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RE: [Xen-users] Ram question

To: "Robbie A. Garrett" <RGarrett@xxxxxxxxxxxxxx>, <xen-users@xxxxxxxxxxxxxxxxxxx>
Subject: RE: [Xen-users] Ram question
From: Jeff Sturm <jeff.sturm@xxxxxxxxxx>
Date: Mon, 28 Sep 2009 10:00:50 -0400
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Thread-topic: [Xen-users] Ram question

Typically yes, though I believe the balloon driver allows a domain to give some of its memory back to Xen.


See the "xm" documentation, in particular mem-max and mem-set.


From: Robbie A. Garrett [mailto:RGarrett@xxxxxxxxxxxxxx]
Sent: Monday, September 28, 2009 10:37 AM
To: Jeff Sturm; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Ram question


thanks for the response.


Another question comes out of this.


if i assign a vm 515mb of ram...  will the free_memory reflect that? or as the vm uses the memory, will the free_memory decrease.


From: Jeff Sturm [jeff.sturm@xxxxxxxxxx]
Sent: Monday, September 28, 2009 9:32 AM
To: Robbie A. Garrett; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: RE: [Xen-users] Ram question

The "xm info" command will tell you this, among other things:


# xm info

total_memory           : 32766

free_memory            : 24128


This host for example has a 2GB dom0, with 32GB physical memory, of which about 24GB is usable for virtualization.  (The memory sizes are reported in MB.)




From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx [mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Robbie A. Garrett
Sent: Monday, September 28, 2009 10:19 AM
To: xen-users@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-users] Ram question


Hey all,


have a question about limiting ram in grub.


i have set my grub to have a config line of dom0_mem=800M which limits dom0 to 800megs of ram.


i want to ensure that xen will still be able to use the rest of the system ram for the vm's for the server has over 16gb of ram.


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