Il 07/06/2012 03:38, Asias He ha scritto:
>> > I never looked at the kvmtool code, but I think Asias has a point. If
>> > the guest submits I/O to lots of devices, they would contend on the
>> > single thread. There was a similar proof of concept patch for QEMU that
>> > provided substantial benefit.
>> >
>> > However, it sounds a bit wasteful to have the dedicated thread run with
>> > a second eventfd. Would it be hard to just use the virtio-blk ioeventfd
>> > directly?
> Without this patch, we are already using the virtio-blk ioeventfd
> which is being monitored in the shared ioeventfd__thread() thead.
Yes, I understood that. :) I'm wondering why it is still necessary to
monitor that eventfd in the shared thread. Perhaps you could optionally
skip the epoll registration/deregistration in ioeventfd__{add,del}_event.
Paolo
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