Re: [Xen-users] Running Xen 2.0 for Counter Strike: Source

[Anthony Liguori <aliguori@xxxxxxxxxx>]

Mark Williamson wrote:
> > I'm running Xen on a dual xeon system at the moment and somehow the
> > results are a bit less than what i expected. I’ve started to do some
> > monitoring on it to see how bad it is. you can see for yourself on:
> > http://core.zokahn.com/cs-01/
> >
> > I've installed Xen 2.0 using the howto in howtoforge:
> > http://www.howtoforge.com/perfect_xen_setup_debian_ubuntu
> >
> > This virtual machine is running 2 counter-strike public servers. Games has
> > always been a fine benchmark tool :-) The fps number should be much
> > higher. On my home server (a single p4 running lots and lots of stuff) the
> > reading is 150-200 average untweaked with basic settings.
> >     
>   
Can you provide more actual numbers?

With two servers running, I would not expect anything more than 60fps on 
each. Remember, you're running two (three?) full operating systems with 
two full counter strike servers.
Regards,

Anhtony Liguori
> Hmmmm.  Sounds like performance is degrading badly somewhere.  Have you run 
> any more basic benchmarks to determine if network / disk are performing as 
> they should?
> How have you set up the CPU allocation?  Are you pinning the servers to 
> different CPUs?  Are you using hyperthreading?
> I imagine that CS doesn't make optimal use of the network from a 
> virtualisation PoV, but I'm still a little surpised its that poor.
>   
> > In the counter strike forums there is word about the kernel hz. They say
> > the kernel should be configured to 1000hz. fortunately the used 2.6.11.12
> > kernel has a standard setting of 1000hz. As you can see in the kernel
> > source: include/i386/param.h. However current readings in cs are more like
> > hz is set to 250!
> >     
> Nb. I think the kernel HZ value was reduced to 250 in later kernels anyhow.  
> The kernel developers seem a bit unsure of what to set it to, or whether 
> they're actually that bothered about it.
>   
> > Can I expect this to be the same in xen 3.0?
> >     
> It's worth using Xen 3.0 in any case, since it'll get performance and bug 
> fixes that wouldn't go into 2.0.  Without understanding more of what's 
> causing your problem I can't be more specific.
> Cheers,
> Mark
>
>   

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