| |
|
 |
|
 |
|
|
|
| |
|
|
xen-users
Re: [Xen-users] RAM disapeared?
Heiko wrote:
I have some dom0 which have 8GB RAM, but when I look with xm list, it
just shows me 6GB,
I need to setup some new VM, each with 1GB, so I should have with 3VM
still 5GB free,
but im only seeing 3GB.
Can I just create 2 new VM with each 1GB and still have 3GB for the dom0?
#xm top
xentop - 11:31:17 Xen 3.1.0-53.1.14.el5
4 domains: 1 running, 3 blocked, 0 paused, 0 crashed, 0 dying, 0 shutdown
Mem: 8386888k total, 6336300k used, 2050588k free CPUs: 8 @ 2327MHz
#xm list:
Name ID Mem(MiB) VCPUs State Time(s)
Domain-0 0 3057 8 r----- 1265671.8
xxx-vm2 12 999 2 r----- 4074.0
xxxx-vm2 11 999 2 -b---- 620.2
xxxxxx-vm2 7 999 2 -b---- 238229.7
It could be that the combination of OS & hardware limits the host to
"under 4G" for itself, and so that's all that shows up. The rest of
the ram could well be available to be divvied up between guests
though.
You can also explicitly limit host ram usage, and I believe this is
recommended for two reasons :
1) Some kernel tables are sized according to memory at boot time - so
when the memory is ballooned down, the kernel tables are bigger than
they need to be.
2) When I upgraded Xen at home over Christmas, I came up with an
error (can't recall what) which was specific to running Dom0 without
a memory limit.
You limit Dom0 memory by adding "dom0_mem=<some value>" to your Xen
kernel line, like this :
kernel /xen-3.2-1-amd64.gz dom0_mem=512M
--
Simon Hobson
Visit http://www.magpiesnestpublishing.co.uk/ for books by acclaimed
author Gladys Hobson. Novels - poetry - short stories - ideal as
Christmas stocking fillers. Some available as e-books.
_______________________________________________
Xen-users mailing list
Xen-users@xxxxxxxxxxxxxxxxxxx
http://lists.xensource.com/xen-users
|
|
|
| |
|
Home