[Users] Fedora 20

[Itamar Heim]

On 11/24/2013 06:28 PM, Markus Stockhausen wrote:
>> Von: Itamar Heim [iheim at redhat.com]
>> Gesendet: Sonntag, 24. November 2013 11:54
>> An: Markus Stockhausen; users at ovirt.org
>> Betreff: Re: AW: [Users] Fedora 20
>>>
>>> Being on a current kernel in the hypervisor just gives a better
>>> feeling in a 10GBit NFS environment. That comes from several
>>> "would-have-been-nice-to-have-that-optimization-option"
>>> experiences.
>>>
>>
>> interesting. i assume you mean for the client machines, rather than the
>> NFS server.
>> to learn a bit more on this - do you have some examples of such
>> optimizations which are in latest fedora but not in say, el6.5 kernel?
>>
>
> The feeling is not related to a current comparison but to past
> situations where a new linux kernel provided some nice feature
> to squeeze more performance out of the existing infrastructure.
> We have a lot of SAP test/demo systems that are usually >100GB.
> Moving data around or (un)loading databases can be quite a
> headache. Especially with respect to other running systems.
> Some examples that were helpful in our environment:
>
> - bufferbloat fighting patches (3.6 and on)
>
> - Using SMBv2 client in the kernel (since 3.7).  E.g. direct
> access to a windows share on the hypervisor
>
> - perf patches for better bottleneck analysis
>
> Going with Ovirt and the possibility to do more things online
> (relocating VMs and their disks) may reduce the requirement
> for the newest kernel version.
>
> So starting with Fedora 19 on the nodes and a more stable CentOS
> on the engine could be a good tradeoff. What do you think?

sounds like a plan. though make sure your nodes have same version. I 
doubt fedora spends too many cycles on things like stress testing say, 
live migration, between different versions.