Re: [Qemu-devel] virtio-serial-pci very expensive during live migration

[Paolo Bonzini]

Il 08/05/2014 15:30, Amit Shah ha scritto:
> On (Thu) 08 May 2014 [15:14:26], Paolo Bonzini wrote:
> > Il 08/05/2014 15:02, Amit Shah ha scritto:
> > > > > I tried the patch below.  Unfortunately it seems to cause qemu to crash.
> > > This doesn't remove the memory_region_transaction_begin() and
> > > _commit() from memory_region_add_eventfd(), which will still be
> > > called.
> >
> > That's correct, transactions can be nested.
>
> But each _commit() will add to the delay?

No, only the outermost one.

Paolo