Re: [libvirt] [PATCH] docs: correct setmem text plus expand setmaxmem text
On 01/18/2011 05:28 PM, Justin Clift wrote:
This completes the man page updates required for BZ # 622534:
https://bugzilla.redhat.com/show_bug.cgi?id=622534
=item B<setmaxmem> I<domain-id> B<kilobytes>
-Change the maximum memory allocation limit in the guest domain. This should
-not change the current memory use. The memory limit is specified in
-kilobytes.
+Change the maximum memory allocation limit for an active guest domain.
I'm a bit confused here. Doesn't maximum memory allocation only take
effect at domain boot? So it seems like something you can't change at
runtime, and if a change is made to an active domain, it only affects
the configured version and the next boot of the domain rather than
having an immediate effect. But I haven't played closely with
setmaxmem, so I could be wrong.
+
+Some hypervisors require a larger granularity than kilobytes, and requests
+that are not an even multiple will either be rounded down or rejected. For
+example, vSphere/ESX rejects the parameter unless the kB argument is evenly
+divisible by 1024 (that is, the kB argument happens to represent megabytes).
+
+Note, this command only works on active guest domains. To change the memory
+allocation for an inactive guest domain, use the virsh B<edit> command to
+update the XML <memory> element.
I guess this means some experimentation is in order to validate these
claims.
--
Eric Blake eblake(a)redhat.com +1-801-349-2682
Libvirt virtualization library http://libvirt.org
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