RE: [Xen-users] Performance question on 32-bit HVM DomU vs 64-bit HVM DomU on top of 64-bit Xen Hypervisor

[Kelven Yang <kelven@xxxxxxxxx>]

Hi Evgeniy, 

Thanks for the reply.

I used Netperf 
(ftp://ftp.cup.hp.com/dist/networking/benchmarks/netperf/netperf-2.4.1.tar.gz) 
as the testing tool.

Here is my test configuration

        . CentOS 5.2 with Xen 3.3.0 64-bit Hypervisor
        . 32-bit Windows XP HVM guest with PV drivers
        . 32-bit Windows XP HVM guest with PV drivers
        . 64-bit Windows XP Pro HVM guest
        . 62-bit Federa10 PV guest 
        . 32-bit CentOS 5.2 PV guest
        . 1Gbits/second network

Network throughput on 32/64 bit PV guests are almost the same, but 32-bit 
Windows HVM performed far slower than its 64-bit counterpart. 

        About 930 mbits/second on 32/64 bit PV guests
        About 140 mbits/second on 64-bit Windows XP HVM guest
        About 30 mbits/second on 32-bit Windows XP HVM guest with PV drivers
        About 15 mbits/second on 32-bit Windows XP HVM guest without PV drivers

Kelven

-----Original Message-----
From: Evgeniy Sudyr [mailto:eject.in.ua@xxxxxxxxx] 
Sent: Friday, June 19, 2009 2:07 PM
To: Kelven Yang
Subject: Re: [Xen-users] Performance question on 32-bit HVM DomU vs 64-bit HVM 
DomU on top of 64-bit Xen Hypervisor

Kelven, How you compared performance, what benchmarking tools you used?
If you ean GUI speed ... - following my experience you can note that
you used not only different architecture of same OS - you used a bit
different OS which means - other kernel, other drivers(which may be
performance issue), other updates installed, and main performance
issue for windows is list of installed/running programs/services.

In my opinion it's impossible to say - I have same , but 32 vs 64 ...
I guess that problem somewhere deep inside config.


P.S.
I'm not Xen expert , this is my minds.
I'm interest for answer from more experienced Xen guys and their
answers/explanations.

--
Thanks!
Evgeniy Sudyr
http://www.eject.name

On Fri, Jun 19, 2009 at 9:49 PM, Kelven Yang<kelven@xxxxxxxxx> wrote:
> Hello,
>
>
>
> Iâm now doing some network performance testing on running Windows XP on top
> of a 64-bit Xen Hypervisor, I compared the performance results on a 32-bit
> Windows XP and a 64-bit Windows XP (both are running as a HVM guest on
> 64-bit Xen Hypervisor), I found that with a 32-bit windows XP, it performs
> much slower than 64-bit windows XP, could anyone explain the reason of it?
>
>
>
> Thanks in advance
>
> Kelven
>
> _______________________________________________
> Xen-users mailing list
> Xen-users@xxxxxxxxxxxxxxxxxxx
> http://lists.xensource.com/xen-users
>

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