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| author | George Wilson <george.wilson@delphix.com> | 2017-03-15 09:06:24 -0400 |
|---|---|---|
| committer | Prakash Surya <prakash.surya@delphix.com> | 2018-03-21 08:24:55 -0700 |
| commit | 268bbb2a2fa79c36d4695d13a595ba50a7754b76 (patch) | |
| tree | d8971144a64ad4ec1f32543fe107f86c9e49668e | |
| parent | 9be12bd737714550277bd02b0c693db560976990 (diff) | |
| download | illumos-joyent-268bbb2a2fa79c36d4695d13a595ba50a7754b76.tar.gz | |
9188 increase size of dbuf cache to reduce indirect block decompression
Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Prashanth Sreenivasa <pks@delphix.com>
Reviewed by: Paul Dagnelie <pcd@delphix.com>
Reviewed by: Sanjay Nadkarni <sanjay.nadkarni@nexenta.com>
Reviewed by: Allan Jude <allanjude@freebsd.org>
Reviewed by: Igor Kozhukhov <igor@dilos.org>
Approved by: Garrett D'Amore <garrett@damore.org>
| -rw-r--r-- | usr/src/uts/common/fs/zfs/dbuf.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/usr/src/uts/common/fs/zfs/dbuf.c b/usr/src/uts/common/fs/zfs/dbuf.c index e620f9c278..2863c90cd3 100644 --- a/usr/src/uts/common/fs/zfs/dbuf.c +++ b/usr/src/uts/common/fs/zfs/dbuf.c @@ -85,10 +85,10 @@ static boolean_t dbuf_evict_thread_exit; */ static multilist_t *dbuf_cache; static refcount_t dbuf_cache_size; -uint64_t dbuf_cache_max_bytes = 100 * 1024 * 1024; +uint64_t dbuf_cache_max_bytes = 0; -/* Cap the size of the dbuf cache to log2 fraction of arc size. */ -int dbuf_cache_max_shift = 5; +/* Set the default size of the dbuf cache to log2 fraction of arc size. */ +int dbuf_cache_shift = 5; /* * The dbuf cache uses a three-stage eviction policy: @@ -600,11 +600,15 @@ retry: mutex_init(&h->hash_mutexes[i], NULL, MUTEX_DEFAULT, NULL); /* - * Setup the parameters for the dbuf cache. We cap the size of the - * dbuf cache to 1/32nd (default) of the size of the ARC. + * Setup the parameters for the dbuf cache. We set the size of the + * dbuf cache to 1/32nd (default) of the size of the ARC. If the value + * has been set in /etc/system and it's not greater than the size of + * the ARC, then we honor that value. */ - dbuf_cache_max_bytes = MIN(dbuf_cache_max_bytes, - arc_max_bytes() >> dbuf_cache_max_shift); + if (dbuf_cache_max_bytes == 0 || + dbuf_cache_max_bytes >= arc_max_bytes()) { + dbuf_cache_max_bytes = arc_max_bytes() >> dbuf_cache_shift; + } /* * All entries are queued via taskq_dispatch_ent(), so min/maxalloc |