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[Xen-devel] xm mem-set for HVM Domain

To: xen-devel@xxxxxxxxxxxxxxxxxxx
Subject: [Xen-devel] xm mem-set for HVM Domain
From: cendhu <cendhu@xxxxxxxxx>
Date: Sat, 25 Sep 2010 12:11:14 +0530
Delivery-date: Fri, 24 Sep 2010 23:42:22 -0700
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HI,
     I have an ubuntu 10.04 with xen kernel 2.6.32.11 as Dom0. xm mem-set does not seem to have any effect on the HVM domains.

Xen Version : 4.0.1
HVM : Ubuntu 10.04

I have allocated 512MB to dom0 and 2048MB to HVM.
$xm list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0   512     1     r-----    358.8
lucid_hvm                                    1  2048     1     -b----      5.9

The output of free command in the HVM
$free -m
             total       used       free     shared    buffers     cached
Mem:          2012        153       1858          0         24         74
-/+ buffers/cache:         55       1957
Swap:          228          0        228

Using xm mem-set, i tried to allocate 1024MB to the HVM

$xm mem-set lucid_hvm 1024
$xm list
Name                                        ID   Mem VCPUs      State   Time(s)
Domain-0                                     0   512     1     r-----    363.1
lucid_hvm                                    1  1024     1     -b----      7.2

 xm list shows that only 1024MB of physical memory is allocated to the HVM.

but, the output of free command in the HVM
$ free -m
             total       used       free     shared    buffers     cached
Mem:          2012        154       1858          0         24         74
-/+ buffers/cache:         55       1957
Swap:          228          0        228

No change in allocated memory. But, xm mem-set works perfectly with paraVM.

I migrated HVM to another machine and checked the amount of data transferred which is 2048MB.





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