[Xen-devel] RE: freezing when using GPLPV drivers (including Dom0)

["Tian, Kevin" <kevin.tian@xxxxxxxxx>]

>From: James Harper
>Sent: Wednesday, December 31, 2008 10:46 AM
>
>I am suspecting that maybe the problem is disk starvation but I don't
>quite understand why the lockup happens for so long. I'm also not sure
>why I'm only seeing the problem when using my GPLPV drivers - one
>possibility is that the increased performance puts more load on the
>storage system.
>

Maybe you can check cycles spent on kernel thread/event handler
in backend driver side. I'm not sure whether heavy communication
between be/fe could disturb dom0 scheduler if care is not taken in
current design. E.g. back kernel thread may eat too many cycles
before giving up, or your GPLPV fe driver may issue too many events
to break be side... 

Just my two cents. :-)

Thanks,
Kevin
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