RE: [Xen-users] Set PCI device latency from domU?

["[STD]Ein" <ein@xxxxxxxxxxxxxx>]

I doubt you would be able to change it from the domU so I believe this is
expected behaviour.  Changing the latency equates to writing the the pci
control registers, something that is definitely not allowed from a domU.
Even if that was not the case, it would be possible for a domU to affect
performance and reliability of the overall system if it could do so.

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Ben Holt
Sent: April 10, 2008 2:36 PM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Set PCI device latency from domU?

If a PCI device has been passed to a domU is it possible to set its
latency from the domU or does it have to be done from the domO?

When I attempt to set a devices latency from the domU with setpci I do
not receive an error message back indicating a problem, however the
latency as viewed with lspci -v is not changed.  The same setpci
command from the dom0 successfully changes the latency and the change
is shown with lspci -v on both dom0 and the domU to which the device
has been passed.

- Ben

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