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

[Henri Cook <henri@xxxxxxxxxxxxxxxxxxxxx>]

Looked hopeful for a while but unfortunately that has not fixed the
issue, thanks anyway.

Henri


Henri Cook wrote:
> 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
>>
>> ps. remove the annoying signature
>>
>>
>> _______________________________________________
>> Xen-users mailing list
>> Xen-users@xxxxxxxxxxxxxxxxxxx
>> http://lists.xensource.com/xen-users
>>   
>>     
>
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>   

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