Re: [Xen-devel] [RFC][PATCH 12/13] Kemari: use signal to save qemu state for Kemari

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 18/03/2009 09:11, "Yoshiaki Tamura" <tamura.yoshiaki@xxxxxxxxxxxxx>
wrote:

> Thanks for measuring the numbers.  It made things clear.
> I think we need a signal-based interface as Ian said previously.
> 
> On our test environment, AMD Barcelona 2.3GHz, the total cpu cycles of Kemari
> in 
> userland when running I/O intensive applications is around 3000000.
> Although Xen transferring code and QEMU saving code is processed concurrently,
> using xenstored for staring QEMU portion would lower the performance.
> Especially if the xenstored gets slower when items are loaded.

Using signals won't work with qemu-dm in a stub domain.

 -- Keir



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