Re: vmexit cycle cost

2012-11-18 Thread Avi Kivity
On 11/16/2012 06:56 PM, Christoffer Dall wrote:
> Hi all,
> 
> just a quick question: using the kvm-unittest vmexit test, it seems
> using a VMCALL for exit, a round-trip to the host takes roughly 1000
> cycles on a modern processor. This number sounds quite low to me. Can
> anyone verify if it's reasonable or have more data on this number has
> developed over time given newer processors?

It's reasonable, not low (this number can never be low enough).


-- 
error compiling committee.c: too many arguments to function
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html


vmexit cycle cost

2012-11-16 Thread Christoffer Dall
Hi all,

just a quick question: using the kvm-unittest vmexit test, it seems
using a VMCALL for exit, a round-trip to the host takes roughly 1000
cycles on a modern processor. This number sounds quite low to me. Can
anyone verify if it's reasonable or have more data on this number has
developed over time given newer processors?

Thanks,
-Christoffer
--
To unsubscribe from this list: send the line "unsubscribe kvm" in
the body of a message to majord...@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html