Re: [Xen-users] ntpd under Xen Dom0 exhibits extremely high jitter/noise? runs stable/quiet under non-xen kernel.

[mail ignored <0.bugs.only.0@xxxxxxxxx>]

hi

On Wed, Jan 13, 2010 at 9:13 AM, Pasi Kärkkäinen <pasik@xxxxxx> wrote:
> Yes, it's done using Xen Credit Scheduler:
> http://wiki.xensource.com/xenwiki/CreditScheduler

already reading up!

> You might want to give dom0 for example weight of 384 or 512,
> so it'll have more weight than the guests (the default weight is 256).

missed the default value.  that explains that. thanks.

> dom0_vcpus=1 dom0_vcpus_pin

does that *presume* pin to cpu=0?

iiuc, i *should* be also able to

  dom0_vcpus=2 dom0_vcpus_pin

and specify that it pins to cpus=0&1?  or doe the pinning always use
the lowest CPU #s?

> And then make sure the other domains (guests) don't use pcpu 0, using
> cpus=1-3 parameter in /etc/xen/<guest> cfgfiles.

got it.

> Also you might want to dedicate dom0 fixed amount of memory, for example
> 512MB using dom0_mem=512M options for xen.gz, and then disable dom0
> ballooning totally by specifying (dom0-min-mem 512) in 
> /etc/xen/xend-config.sxp

that's already done in my case, @ 1024.

thanks!

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