diff options
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c | 15 | ||||
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c | 4 |
2 files changed, 19 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c index a3e2580..75cc6b1 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c @@ -158,6 +158,8 @@ static int arc_grow_retry = 60; */ static int arc_min_prefetch_lifespan; +extern int zfs_prefetch_disable; +extern int zfs_prefetch_enable; static int arc_dead; /* @@ -3549,6 +3551,19 @@ arc_init(void) mutex_init(&zfs_write_limit_lock, NULL, MUTEX_DEFAULT, NULL); #ifdef _KERNEL +#ifdef __i386__ + if (zfs_prefetch_enable != 1) { + printf("ZFS NOTICE: prefetch is disabled by default on i386" + " - add enable to tunable to change.\n" ); + zfs_prefetch_disable=1; + } +#endif + if ((((uint64_t)physmem * PAGESIZE) < (1ULL << 32)) && + (zfs_prefetch_enable != 1) && (zfs_prefetch_disable != 1)) { + printf("ZFS NOTICE: system has less than 4GB and prefetch enable is not set" + "... disabling.\n"); + zfs_prefetch_disable=1; + } /* Warn about ZFS memory and address space requirements. */ if (((uint64_t)physmem * PAGESIZE) < (256 + 128 + 64) * (1 << 20)) { printf("ZFS WARNING: Recommended minimum RAM size is 512MB; " diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c index 8dba381..3ff6f5e 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/dmu_zfetch.c @@ -38,6 +38,7 @@ */ int zfs_prefetch_disable = 0; +int zfs_prefetch_enable = 0; /* max # of streams per zfetch */ uint32_t zfetch_max_streams = 8; @@ -52,6 +53,9 @@ SYSCTL_DECL(_vfs_zfs); TUNABLE_INT("vfs.zfs.prefetch_disable", &zfs_prefetch_disable); SYSCTL_INT(_vfs_zfs, OID_AUTO, prefetch_disable, CTLFLAG_RDTUN, &zfs_prefetch_disable, 0, "Disable prefetch"); +TUNABLE_INT("vfs.zfs.prefetch_enable", &zfs_prefetch_enable); +SYSCTL_INT(_vfs_zfs, OID_AUTO, prefetch_enable, CTLFLAG_RDTUN, + &zfs_prefetch_enable, 0, "Enable prefetch for systems with less than 4GB"); SYSCTL_NODE(_vfs_zfs, OID_AUTO, zfetch, CTLFLAG_RW, 0, "ZFS ZFETCH"); TUNABLE_INT("vfs.zfs.zfetch.max_streams", &zfetch_max_streams); SYSCTL_UINT(_vfs_zfs_zfetch, OID_AUTO, max_streams, CTLFLAG_RDTUN, |
