On Wed, Aug 05, 2020 at 06:37:45PM +0200, Paolo Bonzini wrote:
> On 05/08/20 12:00, Stefan Hajnoczi wrote:
> > +
> > +/*
> > + * aio_notify can avoid the expensive event_notifier_set if
> > + * everything (file descriptors, bottom halves, timers) will
> > + * be re-e
On 05/08/20 12:00, Stefan Hajnoczi wrote:
> +
> +/*
> + * aio_notify can avoid the expensive event_notifier_set if
> + * everything (file descriptors, bottom halves, timers) will
> + * be re-evaluated before the next blocking poll(). This is
> + * already tr
Polling only monitors the ctx->notified field and does not need the
ctx->notifier EventNotifier to be signalled. Keep ctx->aio_notify_me
disabled while polling to avoid unnecessary EventNotifier syscalls.
This optimization improves virtio-blk 4KB random read performance by
18%. The following resul
