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[Qemu-devel] Re: [PATCH 3/3] Implement linux-aio backend
From: |
Marcelo Tosatti |
Subject: |
[Qemu-devel] Re: [PATCH 3/3] Implement linux-aio backend |
Date: |
Fri, 18 Apr 2008 14:46:25 -0300 |
User-agent: |
Mutt/1.4.2.1i |
On Fri, Apr 18, 2008 at 10:18:33AM -0500, Anthony Liguori wrote:
> >Sleeping in the context of vcpu's is extremely bad (eg virtio-block
> >blocks in write() throttling which kills performance). It should wait
> >on IO completions instead (qemu-kvm.c creates a pthread "waitqueue" to
> >resolve that issue).
> >
> >Other than that looks fine to me, will give it a try.
> >
>
> FWIW, I'm not getting wonderful results in KVM. It's hard to tell
> though because time seems wildly inaccurate (even with kvm clock in the
> guest). The time issue appears unrelated to this set of patches.
Oh, you won't get completion signals on the aio eventfd. You might want
to try the select-with-timeout() stuff.
Will submit that with proper signalfd emulation shortly.
- [Qemu-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Anthony Liguori, 2008/04/17
- [Qemu-devel] Re: [kvm-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Daniel P. Berrange, 2008/04/17
- [Qemu-devel] Re: [kvm-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Anthony Liguori, 2008/04/17
- [Qemu-devel] Re: [kvm-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Daniel P. Berrange, 2008/04/17
- [Qemu-devel] Re: [kvm-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Anthony Liguori, 2008/04/17
- Re: [Qemu-devel] Re: [kvm-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Jamie Lokier, 2008/04/18
- Re: [Qemu-devel] Re: [kvm-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Anthony Liguori, 2008/04/18
- Re: [Qemu-devel] Re: [kvm-devel] [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Jamie Lokier, 2008/04/18
- Re: [kvm-devel] [Qemu-devel] Re: [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Avi Kivity, 2008/04/18
- Re: [kvm-devel] [Qemu-devel] Re: [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Jamie Lokier, 2008/04/20
- Re: [kvm-devel] [Qemu-devel] Re: [PATCH 1/3] Refactor AIO interface to allow other AIO implementations, Avi Kivity, 2008/04/20