Re: Very high memory usage with KVM

[Daniel Bareiro <daniel-listas@gmx.net>]

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Avi

On Sunday, 26 July 2009 18:11:27 +0300,
Avi Kivity wrote:

> >>What is the storage configuration? Are you using qcow2?

> >I'm not using qcow2 files. The /dev/cciss/c0d0p3 partition is a
> >physical volume that maintains the logical volumes that are used for
> >VM's disks:
 
> In this case there should be no excessive memory usage.  qcow2 could
> use extra memory, especially on older qemu-kvm versions (or images
> created with older qemu-img versions).
 
> >>What is the host kernel (uname -a)?

> >root@ss02:~# uname -a
> >Linux ss02 2.6.24-19-server #1 SMP Wed Aug 20 18:43:06 UTC 2008 x86_64 GNU/Linux

> kvm memory management with pre 2.6.27 host kernels is pretty weak.
> Using a newer host kernel (and newer kvm) may solve this problem.

Initially I am going to see how it improves the situation upgrading to
KVM-84 of backports of Hardy Heron, since at the moment last kernel
available for Hardy is the one I has commented.

I would like to know if the newest versions of KVM published in the
official site of the project solve a bug recently reported in Ubuntu
Launchpad [1]. Also I was observing errors of type 'to swapper Not
tainted' or 'java Not tainted' in the VM (aps2, with a high rate of I/O)
and that I've commented in a previous message sent to the list [2]. I
would want to know if you could indicate to me if this can be due to KVM
bug that would be solved in a later version.

Thanks for so quick reply.

Regards,
Daniel

[1] https://bugs.launchpad.net/ubuntu/+source/kvm/+bug/359447
[2] http://thread.gmane.org/gmane.comp.emulators.kvm.devel/37631
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