Philipp,
I've been pre-allocating 384mb (by setting it in grub) on all of my xen hosts (running CentOS 5.2 / xen 3.3.0 -- gitco). I started doing this some time ago because I run into baloon driver issues when I don't do it (where some or all of the DomU's will lose network connectivity). This value seems to work well for us. Then again, we are running very base Dom0's. That is, minimal install + xen.
total used free shared buffers cached
Mem: 393216 333288 59928 0 8376 160560
-/+ buffers/cache: 164352 228864
Swap: 8385920 172 8385748
I'm not sure what the best practive is though. What I do know is that by doing it this way when you run xm top you will know exactly how much memory is available to allocate to new VM's.
Gary
PS: sorry for top posting, OWA doesn't give me the option.
Hi,
I wonder how much memory the hypervisor needs. I have the following
vms running:
xen26:~# xm list
Name ID Mem VCPUs
State Time(s)
Domain-0 0 725 1
r----- 2064.7
g-hlsan9ib 1 4096 4 -
b---- 160.9
g-lp549ugs 19 1024 4 -
b---- 83.0
g-lpjj78e9 2 1024 2 -
b---- 156.1
g-nt731fct 17 2048 2 -
b---- 116.5
g-resl3iqi 4 2048 4 -
b---- 326.7
g-rujbc3il 5 2048 4 -
b---- 192.6
g-v72lkt0b 6 1024 2 -
b---- 197.5
725+たす4096+たす1024+たす1024+たす2048+たす2048+たす2048+たす1024 =わ 14037mb
dom0 has fixed 725mb of memory, the server has 16gb of memory.
if try to launch another 2048mb vm i get the following:
xen26:~# xm create /etc/xen/g-ida7k5fo.cfg
Using config file "/etc/xen/g-ida7k5fo.cfg".
Error: Not enough free memory and enable-dom0-ballooning is False, so
I cannot release any more. I need 2138112 KiB but only have 1930744.
so if i take the 16384mb of ram minus the used space and the space xen
sys it still has i get:
16384 - 14037 - 1930744/1024 ~= 461.5mb
does the hypervisor really need 460mb of memory?
is there a way to calculate how much memory the hypervisior needs?
lg philipp
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