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[Qemu-devel] Re: qemu (cvs-version) performance?
From: |
Sven Köhler |
Subject: |
[Qemu-devel] Re: qemu (cvs-version) performance? |
Date: |
Sat, 11 Mar 2006 23:35:48 +0100 |
User-agent: |
Thunderbird 1.5 (Windows/20051201) |
>> I thought, that qemu-0.8.0's problem would be disk-IO. I installed
>> Windows 2000 and in the task-manager the CPU-Time is 100% during intense
>> IO. A "dir c:\ /A /S /B >NUL:" on the console causes 100% CPU-time and
>> most of it being that red-colored "in-kernel-time".
>
> Qemu host IO is syncrhonous. ie. the guest is paused on the instruction that
> issues the IO until the IO completes. As for as the guest is concerned it
> happens instantly. This is all your test shows.
I have seen thoughts about asynchronous IO for qemu. I thought that they
would have been integrated along with the DMA-patches already.
I would really see how qemu performs with asynch IO enabled. Are there
any patches out there?
Greetings
Sven