Author: mm
Date: Sat May 1 20:44:37 2010
New Revision: 207481
URL: http://svn.freebsd.org/changeset/base/207481
Log:
Add sysctl and loader tunable vfs.zfs.txg.write_limit_override.
This tunable improves fine-tuning of ZFS write throttling.
PR: kern/146108
Suggested by: Nikolay Denev <ndenev at gmail.com>
Approved by: pjd, delphij (mentor)
MFC after: 2 weeks
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c Sat May 1
19:53:15 2010 (r207480)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c Sat May 1
20:44:37 2010 (r207481)
@@ -38,6 +38,7 @@ static void txg_quiesce_thread(void *arg
int zfs_txg_timeout = 30; /* max seconds worth of delta per txg */
extern int zfs_txg_synctime;
+extern uint64_t zfs_write_limit_override;
SYSCTL_DECL(_vfs_zfs);
SYSCTL_NODE(_vfs_zfs, OID_AUTO, txg, CTLFLAG_RW, 0,
@@ -48,6 +49,11 @@ SYSCTL_INT(_vfs_zfs_txg, OID_AUTO, timeo
TUNABLE_INT("vfs.zfs.txg.synctime", &zfs_txg_synctime);
SYSCTL_INT(_vfs_zfs_txg, OID_AUTO, synctime, CTLFLAG_RDTUN, &zfs_txg_synctime,
0, "Target seconds to sync a txg");
+TUNABLE_QUAD("vfs.zfs.txg.write_limit_override", &zfs_write_limit_override);
+SYSCTL_QUAD(_vfs_zfs_txg, OID_AUTO, write_limit_override, CTLFLAG_RW,
+ &zfs_write_limit_override, 0,
+ "Override maximum size of a txg to this size in bytes, "
+ "value of 0 means don't override");
/*
* Prepare the txg subsystem.
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