Jens Axboe wrote:
On Fri, Jun 01 2007, Carsten Otte wrote:
With regard to compute power needed, almost none. The penalty is
latency, not overhead: A small request may sit on the request queue to
wait for other work to arrive until the queue gets unplugged. This
penality is compensated by the benefit of a good chance that more
requests will be merged during this time period.
If we have this method both in host and guest, we have twice the
penalty with no added benefit.
I don't buy that argument. We can easily expose the unplug delay, so you
can kill it at what ever level you want. Or you could just do it in the
driver right now, but that is a bit hackish.
That would be preferable if the device driver can chose the unplug
delay, or even better it could be (guest)sysfs tuneable.
so long,
Carsten
_______________________________________________
Virtualization mailing list
Virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx
https://lists.linux-foundation.org/mailman/listinfo/virtualization
