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RE: [Xen-users] major slow down with xen implementation

To: 'Geoffrey' <lists@xxxxxxxxxxxxxxxxxxxxx>, "'xen-users@xxxxxxxxxxxxxxxxxxx'" <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] major slow down with xen implementation
From: Nathan Eisenberg <nathan@xxxxxxxxxxxxxxxx>
Date: Thu, 25 Sep 2008 10:23:00 -0700
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That seems like a pretty old version of XEN.  Someone needs to give the RHAS 
repository guys a good poke.

Not endorsing a specific distro here, but I know that the Ubuntu/Debian repos 
are quite up to date - if you're up for trying a different Dom0 distro, I'd 
give that a shot on the same hardware and see what happens.

Thank you,
Nathan Eisenberg
Sr. Systems Administrator
Atlas Networks, LLC

-----Original Message-----
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx 
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Geoffrey
Sent: Thursday, September 25, 2008 9:08 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] major slow down with xen implementation

Todd Deshane wrote:
> On Thu, Sep 25, 2008 at 11:22 AM, Geoffrey <lists@xxxxxxxxxxxxxxxxxxxxx> 
> wrote:
>> We have some fairly robust hardware we are trying to set up a number of
>> para-virtual servers in a clustered environment and we are seeing huge cpu
>> issues.  Specs:
>> Dell 1950: 8 1u servers
>> cpu MHz : 2660.038
>> dual quad cores
>> 32G memory each
>> Our first virual server was configured to use 8G and 4 cores.
>> I tried running a quick test by compiling our application, simply running
>> 'time make.'  The results were terrible:
>> real    0m56.79s
>> user    0m26.53s
>> sys     0m35.46s
>> In comparison, my laptop (Intel Core2 Duo CPU @ 2.50GHz, 2G mem):
>> real    0m42.99s
>> user    0m29.85s
>> sys     0m6.47s
>> We then reconfigured the virtual server to use a single core and the results
>> were almost identical to the 4 core test.
>> Any insights as to what our problem might be would be greatly appreciated.
> Try using kernbench for testing.

I'll do that and post my results.  Pointers as to where I can get it?

> Also, what version of xen, guest kernel etc.?

Red Hat advance server 5.2

Until later, Geoffrey

Those who would give up essential Liberty, to purchase a little
temporary Safety, deserve neither Liberty nor Safety.
  - Benjamin Franklin

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