Re: Modifying RAM during runtime on guest

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

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On Tuesday, 29 September 2009 00:55:02 -0400,
Jim Paris wrote:

> > According to the tests that I was doing in guest with kernel with
> > support for virtio, shrinking works, but when trying to return to
> > the amount of initial memory, seems that it fails and I lose
> > connectivity by serial console and ssh.
> > 
> > In the guest:
> > 
> > # uname -a
> > Linux central 2.6.26-2-amd64 #1 SMP Sun Jul 26 20:35:48 UTC 2009 x86_64 GNU/Linux
> > 
> > # cat config-2.6.26-2-amd64 | grep -i virtio
> > CONFIG_NET_9P_VIRTIO=m
> > CONFIG_VIRTIO_BLK=m
> > CONFIG_VIRTIO_NET=m
> > CONFIG_HW_RANDOM_VIRTIO=m
> > CONFIG_VIRTIO=m
> > CONFIG_VIRTIO_RING=m
> > CONFIG_VIRTIO_PCI=m
> > CONFIG_VIRTIO_BALLOON=m
> > 
> > In the host:
> > 
> > # telnet localhost 4045
> > Trying 127.0.0.1...
> > Connected to localhost.
> > Escape character is '^]'.
> > QEMU 0.10.50 monitor - type 'help' for more information
> > (qemu)
> > (qemu) info balloon
> > balloon: actual=512
> > (qemu) balloon 256
> > (qemu) info balloon
> > balloon: actual=256
> > (qemu)
> > (qemu) balloon 512
> > (qemu) info balloon
> > balloon: actual=36
> > 
> > At this moment I'm unable to connect by serial console to the guest
> > and the ssh sessions are freeze nevertheless kvm process of the
> > guest is running.  Using a VNC client I see several messages of this
> > type in the guest:
> > 
> > Out of memory: kill process xxxx (<name>) score xx or a child
> > Killed process xxxx (<name>)
> > 
> > Finally:
> > 
> > Kernel panic - not syncing - Out of memory and no killable processes...

> Hi Daniel,

Hi, Jim.

> I noticed no-one answered this, and I just ran into the same thing
> myself. As Avi pointed out earlier, it is a guest bug, and upgrading
> the guest to 2.6.27 should fix it:

>   http://www.mail-archive.com/kvm@vger.kernel.org/msg10849.html

In this moment I doesn't have Internet connectivity in my house, but, as
soon as it be possible, I shall download the necessary software to
compile 2.6.27 or superior and then I tell you the result of the tests.

Thanks for your reply. 

Regards,
Daniel
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