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BRT: Make BRT block sizes configurable

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Similar to DDT make BRT data and indirect block sizes configurable
via module parameters.  I am not sure what would be the best yet,
but similar to DDT 4KB blocks kill all chances of compression on
vdev with ashift=12 or more, that on my tests reaches 3x.

While here, fix documentation for respective DDT parameters.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15967
This commit is contained in:
Alexander Motin 2024-03-25 18:02:38 -04:00 committed by GitHub
parent 493fcce9be
commit f68bde7236
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2 changed files with 26 additions and 13 deletions
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17
man/man4/zfs.4
View File

@ -244,12 +244,25 @@ For blocks that could be forced to be a gang block (due to
.Sy metaslab_force_ganging ) ,
force this many of them to be gang blocks.
.
.It Sy zfs_ddt_zap_default_bs Ns = Ns Sy 15 Po 32 KiB Pc Pq int
.It Sy brt_zap_prefetch Ns = Ns Sy 1 Ns | Ns 0 Pq int
Controls prefetching BRT records for blocks which are going to be cloned.
.
.It Sy brt_zap_default_bs Ns = Ns Sy 12 Po 4 KiB Pc Pq int
Default BRT ZAP data block size as a power of 2. Note that changing this after
creating a BRT on the pool will not affect existing BRTs, only newly created
ones.
.
.It Sy brt_zap_default_ibs Ns = Ns Sy 12 Po 4 KiB Pc Pq int
Default BRT ZAP indirect block size as a power of 2. Note that changing this
after creating a BRT on the pool will not affect existing BRTs, only newly
created ones.
.
.It Sy ddt_zap_default_bs Ns = Ns Sy 15 Po 32 KiB Pc Pq int
Default DDT ZAP data block size as a power of 2. Note that changing this after
creating a DDT on the pool will not affect existing DDTs, only newly created
ones.
.
.It Sy zfs_ddt_zap_default_ibs Ns = Ns Sy 15 Po 32 KiB Pc Pq int
.It Sy ddt_zap_default_ibs Ns = Ns Sy 15 Po 32 KiB Pc Pq int
Default DDT ZAP indirect block size as a power of 2. Note that changing this
after creating a DDT on the pool will not affect existing DDTs, only newly
created ones.

22
module/zfs/brt.c
View File

@ -248,7 +248,7 @@ static kmem_cache_t *brt_pending_entry_cache;
/*
* Enable/disable prefetching of BRT entries that we are going to modify.
*/
int zfs_brt_prefetch = 1;
static int brt_zap_prefetch = 1;
#ifdef ZFS_DEBUG
#define BRT_DEBUG(...) do { \
@ -260,8 +260,8 @@ int zfs_brt_prefetch = 1;
#define BRT_DEBUG(...) do { } while (0)
#endif
int brt_zap_leaf_blockshift = 12;
int brt_zap_indirect_blockshift = 12;
static int brt_zap_default_bs = 12;
static int brt_zap_default_ibs = 12;
static kstat_t *brt_ksp;
@ -458,8 +458,7 @@ brt_vdev_create(brt_t *brt, brt_vdev_t *brtvd, dmu_tx_t *tx)
brtvd->bv_mos_entries = zap_create_flags(brt->brt_mos, 0,
ZAP_FLAG_HASH64 | ZAP_FLAG_UINT64_KEY, DMU_OTN_ZAP_METADATA,
brt_zap_leaf_blockshift, brt_zap_indirect_blockshift, DMU_OT_NONE,
0, tx);
brt_zap_default_bs, brt_zap_default_ibs, DMU_OT_NONE, 0, tx);
VERIFY(brtvd->bv_mos_entries != 0);
BRT_DEBUG("MOS entries created, object=%llu",
(u_longlong_t)brtvd->bv_mos_entries);
@ -1363,7 +1362,7 @@ brt_prefetch(brt_t *brt, const blkptr_t *bp)
ASSERT(bp != NULL);
if (!zfs_brt_prefetch)
if (!brt_zap_prefetch)
return;
brt_entry_fill(bp, &bre, &vdevid);
@ -1679,9 +1678,10 @@ brt_unload(spa_t *spa)
}
/* BEGIN CSTYLED */
ZFS_MODULE_PARAM(zfs_brt, zfs_brt_, prefetch, INT, ZMOD_RW,
"Enable prefetching of BRT entries");
#ifdef ZFS_BRT_DEBUG
ZFS_MODULE_PARAM(zfs_brt, zfs_brt_, debug, INT, ZMOD_RW, "BRT debug");
#endif
ZFS_MODULE_PARAM(zfs_brt, , brt_zap_prefetch, INT, ZMOD_RW,
"Enable prefetching of BRT ZAP entries");
ZFS_MODULE_PARAM(zfs_brt, , brt_zap_default_bs, UINT, ZMOD_RW,
"BRT ZAP leaf blockshift");
ZFS_MODULE_PARAM(zfs_brt, , brt_zap_default_ibs, UINT, ZMOD_RW,
"BRT ZAP indirect blockshift");
/* END CSTYLED */