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

>From: James Harper [mailto:james.harper@xxxxxxxxxxxxxxxx] 
>Sent: Wednesday, December 31, 2008 11:37 AM
>> >Is there a way under Linux of monitoring disk queue length? I am
>> >LVM on top of a low end HP 'Smart Array' (E200) running two RAID1
>> >volumes using SATA disks.
>> >
>> 'sar' could provide such info, IMO.
>iostat shows very very low disk usage when things are frozen. I am
>finding that I can type 'sync' and things will unfreeze again...
>unfreezing before the sync completes. I haven't done this enough times
>to know if things would have unfrozen on their own though.

That looks interesting. Now both cpu/disk utilizations are low, but system
is not responsive for unknown time... Does time in dom0 look sane? I
guess you may have to check behavior/statistics of fe/be drivers in depth,
e.g. event count/s, whether kernel thread is waken effectively, how many
requests handled per event notification, etc. and then may judge whether
those stats are expected.

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