[Openstack] BUG: soft lockup messages

Matej Mailing mailing at tam.si
Tue Feb 3 11:01:38 UTC 2015

Hi Giacomo,

sorry for a late reply.

It turned out that the major improvement was made through increasing
NFS packet size from 8k to 32k.

After that no more of those messages were shown and everything is
working just great :-)

Thank you everyone for your suggestions and ideas again.


2015-01-13 15:30 GMT+01:00 Giacomo Tenaglia <Giacomo.Tenaglia at cern.ch>:
> On 09/01/15 13:01, Matej Mailing wrote:
>> we have tweaked some NFS parameters for our backend storage, including
>> packet sizes and now the load is constantly slower, there is much less
>> I/O waiting. There were no lock-ups after that. So it really seems it
>> was slow storage that was to be blamed. I will certainly report back
>> if the failures occur again.
> Hi Matej,
> could you elaborate more on the tweaks you implemented on your NFS servers,
> out of interest?
> Thanks,
> Giacomo
> --
> Giacomo Tenaglia
> CERN IT Department
> Systems Team - Database Group
> http://phonebook.cern.ch/#id=PE671909
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