Hello,
I
got this error also by 384 MB (having 7 linux VMs and 1 W2K HVM on Xen 3.1.0
under Debian Etch Dom0), the oom-killer till now always selected the W2K
instance to kill...
I
think this is very dependent on the fact if the DOmU is on LVM and especially
if there is some snapshot of it – then If You for example copy by „dd“
the new image on such a partition, which has a snapshot, the LVM subsystem has
to allocate a lot of memory on the disk for the new blocks in snapshot and it
looks to lead to the given memory problem. If I dropped the snapshot partition
and used smaller blocksize in dd, it has been no problem.
Sure,
to have the snapshot of the partition which is going completely to be changed
is not goor, I just have forgotten to drop the snapshot I created for backup
purposes before...
I
have read somwhere, there can be prevented some process from beeing killed by
the oom-killer, but I do not know how to apply it to the given domain after it
has been started...
In
http://linux-mm.org/OOM_Killer there
is written „Any particular process leader may be
immunized against the oom killer if the value of it's /proc/<pid>/oomadj
is set to the constant OOM_DISABLE (currently defined as -17).“, but how can I
figure out which process is the process serving my DomU? And what can happen
with the LVM subsystem if the memory is not increased because no DomU can be
killed by oom-killer?
Does
anybody have experiences with it?
With
regards,
Archie
From: xen-users-bounces@xxxxxxxxxxxxxxxxxxx
[mailto:xen-users-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Eric Tessler
Sent: Friday, August 10, 2007 6:26 AM
To: Thomas Mueller; xen-users@xxxxxxxxxxxxxxxxxxx
Subject: Re: [Xen-users] OOM killer observed during heavy I/O from VMs
(XEN3.0.4 and XEN 3.1)
Can you send me your OOM killer
output from /var/log/messages - I want to see if it's the same one that I am
hitting.
If we increase our memory to
384MB of higher, we don't get the OOM killer - at least we have not seen it yet
(we want to keep dom0 to 256MB).
Eric
Thomas Mueller <tmu@xxxxxxxxxxxx> wrote:
hi there
> Under both XEN 3.0.4 (2.6.16.33) and XEN 3.1 (2.6.18), I can make the
OOM killer
> appear in dom0 of my server by doing heavy I/O from within a
> VM.
just wanted to say, that i'm facing probably the same problem with XEN
3.1 and 256MB RAM in dom0. I also had this with 512MB but not so often.
Sometimes this happens if i "dd" a new file-image (10GB) in dom0.
- Thomas
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