Re: performance issue with jewel on ubuntu xenial (kernel)

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On Wed, Jun 22, 2016 at 10:56 AM, Yoann Moulin <yoann.moulin@xxxxxxx> wrote:
> Hello Florian,
>
>> On Tue, Jun 21, 2016 at 3:11 PM, Yoann Moulin <yoann.moulin@xxxxxxx> wrote:
>>> Hello,
>>>
>>> I found a performance drop between kernel 3.13.0-88 (default kernel on Ubuntu
>>> Trusty 14.04) and kernel 4.4.0.24.14 (default kernel on Ubuntu Xenial 16.04)
>>>
>>> ceph version is Jewel (10.2.2).
>>> All tests have been done under Ubuntu 14.04
>>
>> Knowing that you also have an internalis cluster on almost identical
>> hardware, can you please let the list know whether you see the same
>> behavior (severely reduced throughput on a 4.4 kernel, vs. 3.13) on
>> that cluster as well?
>
> ceph version is infernalis (9.2.0)
>
> Ceph osd Benchmark:
>
> Kernel 3.13.0-88-generic : ceph tell osd.ID => average ~84MB/s
> Kernel 4.2.0-38-generic  : ceph tell osd.ID => average ~90MB/s
> Kernel 4.4.0-24-generic  : ceph tell osd.ID => average ~75MB/s
>
> The slow down is not as much as I have with Jewel but it is still present.

But this is not on precisely identical hardware, is it?

Cheers,
Florian
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