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| author | pjd <pjd@FreeBSD.org> | 2012-01-20 22:04:59 +0000 |
|---|---|---|
| committer | pjd <pjd@FreeBSD.org> | 2012-01-20 22:04:59 +0000 |
| commit | 39957b7340f1e5781191b7b97b4fb30eafd9b7f3 (patch) | |
| tree | 0ca008e62dcbac42c1f0710cf20d158e4b788167 | |
| parent | 62f2fd64bb9bb613ca366ff4cd1c0f3d6338113c (diff) | |
| download | FreeBSD-src-39957b7340f1e5781191b7b97b4fb30eafd9b7f3.zip FreeBSD-src-39957b7340f1e5781191b7b97b4fb30eafd9b7f3.tar.gz | |
By default turn off prefetch when listing snapshots.
In my tests it makes listing snapshots 19% faster with cold cache and
47% faster with warm cache.
MFC after: 1 week
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c index 882bf02e..fa09170 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zfs_ioctl.c @@ -81,6 +81,12 @@ CTASSERT(sizeof(zfs_cmd_t) < IOCPARM_MAX); +static int snapshot_list_prefetch; +SYSCTL_DECL(_vfs_zfs); +TUNABLE_INT("vfs.zfs.snapshot_list_prefetch", &snapshot_list_prefetch); +SYSCTL_INT(_vfs_zfs, OID_AUTO, snapshot_list_prefetch, CTLFLAG_RW, + &snapshot_list_prefetch, 0, "Prefetch data when listing snapshots"); + static struct cdev *zfsdev; extern void zfs_init(void); @@ -2044,7 +2050,7 @@ zfs_ioc_snapshot_list_next(zfs_cmd_t *zc) int error; top: - if (zc->zc_cookie == 0) + if (snapshot_list_prefetch && zc->zc_cookie == 0) (void) dmu_objset_find(zc->zc_name, dmu_objset_prefetch, NULL, DS_FIND_SNAPSHOTS); |
