On Wed, Aug 18, 2010 at 11:58:25PM +0800, Chris Webb wrote: > Lee Schermerhorn <Lee.Schermerhorn@xxxxxx> writes: > > > On Wed, 2010-08-18 at 23:21 +0800, Wu Fengguang wrote: > > > Andi, Christoph and Lee: > > > > > > This looks like an "unbalanced NUMA memory usage leading to premature > > > swapping" problem. > > > > What is the value of the vm.zone_reclaim_mode sysctl? If it is !0, the > > system will go into zone reclaim before allocating off-node pages. > > However, it shouldn't "swap" in this case unless (zone_reclaim_mode & 4) > > != 0. And even then, zone reclaim should only reclaim file pages, not > > anon. In theory... > > Hi. This is zero on all our machines: > > # sysctl vm.zone_reclaim_mode > vm.zone_reclaim_mode = 0 Chris, can you post /proc/vmstat on the problem machines? Thanks, Fengguang -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>