Re: [Xen-devel] Using debug-key 'o: Dump IOMMU p2m table, locks up machine

["Jan Beulich" <JBeulich@xxxxxxxx>]

>>> On 02.09.12 at 09:42, Keir Fraser <keir.xen@xxxxxxxxx> wrote:
> On 31/08/2012 22:45, "Sander Eikelenboom" <linux@xxxxxxxxxxxxxx> wrote:
>> - When using serial console: I get a infinite stream of "gfn:  mfn: " lines,
>> mean while on the normal console, S-ATA devices are starting to give errors.
> 
> In this case the handler must be running in tasklet context. Not sure why
> SATA interrupts would be affected as hardirq and softirq work will still be
> carried out during execution of the keyhandler (the handler voluntarily
> preempts itself for softirq work).
> 
> Would need more investigation. :)

Isn't that because tasklets (i.e. idle vCPU-s with tasklets active)
get preferred in the schedulers? Some compensation might be
needed for the penalized vCPU, at least if that one is pinned
(not sure whether load balancing would be able to steal the
head of the run queue from a remote CPU). Sander - are you
by chance pinning Dom0 vCPU-s? And how many of them does
your Dom0 have?

Jan


_______________________________________________
Xen-devel mailing list
Xen-devel@xxxxxxxxxxxxx
http://lists.xen.org/xen-devel