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

[Sven Köhler]

>>> 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?

Hmm, perhaps i only heard people talking about it ...
But if i find anything, i post the link.

>>> 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 :-)

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