Messages in this thread | | | Date | Thu, 5 Mar 2015 18:07:52 +0100 | From | Andres Freund <> | Subject | Re: [RFC 0/6] the big khugepaged redesign |
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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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