Anthony Liguori wrote:

[updated patch]

Applied.

>
> Hard to say exactly because of the noise.  I did two runs of 4
> test/vmexit:
>
> Before 4091, 4194, 4559, 4439
> After: 3979, 4324, 3918, 3910
>
> So there's definitely a speedup, but probably only 100-200 cycles.
>

Running on an idle, headless server with the vcpu pinned reduces
variability to a few cycles in the after case.  Strangely, the
variability is high in the before case.  I get a similar disappointing
result of 100-200 cycles.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to 
panic.


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