Re: [Xen-ia64-devel] [IPF-ia64] with Cset 10690, creating a VTImake xen0 hang

[Isaku Yamahata <yamahata@xxxxxxxxxxxxx>]

On Wed, Jul 12, 2006 at 11:12:00AM +0800, Xu, Anthony wrote:
> Hi Alex,
>       When VTI-domain does IO operation, an event is sent to dom0, then
> Qemu is woken up to handle this request. Process switch on dom0 may call 
> itr_d,
> if task_struct of qemu is not covered by TR. But the emulation of itr_d is 
> very 
> slow, due to purge vhpt. This is the root cause of slowness of vti-domain boot
> on your side, and vti-domain can't boot on my side.
> 
>       I think purging vhpt in emulating itr_d also slow down dom0 and domU,
> So the question is, is purging vhpt in emulating itr_d necessary?

For correctness, yes. (SDM vol2 4.1.1.4 and table 4-1.)
For Linux working, no (at least linux 2.6.16.13). 
I don't know other OSes other than Linux.

Thanks.
-- 
yamahata

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