Re: [Xen-devel] x86 patch ping

[Andrew Cooper <andrew.cooper3@xxxxxxxxxx>]

On 08/04/16 13:10, Jan Beulich wrote:
> http://lists.xen.org/archives/html/xen-devel/2016-03/msg02167.html
> (with the 1st patch having gone in already)

Apologies for the delay on this.  I now have results in.

The 64bit performance hit is within the noise (as expected) but sadly,
the performance impact of v3 on 32bit guests is even worse than previous
rounds.

From lmbench:

mmap() has an 85% latency hit.
pagefaults (on /local/scratch) gets a 78% hit.
pipe latency gets a 58% hit.
process fork()/exit() gets a 47% hit.

In each of these cases, that is about 20% worse that previous measurements.

As it currently stands, we really can't justify taking the fix in its
current form.

~Andrew

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