Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752281AbZI0TwD (ORCPT ); Sun, 27 Sep 2009 15:52:03 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751982AbZI0TwD (ORCPT ); Sun, 27 Sep 2009 15:52:03 -0400 Received: from fg-out-1718.google.com ([72.14.220.152]:50879 "EHLO fg-out-1718.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751976AbZI0TwC convert rfc822-to-8bit (ORCPT ); Sun, 27 Sep 2009 15:52:02 -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:content-transfer-encoding; b=hpBp1iROxc2n7jPfbg3NQtbi0IoKG4PuPNKHbGuJRUQ8LHB4zQbPawMXENtgdfMUVr elZhCsAopH86eMbX4FCHd7ClLUJfIN9Jt5+qtaoVSfDhiQztNLCWorzrXtWVVtRvnxNc a6AjOuNQe/1iTcFYHLyBT4DrbTbI0DocJeM7s= MIME-Version: 1.0 In-Reply-To: References: Date: Sun, 27 Sep 2009 21:52:05 +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 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1435 Lines: 35 On Sun, Sep 27, 2009 at 9:50 PM, drago01 wrote: > 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". Well ok I can expirence some delays when switching workspaces with 100 tasks but it is still better than 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/