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[Qemu-devel] Re: high CPU load / async IO?
From: |
Anthony Liguori |
Subject: |
[Qemu-devel] Re: high CPU load / async IO? |
Date: |
Tue, 25 Jul 2006 09:55:14 -0500 |
User-agent: |
Pan/0.14.2 (This is not a psychotic episode. It's a cleansing moment of clarity.) |
On Tue, 25 Jul 2006 00:51:23 +0200, Sven Köhler wrote:
>> IDE only supports one outstanding request, so having a thread that runs
>> the synchronous block routines appears reasonable. However, SATA and SCSI
>> both support multiple outstanding requests. The extension to the existing
>> patch would be simple--increase the number of threads.
>
> ???
>
> Wasn't there another variant using the async-I/O support of the Host OS
> and thereby supporting a larger number of outstanding requests?
Not that I know of. Do you have a pointer?
> The approch that i mentioned above (using the host's async I/O) is what
> you mean with using linux-aio, right?
It depends on what you mean by the host's async I/O implementation.
>> So the current thread-based async dma patch is really just the wrong long
>> term solution. A more long term solution is likely in the works. It
>> requires quite a bit of code modification though.
>
> I see. So in other words:
>
> don't ask for simple async I/O now. The more complex and flexible
> sollution will follow soon.
Yes, hopefully really soon.
Regards,
Anthony Liguori
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- [Qemu-devel] high CPU load / async IO?, Sven Köhler, 2006/07/23
- [Qemu-devel] Re: high CPU load / async IO?, Anthony Liguori, 2006/07/24
- [Qemu-devel] Re: high CPU load / async IO?, Sven Köhler, 2006/07/24
- [Qemu-devel] Re: high CPU load / async IO?,
Anthony Liguori <=
- [Qemu-devel] Re: high CPU load / async IO?, Sven Köhler, 2006/07/25
- Re: [Qemu-devel] Re: high CPU load / async IO?, Jens Axboe, 2006/07/25
- Re: [Qemu-devel] Re: high CPU load / async IO?, Fabrice Bellard, 2006/07/25
- Re: [Qemu-devel] Re: high CPU load / async IO?, Jens Axboe, 2006/07/26
- Re: [Qemu-devel] Re: high CPU load / async IO?, Paul Brook, 2006/07/26
- Re: [Qemu-devel] Re: high CPU load / async IO?, Jens Axboe, 2006/07/26
- Re: [Qemu-devel] Re: high CPU load / async IO?, Paul Brook, 2006/07/26
- Re: [Qemu-devel] Re: high CPU load / async IO?, Jens Axboe, 2006/07/26
- [Qemu-devel] Re: high CPU load / async IO?, Sven Köhler, 2006/07/26
- Re: [Qemu-devel] Re: high CPU load / async IO?, Jens Axboe, 2006/07/26