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| author | mm <mm@FreeBSD.org> | 2010-05-01 20:44:37 +0000 |
|---|---|---|
| committer | mm <mm@FreeBSD.org> | 2010-05-01 20:44:37 +0000 |
| commit | 65cf7aac0b30cb9fd2148329b46e43e6f9c6f382 (patch) | |
| tree | 58f2aabbbc4db4ef94529da6396db03a8804cb59 | |
| parent | 54fb849ffcadd6a10a0953a595fd69fbc9693fea (diff) | |
| download | FreeBSD-src-65cf7aac0b30cb9fd2148329b46e43e6f9c6f382.zip FreeBSD-src-65cf7aac0b30cb9fd2148329b46e43e6f9c6f382.tar.gz | |
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
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c index 143b4b8..8650fa1 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/txg.c @@ -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, timeout, CTLFLAG_RDTUN, &zfs_txg_timeout, 0, 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. |
