Re: [Xen-users] Dom0 Crashes on High I/O

["Ryan Burke" <burke@xxxxxxxxxxxxxxxxx>]

> I might be jinxing it by saying it - but I think that line in
> sysctl.conf has done it!
>
> The system always crashed previously when i was about 60% through the
> installation file setup for WinXP - i've done that again and admittedly
> the installer's not working properly (gets stuck at that 60% mark and
> qemu-dm on dom0 takes up 110% of cpu (4 cpus)) but importantly DOM0
> HASN'T CRASHED!
>
> I'm going to try some other operations that crash it regularly like
> creating new blank images with dd, i might even re-enable swap!
>
> Thanks! (Hopefully!)
>
> Henri
>
>
> Stefan de Konink wrote:
>>> Stefan de Konink wrote:
>>>
>>>>> Unless there has been a recent radical change to Xen it isn't
>>>>> possible
>>>>>
>>>> to overcommit memory like other virtualization systems.
>>>>
>>>> Trust me; this is totally unrelated to Xen and NFS problems were
>>>> already
>>>> causing this on 3.1.
>>>>
>>>>
>>>> Reproducable with:
>>>> Loopback file on NFS. Twice the size as the host ram.
>>>> Now run bonnie++. In a VM.
>>>>
>>> So, what are you saying? What are you recommending? Is there a bug
>>> filed somewhere that might apply here?
>>>
>>
>> I have mentioned it on xen-devel, and probably on bugzilla. And is one
>> of
>> the reasons to use iSCSI over NFS. Someone told me that it could be
>> fixed
>> by setting the memory overcommit for Linux to 'do not do it'. That is
>> some
>> setting in /etc/sysctl.conf
>>
>>
>> Stefan
>>

Mind telling the list what the changes you made were? Please let us know
if it fixed your problem as you continue your testing.

Ryan


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