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Re: [Qemu-devel] linux aio and cache mode
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From: |
Kevin Wolf |
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Subject: |
Re: [Qemu-devel] linux aio and cache mode |
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Date: |
Mon, 24 Sep 2012 14:30:04 +0200 |
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User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:13.0) Gecko/20120605 Thunderbird/13.0 |
Am 24.09.2012 13:32, schrieb ching:
> Hi all,
>
> My host is qemu-1.1.1 and x64 kernel 3.5.4. The guest is using aio="native"
>
> I am trying to use unsafe cache mode to boost i/o performance.
aio=native requires the image to be opened with O_DIRECT, i.e.
cache=none or cache=directsync. If you specify a different cache option,
it will silently fall back to aio=threads.
Kevin