Strange load issue with 2.4.17

[Sebastian Hagedorn]

--On 13. Oktober 2014 17:39:23 +0200 Simon Matter <simon.matter at invoca.ch> 
wrote:

>> --On 13. Oktober 2014 17:35:25 +0200 Simon Matter
>> <simon.matter at invoca.ch> wrote:
>>
>>>> Hi,
>>>>
>>>> for the last week we have seen strange load issues on our Cyrus server.
>>>> All
>>>> of a sudden the load increases to several thousands, user CPU goes down
>>>> to basically zero, system CPU spikes. In the past we've had trouble
>>>> with
>>>> poor I/O performance, but that went along with an increase in Wait I/O.
>>>> We don't
>>>> see that now. vmstat shows a massive increase in context switches. When
>>>> the
>>>> system reaches this state, all we can do is restart Cyrus or reboot the
>>>> machine if that doesn't work anymore.
>>>>
>>>> I'm attaching a Ganglia screenshot that shows the problem clearly. When
>>>> the
>>>> problem exists, there's not much we can do to analyze it. A colleague
>>>> suggested that what we see could be related to this bug:
>>>>
>>>> https://bugzilla.cyrusimap.org/show_bug.cgi?id=3744
>>>>
>>>> It was reported for 2.4.16, and it sounds as if it has been fixed, but
>>>> is
>>>> that fix really part of 2.4.17? Any other ideas?
>>>
>>> Is this a physical host or running virtualized?
>>
>> It's virtualized, but it's been that way for more than a year.
>
> Is this by any chance running on KVM, maybe on an AMD cpu?

No, it's VMware ESX on Intel CPUs.
-- 
    .:.Sebastian Hagedorn - Weyertal 121 (Gebäude 133), Zimmer 2.02.:.
                 .:.Regionales Rechenzentrum (RRZK).:.
   .:.Universität zu Köln / Cologne University - ✆ +49-221-470-89578.:.
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