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

To: Yoshiaki Tamura <tamura.yoshiaki@xxxxxxxxxxxxx>, Stefano Stabellini <Stefano.Stabellini@xxxxxxxxxxxxx>
Subject: Re: [Xen-devel] [RFC][PATCH 12/13] Kemari: use signal to save qemu state for Kemari
From: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
Date: Wed, 18 Mar 2009 09:34:18 +0000
Cc: "ospk-vm@xxxxxxxxxxxxx" <ospk-vm@xxxxxxxxxxxxx>, Ian Pratt <Ian.Pratt@xxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Ian Jackson <Ian.Jackson@xxxxxxxxxxxxx>
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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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