lkml.org 
[lkml]   [2008]   [Aug]   [19]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: No, really, stop trying to delete slab until you've finished making slub perform as well
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@linux-foundation.org>

---
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;

\
 
 \ /
  Last update: 2008-08-19 15:55    [W:0.091 / U:8.180 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site