Re: [Qemu-devel] Re: [RFC][PATCH] performance improvement for windows guests, running on top of virtio block device

[Paul Brook]

> Bottom halves are run at the very end of the event loop which means that
> they're guaranteed to be the last thing run.  idle bottom halves can be
> rescheduled without causing an infinite loop and do not affect the
> select timeout (which normal bottom halves do).

Idle bottom halves (i.e. qemu_bh_schedule_idle) are just bugs waiting to 
happen, and should never be used for anything.

Paul