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

[Ming Lei]

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,
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.

BTW, what do you think about the patch v4 for submitting I/O
as batch?


Thanks,
-- 
Ming Lei