Re: [Xen-users] Improve performance of domain U

["Fabrice Toppi" <ftoppi@xxxxxxxxx>]

Hi,

you can adjust the priority of each domain (including dom0) with the "xm sched-sedf" command.
If you use the weight parameter, say you give a domain X a weight of 512 and a domain Y a weight of 1024, then when both domains X and Y try to use full CPU, domain Y will get twice CPU time than domain X.
It's also possible to allow domains to use extra CPU time when other domains are idle (doesn't hurt anyone since they don't use CPU ;).

Fabrice T.

2006/9/3, Martin Svedin < martin.svedin@xxxxxxxxx>:

I have a similar question. When I get some load on my dom0 all the
domUs more or less freeze and are impossible to work with (though the
dom0 is as responsive as ever (unless I have some really heavy load
ofcourse :) ) ).

Is there some (easy) way to make sure that the dom0 doesn't 'steal'
the CPU or is this working as intended?

On 9/3/06, saptarshi naha <naha80@xxxxxxxxx> wrote:
> I just had a quick question about improving the performance for Xen VM's.
>
> I have installed Xen 3.0.2 on RHEL4 with 1 kernel compiled for all
> domains. When I access by VM's the performance of the domain U is
> slower then taht of domain 0.
>
> 1. I wanted to know if there are any configuration changes I can make
> to improve the performance of domain U?
>
> 2. Domain U have no /boot sector in /etc/fstab. It is all a single
> partition in / . I wanted to know if there are any shortcoming to just
> having / partition to performance?
>
> 3. Also can the domain U be given swap space to improve performance? I
> am guesssing thats the swap is used from domain 0 which was added
> during inital installation.
>
> 4. Is the performance of teh domain U dropped due to internal
> networking through bridging? I wanted to know if anyone knows how to
> fine tune it to improve performance.
>
> Thanks,
> Naha.
>
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