From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1161678AbXDXHMb (ORCPT ); Tue, 24 Apr 2007 03:12:31 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1161677AbXDXHMb (ORCPT ); Tue, 24 Apr 2007 03:12:31 -0400 Received: from wx-out-0506.google.com ([66.249.82.228]:5896 "EHLO wx-out-0506.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1161678AbXDXHM3 (ORCPT ); Tue, 24 Apr 2007 03:12:29 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=beta; h=received:from:organization:to:subject:date:user-agent:cc:references:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:message-id; b=YmTJbLnDjYcST3sp4EB8/k70FYf7XsK1ZfcGPUUtb5rS1mxPwO6p0/bRkcQx6+pQVsTQGJPIVd1I3uYXWZiQqt6T2Fn9pwfVYyDUHEyHokvYiTr3P/Zr2NlrHDhQCSdSkc/Cga4SjUCfTS1j/1bK51TNdjtxH+9esMVN0N5fHrI= From: Gene Heskett Organization: Organization? very little To: Ingo Molnar Subject: Re: [REPORT] cfs-v4 vs sd-0.44 Date: Tue, 24 Apr 2007 03:12:24 -0400 User-Agent: KMail/1.9.6 Cc: Peter Williams , Arjan van de Ven , Linus Torvalds , Nick Piggin , Juliusz Chroboczek , Con Kolivas , ck list , Bill Davidsen , Willy Tarreau , William Lee Irwin III , linux-kernel@vger.kernel.org, Andrew Morton , Mike Galbraith , Thomas Gleixner , caglar@pardus.org.tr References: <200704220959.34978.kernel@kolivas.org> <200704240300.07689.gene.heskett@gmail.com> <20070424070800.GA23463@elte.hu> In-Reply-To: <20070424070800.GA23463@elte.hu> MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit Content-Disposition: inline Message-Id: <200704240312.25015.gene.heskett@gmail.com> Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Tuesday 24 April 2007, Ingo Molnar wrote: >* Gene Heskett wrote: >> > Gene has done some testing under CFS with X reniced to +10 and the >> > desktop still worked smoothly for him. >> >> As a data point here, and probably nothing to do with X, but I did >> manage to lock it up, solid, reset button time tonight, by wanting >> 'smart' to get done with an update session after amanda had started. >> I took both smart processes I could see in htop all the way to -19, >> but when it was about done about 3 minutes later, everything came to >> an instant, frozen, reset button required lockup. I should have >> stopped at -17 I guess. :( > >yeah, i guess this has little to do with X. I think in your scenario it >might have been smarter to either stop, or to renice the workloads that >took away CPU power from others to _positive_ nice levels. Negative nice >levels can indeed be dangerous. > >(Btw., to protect against such mishaps in the future i have changed the >SysRq-N [SysRq-Nice] implementation in my tree to not only change >real-time tasks to SCHED_OTHER, but to also renice negative nice levels >back to 0 - this will show up in -v6. That way you'd only have had to >hit SysRq-N to get the system out of the wedge.) > > Ingo That sounds handy, particularly with idiots like me at the wheel... -- Cheers, Gene "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. Please use in that order." -Ed Howdershelt (Author) When a Banker jumps out of a window, jump after him--that's where the money is. -- Robespierre