Re: [Xen-devel] How expensive is a VM EXIT?

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

For just the VMEXIT itself, it's probably about 1000-1500 cycles on the
latest processors. I haven't measured it very recently though.

 -- Keir

On 03/03/2009 15:35, "Emre Can Sezer" <ecsezer@xxxxxxxx> wrote:

> Hi,
> 
> I've been trying to get a ballpark number on how expensive a VM EXIT is
> in terms of clock cycles. I'm also interested in how slow a TLB miss is.
> The only reference I was able to find was 13000 cycles for VM EXIT and
> around several hundred cycles for a TLB miss and a complete walk of page
> tables. Does anyone know from the top of their head or is there a
> reference you can share?
> 
> Thanks in advance.
> 
> John
> 
> 
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