From: David Teigland <teigland@redhat.com>
Subject: [RHEL5.1 PATCH] gfs2 (dlm): increase default lock limit
Date: Fri, 26 Jan 2007 11:54:24 -0600
Bugzilla: 224460
Message-Id: <20070126175424.GC18186@redhat.com>
Changelog: [dlm] increase default lock limit


bz 224460
(patch 1 of 2)

Increase the number of locks at which point the dlm begins asking gfs to
reduce its lock usage.  The default value is largely arbitrary, but the
current value of 50,000 ends up limiting performance unnecessarily for too
many users.

Because this is in lock_dlm, it also affects gfs1 since gfs1 uses gfs2's
lock modules in the upstream kernel.

patch in upstream gfs2 git tree


Index: linux-rhel5-quilt/fs/gfs2/locking/dlm/lock_dlm.h
===================================================================
--- linux-rhel5-quilt.orig/fs/gfs2/locking/dlm/lock_dlm.h	2007-01-24 14:42:04.000000000 -0600
+++ linux-rhel5-quilt/fs/gfs2/locking/dlm/lock_dlm.h	2007-01-25 14:27:25.000000000 -0600
@@ -36,7 +36,7 @@
 
 #define GDLM_STRNAME_BYTES	24
 #define GDLM_LVB_SIZE		32
-#define GDLM_DROP_COUNT		50000
+#define GDLM_DROP_COUNT		200000
 #define GDLM_DROP_PERIOD	60
 #define GDLM_NAME_LEN		128