On Fri, May 21, 2010 at 11:43:48PM +0800, lei yang wrote:
> On Fri, May 21, 2010 at 8:08 PM, Pasi Kärkkäinen <[1]pasik@xxxxxx> wrote:
>
> On Thu, May 20, 2010 at 04:59:00PM +0800, lei yang wrote:
> > On Thu, May 20, 2010 at 2:04 PM, Pasi Kärkkäinen
> <[1][2]pasik@xxxxxx> wrote:
> >
> > On Thu, May 20, 2010 at 01:59:16PM +0800, lei yang wrote:
> > > Hi Experts,
> > >
> >
> > I removed xen-devel from CC since this is a very basic question,
> > and not related to Xen development.
> > > I want to configure dom0 to 1g and dom0 to 1g ?
> > >
> > > I know dom0_mem=1024M can do it for dom0, how about domU?
> > >
> >
> > Uhm.. for domU you specify:
> >
> > memory = 1024
> >
> > in the domU configuration file (/etc/xen/<guest>).
> > > My machine has 8 cores
> > > how to specify xen to 4 cpus?
> > >
> >
> > Xen is the *hypervisor*, so it has to use ALL the physical
> CPUs/cores,
> > to be able to schedule vcpus!!
> >
> > Do you mean we can't specify xen to 4 cpus, and if we specify
> "nosmp" what
> > does it mean
> > it will use *just* one physical core to schedule vcpus? and dom0
> and domU
> > just can use one core?
> >
>
> Depends where you specify "nosmp", for Xen or for dom0 kernel.
>
>
> if I specify to nosmp to "xen", will dom0 and domU just run core one core?
>
I think so. Why would you want to limit everything to just one core ?
> can we now which core?
>
I don't think so.
-- Pasi
>
> Xen *has* to have access to all the physical cpus/cores you want to use
> for your guest, including dom0.
>
> See Xen vcpu pinning for more information.
> >
> >
> > > how to specify dom0 4 cpus
> > >
> >
> > dom0_max_vcpus=4 for xen.gz in grub.conf.
> >
> >
> >
> > Specified options "dom0_max_vcpus=2" and "dom0_vcpus_pin".
> > Specified option "dom0_max_vcpus=2".
> >
> > what's the difference? which performance will be higher?
> >
>
> Adding dom0_vcpus_pin will automatically pin the dom0 vcpus to matching
> physical cpus.
> That might not make a difference alone.. you need/want to pin the other
> guest vcpus aswell,
> depending what kind of configuration you want to get.
>
>
> "dom0_max_vcpus=2" and "dom0_vcpus_pin". core0 and core 1 will just used
> by dom0? can't be used by others eg: domU?
>
> -- Pasi
>
> >
> > Thanks
> > Lei
> >
> > > how to specify domU 5 cpus ?
> > >
> >
> > vcpus = 5
> > > can we specify dom0 to 1 cpu, at same time domU to 6 cpu
> > >
> >
> > dom0_max_vcpus=1 dom0_vcpus_pin
> >
> > in grub.conf for xen.gz.
> > > can we specify nosmp to xen, and then specify dom0 cpu > 1?
> > >
> >
> > No.
> >
> > See: [2][3]http://wiki.xensource.com/xenwiki/XenBestPractices
> > and: [3][4]http://wiki.xensource.com/xenwiki/XenCommonProblems
> > -- Pasi
> > >
> > >
> > > Thanks
> > > Lei
> > >
> > > --
> > > "We learn from failure, not from success!"
> >
> > --
> > "We learn from failure, not from success!"
> >
> > References
> >
> > Visible links
> > 1. mailto:[5]pasik@xxxxxx
> > 2. [6]http://wiki.xensource.com/xenwiki/XenBestPractices
> > 3. [7]http://wiki.xensource.com/xenwiki/XenCommonProblems
>
> --
> "We learn from failure, not from success!"
>
> References
>
> Visible links
> 1. mailto:pasik@xxxxxx
> 2. mailto:pasik@xxxxxx
> 3. http://wiki.xensource.com/xenwiki/XenBestPractices
> 4. http://wiki.xensource.com/xenwiki/XenCommonProblems
> 5. mailto:pasik@xxxxxx
> 6. http://wiki.xensource.com/xenwiki/XenBestPractices
> 7. http://wiki.xensource.com/xenwiki/XenCommonProblems
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
|
Home