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Re: [Xen-devel] [PATCH] respin of mprotect performance patch

On 22.01.2008 22:51, Bruce Rogers wrote:
I believe SAP is doing some broad based testing of their own which may help 
identify how much the hardware has to do with the performance of this test.

We are currently testing the patched kernels we got from Red Hat and Novell with several Intel Tigerton (Quad Socket, Quad Core, shared L2 Cache @ 2.93GHz) machines. I can't say for sure, if we'll have AMD too. It'll take a week until I can provide exact results.


What results do you get with native (non-smp) on that same hardware? Have you 
done runs on other hardware and seen consistent results?

- Bruce

On 1/22/2008 at 11:55 AM, in message
<20080122135534.1225627e@xxxxxxxxxxxxxxxxxxxxxx>, Rik van Riel
<riel@xxxxxxxxxx> wrote:
On Mon, 21 Jan 2008 10:41:59 -0500
Rik van Riel <riel@xxxxxxxxxx> wrote:

I tested a quick backport of these patches to XEN 3.1.2 and
kernel 2.6.18.

Unfortunately, performance and scalability do not seem to
have improved with these patches,
OK, it turned out the guys with the SAP mprotect benchmark program
made the mistake of only upgrading the dom0 kernel and not the guest.

With both dom0 and guest, mprotect performance has improved slightly
on our dual cpu, dual core (4 cores total) Intel x86-64 test system:

1        13108.77    11188.68
2        13135.63    11146.06
3        10522.82     9910.10
4         8622.47     9399.66
6         6571.49     7078.12
8         5141.23     5389.15
10        4514.37     4372.87
12        4226.79     3802.98

So we have about a 10-15% performance improvement at some numbers of
streams, and a performance decrease at some other numbers of streams.
Over-all performance impact of the patch seems to be about even :(

I wonder if this is just an artifact of the system we tested this on,
or if it can be seen across multiple systems.

Bruce, what kinds of systems have you tested the patch on and what
kind of performance numbers are you seeing?

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