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xen-devel
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
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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