From owner-freebsd-stable@FreeBSD.ORG Tue Oct 30 08:57:32 2012 Return-Path: Delivered-To: freebsd-stable@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id 360C1AAE for ; Tue, 30 Oct 2012 08:57:32 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id 78D0C8FC14 for ; Tue, 30 Oct 2012 08:57:30 +0000 (UTC) Received: from porto.starpoint.kiev.ua (porto-e.starpoint.kiev.ua [212.40.38.100]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id KAA24884; Tue, 30 Oct 2012 10:57:22 +0200 (EET) (envelope-from avg@FreeBSD.org) Received: from localhost ([127.0.0.1]) by porto.starpoint.kiev.ua with esmtp (Exim 4.34 (FreeBSD)) id 1TT7dS-0004en-8D; Tue, 30 Oct 2012 10:57:22 +0200 Message-ID: <508F9671.3060501@FreeBSD.org> Date: Tue, 30 Oct 2012 10:57:21 +0200 From: Andriy Gapon User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:16.0) Gecko/20121013 Thunderbird/16.0.1 MIME-Version: 1.0 To: Steven Nikkel Subject: Re: CPU Competition Issue References: In-Reply-To: X-Enigmail-Version: 1.4.5 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-stable@FreeBSD.org X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 30 Oct 2012 08:57:32 -0000 on 30/10/2012 03:33 Steven Nikkel said the following: > I'm running a long duration CPU-centric process that will gobble up all > available CPU time. I have it set to run at nice +20. While it's running I've > noticed other processes have a hard time getting CPU time and run their > activites very slowly. The processes I've noticed issues with are IO involved, > but they don't appear to be IO blocked as they run dramatically faster and use > much more CPU time when the CPU intensive process is not running. I haven't > noticed issues with other processes, but I haven't been looking. If I push my > CPU intensive process into idle priority 1, all the other processes return to > their normal behaviour as if it's not running. > > This seems to be a specific behaviour on this one machine running 9.0-RELEASE-p4 > on an Atom 330 dual core. I've tried with and without hyperthreading enabled > with no noticeable change in behaviour. Can you try with lower nice value, like +10? You want a fix from r228718. AFAIR, it is not in 9.0. -- Andriy Gapon