KOSAKI Motohiro wrote: > IOW, My box didn't happend performance regression. > but I think it isn't typical. Well that is typical for small NUMA system. Maybe this patch will fix it for now? Large systems can be tuned by setting the ratio lower. Subject: slub/NUMA: Disable remote node defragmentation by default Switch remote node defragmentation off by default. The current settings can cause excessive node local allocations with hackbench. (Note that this feature is not related to slab defragmentation). Signed-off-by: Christoph Lameter <cl@xxxxxxxxxxxxxxxxxxxx> --- mm/slub.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) Index: linux-2.6/mm/slub.c =================================================================== --- linux-2.6.orig/mm/slub.c 2008-08-19 06:45:54.732348449 -0700 +++ linux-2.6/mm/slub.c 2008-08-19 06:46:12.442348249 -0700 @@ -2312,7 +2312,7 @@ static int kmem_cache_open(struct kmem_c s->refcount = 1; #ifdef CONFIG_NUMA - s->remote_node_defrag_ratio = 100; + s->remote_node_defrag_ratio = 1000; #endif if (!init_kmem_cache_nodes(s, gfpflags & ~SLUB_DMA)) goto error; @@ -4058,7 +4058,7 @@ static ssize_t remote_node_defrag_ratio_ if (err) return err; - if (ratio < 100) + if (ratio <= 100) s->remote_node_defrag_ratio = ratio * 10; return length; -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
