swi4: clock taking 40% cpu?!?

[Jason Hellenthal]

Should also mention the kern.sched may be playing a part in this too.

On Sat, Dec 17, 2011 at 11:20:29AM -0500, Jason Hellenthal wrote:
> 
> 
> On Thu, Dec 15, 2011 at 12:51:28PM -0800, Doug Barton wrote:
> > Howdy,
> > 
> > Web server under heavy'ish load (7 on a 2 cpu system) running
> > 8.2-RELEASE-p4 i386 I'm seeing this:
> > 
> > PID USERNAME PRI NICE   SIZE    RES STATE   C   TIME   WCPU COMMAND
> > 12  root     -32    -     0K   112K WAIT    0 129:01 39.99% {swi4: clock}
> > 
> > Any ideas why the clock should be taking so much cpu? HZ=100 if that
> > makes a difference ...
> > 
> > 
> 
> Without NTPd running test the following.
> 
> 
> apply "/usr/bin/time -ph sleep %1" 300 600 900
> 
> If the results are skewed quite a bit then your system may benefit from a different HZ than what you have set. I have seen systems that require a HZ of 350 and as weird as it sounds NTPd may be tasting the clock too much just to try and keep time.
> 
> -- 
> ;s =;

-- 
;s =;