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 at koitsu.org |
| UNIX Systems Administrator http://jdc.koitsu.org/ |
| Making life hard for others since 1977. PGP 4BD6C0CB |