Re: [Qemu-devel] [regression] dataplane: throughout -40% by commit 580b6b2aa2

[Ming Lei]

On Thu, Jul 3, 2014 at 12:38 AM, Paolo Bonzini <address@hidden> wrote:
>
>> On Thu, Jul 3, 2014 at 12:23 AM, Paolo Bonzini <address@hidden> wrote:
>> > Il 02/07/2014 18:13, Ming Lei ha scritto:
>> >
>> >> That must be for generating guest irq, which should have been
>> >> processed as batch easily.
>> >
>> >
>> > No, guest irqs are generated (with notify_guest) on every I/O completion
>> > even in 2.0.
>>
>> In 2.0, only notify_guest() is called after event batch is completed,
>
> Ah, you're right.
>
>> I wrote one patch days ago for fixing the problem, and today
>> it is just verified that writes can be decreased to 10K from 120K.
>
> Great.  Can you test/review my aio_notify patch and submit both then?  Bonus
> points, but not a requirement IMO,  if it also helps non-dataplane.

OK, I will take a look and test tomorrow, and it is a bit late for me today.


Thanks,
-- 
Ming Lei