Date: Wed, 3 Jun 2020 22:29:29 +0200 From: Gordon Bergling <gbergling@googlemail.com> To: freebsd-hackers@freebsd.org Cc: Allan Jude <allanjude@freebsd.org> Subject: Re: Constant load of 1 on a recent 12-STABLE Message-ID: <20200603202929.GA65032@lion.0xfce3.net> In-Reply-To: <c18664e8-b4e3-1402-48ed-3a02dc36ce29@freebsd.org> References: <20200603101607.GA80381@lion.0xfce3.net> <c18664e8-b4e3-1402-48ed-3a02dc36ce29@freebsd.org>
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Hi Allan,
On Wed, Jun 03, 2020 at 03:13:47PM -0400, Allan Jude wrote:
> On 2020-06-03 06:16, Gordon Bergling via freebsd-hackers wrote:
> > since a while I am seeing a constant load of 1.00 on 12-STABLE,
> > but all CPUs are shown as 100% idle in top.
> >
> > Has anyone an idea what could caused this?
> >
> > The load seems to be somewhat real, since the buildtimes on this
> > machine for -CURRENT increased from about 2 hours to 3 hours.
> >
> > This a virtualized system running on Hyper-V, if that matters.
> >
> > Any hints are more then appreciated.
> >
> > Kind regards,
> >
> > Gordon
>
> Try running 'top -SP' and see if that shows a specific CPU being busy,
> or a specific process using CPU time
Below is the output of 'top -SP'. The only relevant process / thread that is
relatively constant consumes CPU time seams to be 'zfskern'.
-----------------------------------------------------------------------------
last pid: 68549; load averages: 1.10, 1.19, 1.16 up 0+14:59:45 22:17:24
67 processes: 2 running, 64 sleeping, 1 waiting
CPU 0: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
CPU 1: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
CPU 2: 0.0% user, 0.0% nice, 0.4% system, 0.0% interrupt, 99.6% idle
CPU 3: 0.0% user, 0.0% nice, 0.0% system, 0.0% interrupt, 100% idle
Mem: 108M Active, 4160M Inact, 33M Laundry, 3196M Wired, 444M Free
ARC: 1858M Total, 855M MFU, 138M MRU, 96K Anon, 24M Header, 840M Other
461M Compressed, 1039M Uncompressed, 2.25:1 Ratio
Swap: 2048M Total, 2048M Free
PID USERNAME THR PRI NICE SIZE RES STATE C TIME WCPU COMMAND
11 root 4 155 ki31 0B 64K RUN 0 47.3H 386.10% idle
8 root 65 -8 - 0B 1040K t->zth 0 115:39 12.61% zfskern
-------------------------------------------------------------------------------
The only key performance indicator that is relatively high IMHO, for a
non-busy system, are the context switches, that vmstat has reported.
-------------------------------------------------------------------------------
procs memory page disks faults cpu
r b w avm fre flt re pi po fr sr da0 da1 in sy cs us sy id
0 0 0 514G 444M 7877 2 7 0 9595 171 0 0 0 4347 43322 17 2 81
0 0 0 514G 444M 1 0 0 0 0 44 0 0 0 121 40876 0 0 100
0 0 0 514G 444M 0 0 0 0 0 40 0 0 0 133 42520 0 0 100
0 0 0 514G 444M 0 0 0 0 0 40 0 0 0 120 43830 0 0 100
0 0 0 514G 444M 0 0 0 0 0 40 0 0 0 132 42917 0 0 100
--------------------------------------------------------------------------------
Any other ideas what could generate that load?
Best regards,
Gordon
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