[Qemu-devel] Re: [PATCH 2/7] Enable I/O thread and VNC threads by default

[Jan Kiszka]

On 2011-02-08 09:08, Paolo Bonzini wrote:
> On 02/08/2011 08:26 AM, Aurelien Jarno wrote:
>> I forget to remember when we decided that AIO should be implemented on
>> any host OS. Any pointer?
> 
> To be fair, I/O-heavy workloads are almost unusable without AIO.  For 
> Window targets, they also crash under SMP due to the Windows AP 
> watchdog.  But then TCG and SMP do not go very well together anyway.
> 
> However, I think deprecating Win32 support would be a very bad idea.

It would be too early at this point.

But if Windows is once the only reason to keep tons of hardly tested
code paths around or to invest significant additional effort to change
logic or interfaces in this area, than I would prefer that step. I'm
hacking on IOTHREAD vs. !IOTHREAD for some weeks now, and all those
subtle differences are really a PITA and source of various breakages.

People interested in that platform should finally realize that its fate
is coupled to reducing the #ifdefs as well as the design differences we
see right now and even more in the future.

Jan

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