diff options
Diffstat (limited to 'sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c')
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c | 100 |
1 files changed, 59 insertions, 41 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c index ffcb8a465216..fd694b833782 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/vdev.c @@ -163,34 +163,34 @@ static vdev_ops_t *vdev_ops_table[] = { }; -/* target number of metaslabs per top-level vdev */ -int vdev_max_ms_count = 200; -SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, max_ms_count, CTLFLAG_RWTUN, - &vdev_max_ms_count, 0, +/* default target for number of metaslabs per top-level vdev */ +int zfs_vdev_default_ms_count = 200; +SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, default_ms_count, CTLFLAG_RWTUN, + &zfs_vdev_default_ms_count, 0, "Target number of metaslabs per top-level vdev"); /* minimum number of metaslabs per top-level vdev */ -int vdev_min_ms_count = 16; +int zfs_vdev_min_ms_count = 16; SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, min_ms_count, CTLFLAG_RWTUN, - &vdev_min_ms_count, 0, + &zfs_vdev_min_ms_count, 0, "Minimum number of metaslabs per top-level vdev"); /* practical upper limit of total metaslabs per top-level vdev */ -int vdev_ms_count_limit = 1ULL << 17; +int zfs_vdev_ms_count_limit = 1ULL << 17; SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, max_ms_count_limit, CTLFLAG_RWTUN, - &vdev_ms_count_limit, 0, + &zfs_vdev_ms_count_limit, 0, "Maximum number of metaslabs per top-level vdev"); /* lower limit for metaslab size (512M) */ -int vdev_default_ms_shift = 29; +int zfs_vdev_default_ms_shift = 29; SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, default_ms_shift, CTLFLAG_RWTUN, - &vdev_default_ms_shift, 0, + &zfs_vdev_default_ms_shift, 0, "Default shift between vdev size and number of metaslabs"); -/* upper limit for metaslab size (256G) */ -int vdev_max_ms_shift = 38; +/* upper limit for metaslab size (16G) */ +int zfs_vdev_max_ms_shift = 34; SYSCTL_INT(_vfs_zfs_vdev, OID_AUTO, max_ms_shift, CTLFLAG_RWTUN, - &vdev_max_ms_shift, 0, + &zfs_vdev_max_ms_shift, 0, "Maximum shift between vdev size and number of metaslabs"); boolean_t vdev_validate_skip = B_FALSE; @@ -2205,16 +2205,24 @@ void vdev_metaslab_set_size(vdev_t *vd) { uint64_t asize = vd->vdev_asize; - uint64_t ms_count = asize >> vdev_default_ms_shift; + uint64_t ms_count = asize >> zfs_vdev_default_ms_shift; uint64_t ms_shift; /* * There are two dimensions to the metaslab sizing calculation: * the size of the metaslab and the count of metaslabs per vdev. - * In general, we aim for vdev_max_ms_count (200) metaslabs. The - * range of the dimensions are as follows: * - * 2^29 <= ms_size <= 2^38 + * The default values used below are a good balance between memory + * usage (larger metaslab size means more memory needed for loaded + * metaslabs; more metaslabs means more memory needed for the + * metaslab_t structs), metaslab load time (larger metaslabs take + * longer to load), and metaslab sync time (more metaslabs means + * more time spent syncing all of them). + * + * In general, we aim for zfs_vdev_default_ms_count (200) metaslabs. + * The range of the dimensions are as follows: + * + * 2^29 <= ms_size <= 2^34 * 16 <= ms_count <= 131,072 * * On the lower end of vdev sizes, we aim for metaslabs sizes of @@ -2223,35 +2231,41 @@ vdev_metaslab_set_size(vdev_t *vd) * of at least 16 metaslabs will override this minimum size goal. * * On the upper end of vdev sizes, we aim for a maximum metaslab - * size of 256GB. However, we will cap the total count to 2^17 - * metaslabs to keep our memory footprint in check. + * size of 16GB. However, we will cap the total count to 2^17 + * metaslabs to keep our memory footprint in check and let the + * metaslab size grow from there if that limit is hit. * * The net effect of applying above constrains is summarized below. * - * vdev size metaslab count - * -------------|----------------- - * < 8GB ~16 - * 8GB - 100GB one per 512MB - * 100GB - 50TB ~200 - * 50TB - 32PB one per 256GB - * > 32PB ~131,072 - * ------------------------------- + * vdev size metaslab count + * --------------|----------------- + * < 8GB ~16 + * 8GB - 100GB one per 512MB + * 100GB - 3TB ~200 + * 3TB - 2PB one per 16GB + * > 2PB ~131,072 + * -------------------------------- + * + * Finally, note that all of the above calculate the initial + * number of metaslabs. Expanding a top-level vdev will result + * in additional metaslabs being allocated making it possible + * to exceed the zfs_vdev_ms_count_limit. */ - if (ms_count < vdev_min_ms_count) - ms_shift = highbit64(asize / vdev_min_ms_count); - else if (ms_count > vdev_max_ms_count) - ms_shift = highbit64(asize / vdev_max_ms_count); + if (ms_count < zfs_vdev_min_ms_count) + ms_shift = highbit64(asize / zfs_vdev_min_ms_count); + else if (ms_count > zfs_vdev_default_ms_count) + ms_shift = highbit64(asize / zfs_vdev_default_ms_count); else - ms_shift = vdev_default_ms_shift; + ms_shift = zfs_vdev_default_ms_shift; if (ms_shift < SPA_MAXBLOCKSHIFT) { ms_shift = SPA_MAXBLOCKSHIFT; - } else if (ms_shift > vdev_max_ms_shift) { - ms_shift = vdev_max_ms_shift; + } else if (ms_shift > zfs_vdev_max_ms_shift) { + ms_shift = zfs_vdev_max_ms_shift; /* cap the total count to constrain memory footprint */ - if ((asize >> ms_shift) > vdev_ms_count_limit) - ms_shift = highbit64(asize / vdev_ms_count_limit); + if ((asize >> ms_shift) > zfs_vdev_ms_count_limit) + ms_shift = highbit64(asize / zfs_vdev_ms_count_limit); } vd->vdev_ms_shift = ms_shift; @@ -3611,13 +3625,17 @@ vdev_accessible(vdev_t *vd, zio_t *zio) boolean_t vdev_is_spacemap_addressable(vdev_t *vd) { + if (spa_feature_is_active(vd->vdev_spa, SPA_FEATURE_SPACEMAP_V2)) + return (B_TRUE); + /* - * Assuming 47 bits of the space map entry dedicated for the entry's - * offset (see description in space_map.h), we calculate the maximum - * address that can be described by a space map entry for the given - * device. + * If double-word space map entries are not enabled we assume + * 47 bits of the space map entry are dedicated to the entry's + * offset (see SM_OFFSET_BITS in space_map.h). We then use that + * to calculate the maximum address that can be described by a + * space map entry for the given device. */ - uint64_t shift = vd->vdev_ashift + 47; + uint64_t shift = vd->vdev_ashift + SM_OFFSET_BITS; if (shift >= 63) /* detect potential overflow */ return (B_TRUE); |