Re: [Xen-devel] Xen 3.1.1 -- initial patchqueue

[Ben Guthro <bguthro@virtualiron.com>]

Keir Fraser wrote:
> On 10/9/07 13:03, "Ben Guthro" <bguthro@virtualiron.com> wrote:
>
>   
>> 15185-1f8fb764f843
>> http://xenbits.xensource.com/xen-unstable.hg?rev/1f8fb764f843
>>     
> I'm inclined not to backport this one.
>
>   
If I recall - It applied against our 3.1 tree without any 
backporting...we just exported, and applied it. It increased performance 
on Caneland machines greatly. Test results against our 3.1 based product 
below:

<test results>
At Ben's request, I did a quick evaluation of the APIC TPR patch for 
Caneland.
I used yesterday's build to establish a baseline for booting, running 
SPECjbb2005, and
netperf on a SMP XP guest. I then repeated the tests with a custom 
kernel. The patch
showed significant improvement for 2 of the 3 tests I used. Here are the 
results:

Test                 20070816     Patch    % Improvement
Boot time - Seconds    62.6        40.5         35%
SPECjbb2005 OPs/Sec   35216       35686          1%
TCP XMIT (MBits/sec)   70.2       309.5        341%
TCP RCV (MBits/Sec)   122.3       423.5        246%

These tests were done on a Caneland, with 4 quad-core sockets and 32GB 
of memory.
The guest is Windows XP Professional with SP2, 2 CPUs, 2GB memory. This 
afternoon,
I'll repeat the experiment on a non-Caneland machine to see if there are 
any
side effects.

</test results>

> The two Linux changesets are not applicable to 3.1.
>   
Yes, of course...my mistake. I forgot to weed out my "unstable-only" 
patches from the list.