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

To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Problem for "xm create": "kernel: Setting mem allocation to ..."
From: "Ulrich Windl" <ulrich.windl@xxxxxxxxxxxxxxxxxxxx>
Date: Thu, 19 Oct 2006 16:38:52 +0200
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Organization: Universitaet Regensburg, Klinikum
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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


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