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

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On Thu, Jun 23, 2016 at 9:01 AM, Yoann Moulin <yoann.moulin@xxxxxxx> wrote:
> Le 23/06/2016 08:25, Sarni Sofiane a écrit :
>> Hi Florian,
>>
>
>
>> On 23.06.16 06:25, "ceph-users on behalf of Florian Haas" <ceph-users-bounces@xxxxxxxxxxxxxx on behalf of florian@xxxxxxxxxxx> wrote:
>>
>>> 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?
>>
>> All the benchmarks were run on strictly identical hardware setups per node.
>> Clusters differ slightly in sizes (infernalis vs jewel) but nodes and OSDs are identical.
>
> One thing differ in the osd configuration, on the Jewel cluster, we have journal
> on disk, on the Infernalis cluster, we have journal on SSD (S3500)
>
> I can restart my test on a Jewel cluster with journal on SSD if needed.
> I can do as well a test on an Infernalis cluster with journal on disk.

I'd suggest that the second option is probably more meaningful to test.

What I find curious is that no-one else on the list has apparently run
into this. Any Ubuntu xenial users out there, or perhaps folks on
trusty who choose to install linux-image-generic-lts-xenial?

Cheers,
Florian
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