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Re: [Xen-devel] Interrupt levels

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

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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