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SubjectRe: [RFC 0/6] the big khugepaged redesign
On 2015-03-05 18:01:08 +0100, Vlastimil Babka wrote:
> On 03/05/2015 05:52 PM, Andres Freund wrote:
> > What exactly counts as "recent" in this context? Most of the bigger
> > installations where we found THP to be absolutely prohibitive (slowdowns
> > on the order of a magnitude, huge latency spikes) unfortunately run
> > quite old kernels... I guess 3.11 does *not* count :/? That'd be a
>
> Yeah that's too old :/

Guessed so.

> I also noticed that you now support hugetlbfs. That could be also interesting
> data point, if the hugetlbfs usage helped because THP code wouldn't
> trigger.

Well, mmap(MAP_HUGETLB), but yea.

Will let you know once I know whether it's possible to get a newer kernel.

Greetings,

Andres Freund

--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services


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