Hi Todd

On 11/15/15 19:05, Fujinaka, Todd wrote:
> I looked at the issue and I may have missed the reason you need to update 
> your servers?
> 

Well, we run a heterogeneous set of servers (mainly four major kinds at
the moment) and try to stick to one kernel version for them all in order
to ease maintenance. And the newest machines have hardware not supported
on 3.2 kernels.

> First, we don't directly support Debian. I've seen some errors reported on 
> Debian that aren't reproducible even on Ubuntu, which should be similar. We 
> support RHEL n and n-1, and SLES n and n-1 which means the latest release and 
> the latest previous release (for RHEL that would be the latest in 6.x and 
> 7.x, for SLES the latest 12 and 11). We also support the stable Linux 
> kernels. The reason for the limits is that the distros often backport patches 
> to their kernel, making something unique.
>

First off, the differences between Ubuntu and Debian are to be expected
as Ubuntu usually draws from a mix of Debian testing and unstable and
thus may differ quite a bit from Debian stable.

That's also one reason we go for mostly vanilla kernels directly from
kernel.org and not from Debian proper. I.e. currently we are using
longterm supported 3.14 from kernel.org

> Second, the part you're referencing is EOLed and is receiving minimal support.
> 

Understood --- still I had hoped that this regression would have been
fixed since our first report almost four years ago.

> I would suggest staying with your working kernel. You could also try a 
> different OS, but that's just an experiment.

Different OS will not really work as we have (many) other constraints to
take into the picture, but I will check if we can move back to version
3.2 and hope that our cgroups related constraints are still satisfied.

Thanks a lot for the reply

Cheers

Carsten

-- 
Dr. Carsten Aulbert, Atlas cluster administration
Max Planck Institute for Gravitational Physics (Albert Einstein Institute)
Callinstraße 38, 30167 Hannover, Germany
Tel: +49 511 762 17185, Fax: +49 511 762 17193

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