, Sep 27, 2009 at 9:47 PM, drago01 wrote: > Hi, > > Chuck has backported some scheduler patches from 2.6.32 to the fedora kernel. > > I did the following test to test the new scheduler (cpu is a core i7 > 920 4 cores + HT). > > run 8 "md5sum /dev/urandom" task and try to use the desktop (compiz). > > The result was that moving windows or rotating the cube is very slow. > (same happens with pure metacity but is is worse in compiz). > > Mounting debugfs and doing "echo NEW_FAIR_SLEEPERS > sched_features" > results into a useable desktop while the 8 md5sum tasks are running > (ie. the system behaves as if they where not running at all from an > interactivity pov). > > > P.S: please CC me when replying. > With "NEW_FAIR_SLEEPERS" I can even run 100(!) "md5sum" task without any effect on interactivity. (still have not found a number of tasks needed to make the system unresponsive as with 8 with "NO_NEW_FAIR_SLEEPERS". -- 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/