Messages in this thread | | | Date | Wed, 15 Feb 2012 15:47:15 +0200 | From | Avi Kivity <> | Subject | Re: [Qemu-devel] [RFC] Next gen kvm api |
| |
On 02/07/2012 06:19 PM, Anthony Liguori wrote: >> Ah. But then ioeventfd has that as well, unless the other end is in >> the kernel too. > > > Yes, that was my point exactly :-) > > ioeventfd/mmio-over-socketpair to adifferent thread is not faster than > a synchronous KVM_RUN + writing to an eventfd in userspace modulo a > couple of cheap syscalls. > > The exception is when the other end is in the kernel and there is > magic optimizations (like there is today with ioeventfd).
vhost seems to schedule a workqueue item unconditionally.
irqfd does have magic optimizations to avoid an extra schedule.
-- error compiling committee.c: too many arguments to function
| |