Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753620AbYKRH5Y (ORCPT ); Tue, 18 Nov 2008 02:57:24 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753035AbYKRHw4 (ORCPT ); Tue, 18 Nov 2008 02:52:56 -0500 Received: from smtp-out.google.com ([216.239.45.13]:6526 "EHLO smtp-out.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753187AbYKRHwz (ORCPT ); Tue, 18 Nov 2008 02:52:55 -0500 DomainKey-Signature: a=rsa-sha1; s=beta; d=google.com; c=nofws; q=dns; h=mime-version:in-reply-to:references:date:message-id:subject:from:to: cc:content-type:content-transfer-encoding; b=g6kjS3c4dlEbWwgyenB+JEPC+p9HJe3RbEdh7ZECxeS3QmwCURGtoEwI5NsGCZhsm 2h+qmRrqwVewRhzpi7PIQ== MIME-Version: 1.0 In-Reply-To: References: <20081115011452.GA28135@google.com> <49218FB4.6090805@nortel.com> Date: Mon, 17 Nov 2008 23:52:50 -0800 Message-ID: Subject: Re: busted CFS group load balancer? From: Ken Chen To: Chris Friesen Cc: Ingo Molnar , Peter Zijlstra , Linux Kernel Mailing List Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1046 Lines: 23 On Mon, Nov 17, 2008 at 7:37 AM, Chris Friesen wrote: >> It appears that the fair-group load balancer in 2.6.27 does not work >> properly. > > There was an issue fixed post 2.6.27 where the load balancer didn't work > properly if there was one task per group per cpu. You might try > backporting commit 38736f4 and see if that helps. On Mon, Nov 17, 2008 at 12:04 PM, Ken Chen wrote: > Tested git commit 38736f4, it doesn't fix the problem I'm seeing. I would also like to mention that commit 38736f4 has stability problems. I put a kernel with this commit on several test machines, and several of them had hard lockups within 2 hours of testing. I wasn't doing anything fancy. The workload was pure 'while (1)' loop. Though there are other background services running on those machines. - Ken -- 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/