[Xen-users] using maxmem

[Alexandre Chapellon <a.chapellon@xxxxxxxxx>]

Hi,

I am using xen 4.0.1 from debian Squeeze repositories and dom0 has 
kernel 2.6.32-5-xen-amd64(also stock debian).
I wanted to set a high value to maxmem in my xmdomain.cfg vm config 
files so that I can increase memory as needed without rebooting.
Unfortunately as soon as I set this paramater I see really wiered things.
For example, I am trying to install a windows HVM guest. When maxmem is 
not set, the first screen of the installer appear after less than 30. If 
I set maxmem to 12288 (12GB, i guess), the installer screen takes more 
than 3min30sec to splash...
I have also tried to decrease maxmem to 8GB then 4GB (while 
memory=2048)... but that doesn't help... Well I have to say that the 
lower maxmem is set, the faster the VM are.
But when set the VM are generally slow and unstable, as I did not 
succeded to complete any installl because of guests crashing.
Not sure if it's related but, few times ago, I had an issue while doing 
live migration of a PV guest (migration seemed OK but VM was frozen) 
that also had maxmem set to such a value...  I never experienced livemig 
problem like this before...
Is there any options that may be incompatible with maxmem? Or am just 
doing bad use of maxmem?
Did anybody experienced similar behaviour?

Regards
--
<http://www.horoa.net>

Alexandre Chapellon

Ingénierie des systèmes open sources et réseaux.
Follow me on twitter: @alxgomz <http://www.twitter.com/alxgomz>


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