Re: Dynamic Ticks/HZ

On Mon, Nov 5, 2012 at 7:12 AM, Joe Holden <lists_at_rewt.org.uk> wrote:
> Hi guys,
>
> Has some default changed between 9.1-RC2 and HEAD?
>
> On identical machines, one with 9.1-RC2 and one with HEAD from yesterday
> (GENERIC) I see the following in systat -v:
>
> 9.1:
> 65 cpu0:timer
> 10 cpu1:timer
>
> HEAD:
> 1127 cpu0:timer
> 22 cpu1:timer
>
> These are Supermicro i3 boxes and as far as I can see they have matching
> BIOS config.
>
> Thanks,
> J
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Which is your refresh rate for systat?
I generally measure sampling every one second (i.e. systat -vm 1).
Also, are you making your measurements when the system is idle?
In order to trace the source(s) of these interrupts you might consider
to collect data via KTR.

-- 
Davide