On Wed, May 28, 2025 at 03:09:15PM -0400, Stefan Hajnoczi wrote:
> fdmon_ops->wait() is called with notify_me enabled. This makes it an
> expensive place to call qemu_bh_schedule() because aio_notify() invokes
> write(2) on the EventNotifier.
>
> Moving qemu_bh_schedule() after notify_me is reset
fdmon_ops->wait() is called with notify_me enabled. This makes it an
expensive place to call qemu_bh_schedule() because aio_notify() invokes
write(2) on the EventNotifier.
Moving qemu_bh_schedule() after notify_me is reset improves IOPS from
270k to 300k IOPS with --blockdev file,aio=io_uring.
I
