Re: [Xen-users] Problem for "xm create": "kernel: Setting mem allocation to ..."

["Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>]

On 19 Oct 2006 at 16:48, harm wrote:

> there is a balloon setting to specify the ram usage by Dom0, look in your
> /etc/xend-config.sxp near the end of the file.

Not here (SLES10): I only have:
# Dom0 will balloon out when needed to free memory for domU.
# dom0-min-mem is the lowest memory level (in MB) dom0 will get down to.
# If dom0-min-mem=0, dom0 will never balloon out.
(dom0-min-mem 196)


> Your error msg indicates there is not enough free ram.

not very clearly, and I wonder why it takes about one minute to find out that 
there's not enough  RAM.

> 
> You can check it with xm list, that will show the current mem usage with
> Xen. Free -h will show system mem usage.

# free -h
free: invalid option -- h
[...]

Ulrich

> 
> On 10/19/06, Ulrich Windl <ulrich.windl@xxxxxxxxxxxxxxxxxxxx> wrote:
> >
> > Hi,
> >
> > When trying to boot a freshly created VM, nothing seems to happen, but
> > Dom0
> > repeats  messages like
> > kernel: Setting mem allocation to ... kIB
> > while "..." is some large number like this:
> > Oct 19 15:55:33 rkdvmso1 kernel: Setting mem allocation to 816764 kiB
> > Oct 19 15:55:41 rkdvmso1 kernel: Setting mem allocation to 816764 kiB
> > Oct 19 15:55:46 rkdvmso1 kernel: Setting mem allocation to 816764 kiB
> > Oct 19 15:55:54 rkdvmso1 kernel: Setting mem allocation to 816764 kiB
> >
> > Eventually I see (after "xm create"):
> > Error: The privileged domain did not balloon!
> >
> > Now I think the error message on the console and in the syslog could be
> > improved:
> > Is Dom0 kernel retrying, how much is available (I assume less than
> > demanded).
> > Could this be a NUMA problem?
> >
> > A "# xm mem-set 0 256" to reduce the mem of Domain-0, but the VM wouldn't
> > start,
> > and Domain-0 re-allocated the previous size (556M)
> >
> > How do I limit the maximum mem for Domain-0, so that DomUs have enough RAM
> > left
> > over for them?
> >
> > Regards,
> > Ulrich
> >
> >
> > _______________________________________________
> > Xen-users mailing list
> > Xen-users@xxxxxxxxxxxxxxxxxxx
> > http://lists.xensource.com/xen-users
> >
> 



_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users