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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> |
| Delivery-date: | Wed, 18 Mar 2009 02:34:48 -0700 |
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| Thread-topic: | [Xen-devel] [RFC][PATCH 12/13] Kemari: use signal to save qemu state for Kemari |
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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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel |
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