Re: [Qemu-devel] Re: high CPU load / async IO?

[Fabrice Bellard <fabrice@bellard.org>]

Jens Axboe wrote:
> On Tue, Jul 25 2006, Sven Köhler wrote:
> 
>>>>>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.
>>
>>So i will wait patiently :-)
> 
> 
> Is anyone actively working on this, or is it just speculation? I'd
> greatly prefer (and might do, if no one is working on it and Fabrice
> would take it) do a libaio version, since that'll for sure perform the
> best on Linux. But a posixaio version might be saner, as that should
> work on other operating systems as well.
> 
> Fabrice, can you let people know what you would prefer?

I am working on an implementation and the first version will use the 
posix aio and possibly the Windows ReadFile/WriteFile overlapped I/Os. 
Anthony Liguori got a pre version of the code, but it is not commitable yet.

Fabrice.