Date: Thu, 29 Oct 2015 11:00:32 +0100 From: Miroslav Lachman <000.fbsd@quip.cz> To: Jeremy Chadwick <jdc@koitsu.org>, freebsd-stable@freebsd.org Subject: Re: stable/10: high load average when box is idle Message-ID: <5631EE40.3020404@quip.cz> In-Reply-To: <20151027050508.GA7612@icarus.home.lan> References: <20151027050508.GA7612@icarus.home.lan>
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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. Miroslav Lachman
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