Date: Tue, 30 Oct 2012 10:57:21 +0200 From: Andriy Gapon <avg@FreeBSD.org> To: Steven Nikkel <steven_nikkel@ertyu.org> Cc: freebsd-stable@FreeBSD.org Subject: Re: CPU Competition Issue Message-ID: <508F9671.3060501@FreeBSD.org> In-Reply-To: <M.O.0.1210292022200.70211@ertyu.org> References: <M.O.0.1210292022200.70211@ertyu.org>
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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
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