[Qemu-devel] Re: [PATCH 09/10] Exit loop if we have been there too long

[Paolo Bonzini]

On 11/24/2010 12:14 PM, Michael S. Tsirkin wrote:
> > >  buffered_file timer runs each 100ms.  And we "try" to measure channel
> > >  bandwidth from there.  If we are not able to run the timer, all the
> > >  calculations are wrong, and then stalls happens.
>
> So the problem is the timer in the buffered file abstraction?
> Why don't we just flush out data if the buffer is full?

It takes a lot to fill the buffer if you have many zero pages, and if 
that happens the guest is starved by the main loop filling the buffer.

Paolo