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 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>