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xen-devel
Re: [Xen-devel] [RFC][PATCH 12/13] Kemari: use signal to save qemu state
Keir Fraser wrote:
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.
Yes. I have the following options in my mind to solve it.
1. Switch using signals for qemu-dm in Dom0, and xenstored for stub domains.
2. Prepare a dedicated event channel for saving QEMU state.
I guess using a dedicated event channel would be quicker than xenstored but
slower than signals. If it is, using a dedicated event channel for option 1 may
be better.
Yoshi
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