unexpected output vmstat -s

Rick Clark rick.clark at ubuntu.com
Mon Aug 11 18:15:17 UTC 2008

On Monday 11 August 2008 12:17:51 Matt Zimmerman wrote:
> On Mon, Aug 11, 2008 at 04:24:24PM +0200, Sander van Vugt wrote:
> > Thanks for your feedback. From it (and my ignorance ;-) follows another
> > question. For performance measuring purposes, I think it is useful to
> > compare interrupts and CPU context switches in a non tickless kernel.
> Why?  Are you using the number of interrupts as a measure of uptime?  Of
> workload?  There are better metrics for those.
> --
>  - mdz

Looking at context switches is an old UNIX admin's way of pushing performance 
issues back on application developers.  I have never compared interrupts to 
context switches before, they seem unrelated to me.  My main concern now is 
to determine whether the number interrupts have indeed been reduced and that 
we don't have some issue increasing context switches somewhere.

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