Re: [Xen-devel] Interrupt levels

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 8 Mar 2005, at 08:50, Nicholas Lee wrote:

> > 55k interrupts a second on a supposedly idle machine is way too many.
> > Please can you post the ouput of 'cat /proc/interupts' a few seconds
> > appart.
> nic@stateless:~$ cat /proc/interrupts > interrupts.1 ; sleep 5 ; cat 
> /proc/interrupts > interrupts.2
> nic@stateless:~$ diff -u interrupts.1 interrupts.2
This can happen if you block/unblock very frequently. The timer 
interrupt from Xen isn't entirely tick-based -- you also get a timer 
interrupt every time you are rescheduled.
So the large number of timer interrupts indicates lots of unblocking. 
Really we should hold-off the timer interrupt if the domain was 
descheduled for less than a jiffy. :-)
 -- Keir



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