Re: [Xen-devel] [PATCH RFC v2 0/4] HVM x86 deprivileged mode operations

[David Vrabel <david.vrabel@xxxxxxxxxx>]

On 03/09/15 17:01, Ben Catterall wrote:
> 
> Intel Intel 2.2GHz Xeon E5-2407 0 processor:
> --------------------------------------------
> 1.55e-06 seconds was the average time for performing the write without the
>          deprivileged code running.
> 
> 5.75e-06 seconds was the average time for performing the write with the
>          deprivileged code running.
> 
> So approximately 351% overhead
> 
> AMD Opteron 2376:
> -----------------
> 1.74e-06 seconds was the average time for performing the write without the
>          deprivileged code running.
> 3.10e-06 seconds was the average time for performing the write with an entry 
> and
>          exit from deprvileged mode.
> 
> So approximately 178% overhead.

How does this compare to the overhead of passing the I/O through to qemu?

David

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