On Fri, Jul 24, 2015 at 08:59:59AM +0200, Michal Hocko wrote: > On Thu 23-07-15 14:54:31, Spencer Baugh wrote: > > From: Joern Engel <joern@xxxxxxxxx> > > > > ~150ms scheduler latency for both observed in the wild. > > This is way to vague. Could you describe your problem somehow more, > please? > There are schduling points in the page allocator (when it triggers the > reclaim), why are those not sufficient? Or do you manage to allocate > many hugetlb pages without performing the reclaim and that leads to > soft lockups? We don't use transparent hugepages - they cause too much latency. Instead we reserve somewhere around 3/4 or so of physical memory for hugepages. "sysctl -w vm.nr_hugepages=100000" or something similar in a startup script. Since it is early in boot we don't go through page reclaim. Jörn -- Everything should be made as simple as possible, but not simpler. -- Albert Einstein -- 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>