Hello,
You cannot overcommit memory. However, you can set max-mem to a
higher value and then dynamically (but manually) control the memory
allocation to individual domains.
You can also control the amount of CPU power a domain is
guaranteed to get via the xm sched-credit command. You assign weights to
domains, which are relative.
For example if Dom1 and Dom2 should get both 30 percent and Dom0
should get 40, you would set it for example thus:
xm sched-credit -d Dom1 -w 300
xm sched-credit -d Dom2 -w 300
xm sched-credit -d Dom0 -w 400
In other cases, domains can eat up to the assigned number of VCPUs of
CPU power.
Regards,
Daniel
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Ahmed Kamal
Sent: Monday, July 21, 2008 10:38 AM
To: Red Hat Enterprise Linux 5 (Tikanga) discussion mailing-list
Subject: [rhelv5-list] guaranteed cpu power to VMs
Hi guys,
I'm planning on buying a Dell poweredge 2900 server. I'll be running
5.2 on it. I plan on using Xen to split that fairly powerful machines
(to us). The thing is, I want to control that certian VMs cannot abuse
the whole machine. Basically, I want to control that a certain VM is for
example limited to 60% of total CPU power, another is limited to 20%,
and another to 20%. In case of no cpu contention, one VM could take up
to 100% of CPU power. Does such a facility exist ?
Also, can (should?) I over commit memory allocations. It's basically the
same problem as partitioning CPU power. The server is gonna have 16Gs.
Do I have to hard partition, or can it be somehow dynamic ? This is more
difficult than CPU partitioning, since if all VMs decide to take max
memory, where would the extra data go :)
Appreciating any pointers, as I haven't used xen in production yet
Thanks, Best Regards
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