[Ovirt-devel] Out of memory causes VM shutdown

[Benoit Guguin]

Hi,

Le 28/09/2010 11:04, Justin Clacherty a écrit :
> I created a new VM today and it ran for a while before mysteriously
> disappearing. I logged in to the node it was running on to take a look
> at the logs and it looks as though the VM was shut down because the node
> ran out of memory. This particular node has 8GB in it and was running 4
> VMs (including the crashed one). The memory assigned to each VM was 4G,
> 1.5G, 512M, 256M. It was the 256M VM that was started last and that’s
> the one that was shutdown. What are the memory requirements of the host OS?
>
Wath's your qemu-kvm version ?
Indeed there was a memory leak on 12.3 corrected in 12.4.

Well you can use a network superviser (zabbix, nagios,...) to see that ;).

> Another thing I’ve noticed on the node is that as the memory usage
> increases a lot of processor time is spent running ksmd. Presumably it’s
> spending time reclaiming memory from buffers and cache. Aren’t buffers
> generally used for disk buffering? Does the host OS need to do this
> given the guest OS will also be buffering the disks?
>
More Memory more thing to analyse, more cpu.
You can control some parameters through : /sys/kernel/mm/ksm


Regards,
> Cheers,
>
> Justin.
>
>
>
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