Date: Tue, 30 Oct 2012 22:41:04 +1030 From: Shane Ambler <FreeBSD@ShaneWare.Biz> To: Andriy Gapon <avg@FreeBSD.org> Cc: Steven Nikkel <steven_nikkel@ertyu.org>, freebsd-stable@FreeBSD.org Subject: Re: CPU Competition Issue Message-ID: <508FC3D8.8030800@ShaneWare.Biz> In-Reply-To: <508F9671.3060501@FreeBSD.org> References: <M.O.0.1210292022200.70211@ertyu.org> <508F9671.3060501@FreeBSD.org>
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On 30/10/2012 19:27, Andriy Gapon wrote: > 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. > Could it be cache based? The atom's smaller cache causing more cache misses. Would you be running zfs?
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