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malloc: tune thread cache

Message ID 1453767942-19369-33-git-send-email-joern@purestorage.com
State New
Headers show

Commit Message

Jörn Engel Jan. 26, 2016, 12:25 a.m. UTC 
Experiments have shown that prefetch of more than one object yields
diminishing returns and can even be harmful.  Growing the cache to 128k
yields much better results and should still be small enough.

JIRA: PURE-27597
---
 tpc/malloc2.13/tcache.h | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/tpc/malloc2.13/tcache.h b/tpc/malloc2.13/tcache.h
index 0ddee48a30dc..55bf3862af91 100644
--- a/tpc/malloc2.13/tcache.h
+++ b/tpc/malloc2.13/tcache.h
@@ -24,13 +24,13 @@  static inline int fls(int x)
  * arena.  On free we keep the freed object in hope of reusing it in
  * future allocations.
  */
-#define CACHE_SIZE_BITS		(16)
+#define CACHE_SIZE_BITS		(17)
 #define CACHE_SIZE		(1 << CACHE_SIZE_BITS)
 #define MAX_CACHED_SIZE_BITS	(CACHE_SIZE_BITS - 3)
 #define MAX_CACHED_SIZE		(1 << MAX_CACHED_SIZE_BITS)
 #define MAX_PREFETCH_SIZE_BITS	(CACHE_SIZE_BITS - 6)
 #define MAX_PREFETCH_SIZE	(1 << MAX_PREFETCH_SIZE_BITS)
-#define NO_PREFETCH		(1 << 3)
+#define NO_PREFETCH		(1)
 
 /*
  * Binning is done as a subdivided buddy allocator.  A buddy allocator