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e71cade67d
mirror_zfs/module/zfs
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chrisrd e71cade67d Scale the dbuf cache with arc_c 
Commit d3c2ae1 introduced a dbuf cache with a default size of the
minimum of 100M or 1/32 maximum ARC size. (These figures may be adjusted
using dbuf_cache_max_bytes and dbuf_cache_max_shift.) The dbuf cache
is counted as metadata for the purposes of ARC size calculations.

On a 1GB box the ARC maximum size defaults to c_max 493M which gives a
dbuf cache default minimum size of 15.4M, and the ARC metadata defaults
to minimum 16M. I.e. the dbuf cache is an significant proportion of the
minimum metadata size. With other overheads involved this actually means
the ARC metadata doesn't get down to the minimum.

This patch dynamically scales the dbuf cache to the target ARC size
instead of statically scaling it to the maximum ARC size. (The scale is
still set by dbuf_cache_max_shift and the maximum size is still fixed by
dbuf_cache_max_bytes.) Using the target ARC size rather than the current
ARC size is done to help the ARC reach the target rather than simply
focusing on the current size.

Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Chris Dunlop <chris@onthe.net.au>
Issue #6506 
Closes #6561
2017-09-29 15:49:19 -07:00
..
abd.c minor improvement to abd_free_pages() 2017-05-02 10:06:18 -07:00
arc.c Scale the dbuf cache with arc_c 2017-09-29 15:49:19 -07:00
blkptr.c Use SET_ERROR for constant non-zero return codes 2017-08-02 21:16:12 -07:00
bplist.c
bpobj.c Don't dirty bpobj if it has no entries 2017-05-26 11:42:10 -07:00
bptree.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
bqueue.c Call cv_signal() with mutex held 2017-06-26 14:36:49 -07:00
dbuf_stats.c Improved dnode allocation and dmu_hold_impl() 2017-09-05 16:15:04 -07:00
dbuf.c Scale the dbuf cache with arc_c 2017-09-29 15:49:19 -07:00
ddt_zap.c
ddt.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dmu_diff.c
dmu_object.c Improved dnode allocation and dmu_hold_impl() 2017-09-05 16:15:04 -07:00
dmu_objset.c dmu_objset: release bonus buffer in failure path 2017-08-30 12:09:18 -07:00
dmu_send.c Revert "Handle new dnode size in incremental..." 2017-09-07 10:00:54 -07:00
dmu_traverse.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dmu_tx.c Export symbol dmu_tx_mark_netfree() 2017-09-20 09:30:24 -07:00
dmu_zfetch.c
dmu.c Send / Recv Fixes following b52563 2017-08-23 16:54:24 -07:00
dnode_sync.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dnode.c Improved dnode allocation and dmu_hold_impl() 2017-09-05 16:15:04 -07:00
dsl_bookmark.c OpenZFS 8377 - Panic in bookmark deletion 2017-06-30 11:11:01 -07:00
dsl_crypt.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dsl_dataset.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dsl_deadlist.c OpenZFS 5428 - provide fts(), reallocarray(), and strtonum() 2017-07-08 20:35:35 -07:00
dsl_deleg.c
dsl_destroy.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dsl_dir.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dsl_pool.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dsl_prop.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
dsl_scan.c OpenZFS 8414 - Implemented zpool scrub pause/resume 2017-08-24 10:27:20 -07:00
dsl_synctask.c
dsl_userhold.c OpenZFS 5428 - provide fts(), reallocarray(), and strtonum() 2017-07-08 20:35:35 -07:00
edonr_zfs.c
fm.c Use SET_ERROR for constant non-zero return codes 2017-08-02 21:16:12 -07:00
gzip.c GZIP compression offloading with QAT accelerator 2017-03-22 17:58:47 -07:00
lz4.c Fix LZ4_uncompress_unknownOutputSize caused panic 2017-05-19 13:45:46 -07:00
lzjb.c
Makefile.in Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
metaslab.c OpenZFS 8023 - Panic destroying a metaslab deferred range tree 2017-04-09 16:12:35 -07:00
mmp.c Reimplement vdev_random_leaf and rename it 2017-09-22 14:29:26 -07:00
