On 08/02/2014 06:17 AM, Rik van Riel wrote:
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> On 08/01/2014 05:30 PM, Jirka Hladky wrote:
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>> I see the regression only on this box. It has 4 "Ivy Bridge-EX"
>> Xeon E7-4890 v2 CPUs.
>>
>> http://ark.intel.com/products/75251
>> http://en.wikipedia.org/wiki/List_of_Intel_Xeon_microprocessors#.22Ivy_Bridge-EX.22_.2822_nm.29_Expandable_2
>>
>>
>>
>> Please rerun the test on box with Ivy Bridge CPUs. It seems that
>> older CPU generations are not affected.
> That would have been good info to know :)
>
> I've been spending about a month trying to reproduce your issue on a
> Westmere E7-4860.
>
> Good thing I found all kinds of other scheduler issues along the way...

Hi Rik,

till recently I have seen the regression on all systems.

With the latest kernel, only Ivy Bridge system seems to be affected.

Jirka