Date: Thu, 29 Oct 2015 03:09:10 -0700 From: Jeremy Chadwick <jdc@koitsu.org> To: Miroslav Lachman <000.fbsd@quip.cz> Cc: freebsd-stable@freebsd.org Subject: Re: stable/10: high load average when box is idle Message-ID: <20151029100910.GA52255@icarus.home.lan> In-Reply-To: <5631EE40.3020404@quip.cz> References: <20151027050508.GA7612@icarus.home.lan> <5631EE40.3020404@quip.cz>
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On Thu, Oct 29, 2015 at 11:00:32AM +0100, Miroslav Lachman wrote: > Jeremy Chadwick wrote on 10/27/2015 06:05: > >(I am not subscribed to the mailing list, please keep me CC'd) > > > >Issue: a stable/10 system that has an abnormally high load average (e.g. > >0.15, but may be higher depending on other variables which I can't > >account for) when the machine is definitely idle (i.e. cannot be traced > >to high interrupt usage per vmstat -i, cannot be traced to a userland > >process or kernel thread, etc.). > > > >This problem has been discussed many times on the FreeBSD mailing lists > >and the FreeBSD forum (including some folks seeing it on 9.x, but my > >complaint here is focused on 10.x so please focus there). > > > >I'd politely like to request that anyone experiencing this, or who has > >experienced it (and if you know when it stopped or why, including what > >you may have done, include that), to chime in on this ticket from 2012 > >(made for 9.x but style of issue still applies; c#5 is quite valid): > > > >https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=173541 > > > >For those still experiencing it, I'd suggest reading c#8 and seeing if > >sysctl kern.eventtimer.periodic=1 relieves the problem for you. (At > >this time I would not suggest leaving that set indefinitely, as it does > >seem to increase the interrupt rate in cpuX:timer in vmstat -i. But for > >me kern.eventtimer.periodic=1 "fixes" the issue) > > Is it on real HW server or in some kind of virtualization? I am seeing load > 0.5 - 1.2 on three virtual machines in VMware. The machines are without any > traffic. Just fresh instalation of FreeBSD 10.1 and some services without > any public content. I've seen it on both bare-metal and VMs. Please see c#8 in the ticket; there's an itemised list of where I've seen it, but I'm sure it's not limited to just those. -- | Jeremy Chadwick jdc@koitsu.org | | UNIX Systems Administrator http://jdc.koitsu.org/ | | Making life hard for others since 1977. PGP 4BD6C0CB |
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