unexpected output vmstat -s

Rick Clark rick.clark at canonical.com
Mon Aug 11 13:40:33 UTC 2008

On Saturday 09 August 2008 10:36:41 Sander van Vugt wrote:
> Hi List,
> I notices something I don't understand in the vmstat -s output. In other
> Linux distributions I know, the amount of interrupts is always much
> higher than the amount of context switches. As far as I know, that from
> the operating system perspective is also what you would expect, as a
> context switch needs a timer interrupt to do its work. Now when I do
> vmstat -s on Ubuntu Server 8.04, the amount of context switches is about
> 5 times as high as the amount of interrupts, where I would expect the
> exact opposite. Can anyone explain this? Is this a specific Ubuntu feature?
> Thanks,
> Sander


I also believe that this is the tickless kernel.  Could you verify that you 
are fewer interrupts and not more context switches then expected.

Rick Clark
Manager, Ubuntu Server Team
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