* vmexit cycle cost
@ 2012-11-16 16:56 Christoffer Dall
2012-11-18 14:16 ` Avi Kivity
0 siblings, 1 reply; 2+ messages in thread
From: Christoffer Dall @ 2012-11-16 16:56 UTC (permalink / raw)
To: KVM General
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
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: vmexit cycle cost
2012-11-16 16:56 vmexit cycle cost Christoffer Dall
@ 2012-11-18 14:16 ` Avi Kivity
0 siblings, 0 replies; 2+ messages in thread
From: Avi Kivity @ 2012-11-18 14:16 UTC (permalink / raw)
To: Christoffer Dall; +Cc: KVM General
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
^ permalink raw reply [flat|nested] 2+ messages in thread
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