On 9/25/13 11:04 PM, Roger Pau Monné wrote:
On 25/09/13 16:56, Julian Elischer wrote:
If CPUs are mapped around, how are IPIs handled? I assume they must be
emulated?
I've noticed that under Xen (on both Amazon EC2 and a Redhat server)
whenever you schedule a thread it always sits on the run queue for 20
uSecs before it starts running. It looks to me like it's the IPI taking
a long time to be emulated.
This has been improved on the FreeBSD Xen PVHVM port by using PV IPIs
instead of the emulated ones, see r255331. It should be faster than the
previous emulated implementation.
I missed that.. thanks!
Do you (or anyone else) know if this can be used on Amazon EC2?
And do you need a specific version/configuration of Xen to be able to
use it?
_______________________________________________
[email protected] mailing list
http://lists.freebsd.org/mailman/listinfo/freebsd-virtualization
To unsubscribe, send any mail to
"[email protected]"
