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From: Alexander Motin <mav@FreeBSD.org>
Date: Thu, 12 Jun 2014 11:57:07 +0000 (UTC)
To: src-committers@freebsd.org, svn-src-all@freebsd.org,
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Subject: svn commit: r267391 - head/sys/vm
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Author: mav
Date: Thu Jun 12 11:57:07 2014
New Revision: 267391
URL: http://svnweb.freebsd.org/changeset/base/267391

Log:
  Introduce new "256 Bucket" zone to split requests and reduce congestion
  on "128 Bucket" zone lock.
  
  MFC after:	2 weeks
  Sponsored by:	iXsystems, Inc.

Modified:
  head/sys/vm/uma_core.c

Modified: head/sys/vm/uma_core.c
==============================================================================
--- head/sys/vm/uma_core.c	Thu Jun 12 11:44:26 2014	(r267390)
+++ head/sys/vm/uma_core.c	Thu Jun 12 11:57:07 2014	(r267391)
@@ -205,7 +205,7 @@ struct uma_bucket_zone {
 #define	BUCKET_SIZE(n)						\
     (((sizeof(void *) * (n)) - sizeof(struct uma_bucket)) / sizeof(void *))
 
-#define	BUCKET_MAX	BUCKET_SIZE(128)
+#define	BUCKET_MAX	BUCKET_SIZE(256)
 
 struct uma_bucket_zone bucket_zones[] = {
 	{ NULL, "4 Bucket", BUCKET_SIZE(4), 4096 },
@@ -216,6 +216,7 @@ struct uma_bucket_zone bucket_zones[] = 
 	{ NULL, "32 Bucket", BUCKET_SIZE(32), 512 },
 	{ NULL, "64 Bucket", BUCKET_SIZE(64), 256 },
 	{ NULL, "128 Bucket", BUCKET_SIZE(128), 128 },
+	{ NULL, "256 Bucket", BUCKET_SIZE(256), 64 },
 	{ NULL, NULL, 0}
 };