multilist.c OpenZFS 7968 - multi-threaded spa_sync() 2017-03-20 18:36:00 -07:00
pathname.c
policy.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
qat_compress.c Change U16 to U32 due to atomic_inc_32_nv 2017-04-25 17:41:58 -07:00
qat_compress.h GZIP compression offloading with QAT accelerator 2017-03-22 17:58:47 -07:00
range_tree.c
refcount.c Linux 4.11 compat: avoid refcount_t name conflict 2017-02-28 16:10:18 -08:00
rrwlock.c
sa.c OpenZFS 8061 - sa_find_idx_tab can be declared more type-safely 2017-04-14 11:11:28 -07:00
sha256.c
skein_zfs.c
spa_boot.c
spa_config.c Fix false config_cache_write events 2017-09-11 10:25:01 -07:00
spa_errlog.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
spa_history.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
spa_misc.c vdev_mirror: kstat observables for preferred vdev 2017-08-21 10:05:54 -07:00
spa_stats.c Allow longer SPA names in stats 2017-08-11 08:56:24 -07:00
spa.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
space_map.c OpenZFS 8023 - Panic destroying a metaslab deferred range tree 2017-04-09 16:12:35 -07:00
space_reftree.c OpenZFS 6328 - Fix cstyle errors in zfs codebase 2017-01-12 09:42:11 -08:00
trace.c
txg.c Simplify threads, mutexs, cvs and rwlocks 2017-08-11 08:51:44 -07:00
uberblock.c Multi-modifier protection (MMP) 2017-07-13 13:54:00 -04:00
unique.c
vdev_cache.c Fix wrong offset args in vdev_cache_write 2017-03-28 11:06:22 -07:00
vdev_disk.c Fix printk() calls missing log level 2017-09-25 10:38:27 -07:00
vdev_file.c Skip spurious resilver IO on raidz vdev 2017-05-12 17:28:03 -07:00
vdev_label.c Use SET_ERROR for constant non-zero return codes 2017-08-02 21:16:12 -07:00
vdev_mirror.c vdev_mirror: kstat observables for preferred vdev 2017-08-21 10:05:54 -07:00
vdev_missing.c Skip spurious resilver IO on raidz vdev 2017-05-12 17:28:03 -07:00
vdev_queue.c vdev_mirror: load balancing fixes 2017-08-21 10:05:16 -07:00
vdev_raidz_math_aarch64_neon_common.h
vdev_raidz_math_aarch64_neon.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math_aarch64_neonx2.c
vdev_raidz_math_avx2.c
vdev_raidz_math_avx512bw.c
vdev_raidz_math_avx512f.c
vdev_raidz_math_impl.h codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math_scalar.c
vdev_raidz_math_sse2.c
vdev_raidz_math_ssse3.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz_math.c codebase style improvements for OpenZFS 6459 port 2017-01-22 13:25:40 -08:00
vdev_raidz.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
vdev_root.c Skip spurious resilver IO on raidz vdev 2017-05-12 17:28:03 -07:00
vdev.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
zap_leaf.c Use SET_ERROR for constant non-zero return codes 2017-08-02 21:16:12 -07:00
zap_micro.c Fix dnode allocation race 2017-08-08 08:38:53 -07:00
zap.c Use SET_ERROR for constant non-zero return codes 2017-08-02 21:16:12 -07:00
zfeature.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
zfs_acl.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
zfs_byteswap.c
zfs_ctldir.c Use SET_ERROR for constant non-zero return codes 2017-08-02 21:16:12 -07:00
zfs_debug.c Add line info and SET_ERROR() to ZFS debug log 2017-07-25 23:09:48 -07:00
zfs_dir.c Rename zfs_sb_t -> zfsvfs_t 2017-03-10 09:51:33 -08:00
zfs_fm.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
zfs_fuid.c Rename zfs_sb_t -> zfsvfs_t 2017-03-10 09:51:33 -08:00
zfs_ioctl.c Retire send space estimation via ZFS_IOC_SEND 2017-08-31 09:00:35 -07:00
zfs_log.c OpenZFS 7578 - Fix/improve some aspects of ZIL writing 2017-06-09 09:15:37 -07:00
zfs_onexit.c
zfs_ratelimit.c Add libtpool (thread pools) 2017-08-09 15:31:08 -07:00
zfs_replay.c Enhance comments for large dnode project 2017-08-29 09:00:28 -07:00
zfs_rlock.c
zfs_sa.c Modifying XATTRs doesnt change the ctime 2017-09-13 12:20:07 -07:00
zfs_vfsops.c Fix remounting snapshots read-write 2017-08-17 14:28:17 -07:00
zfs_vnops.c Correct cppcheck errors 2017-09-19 12:17:29 -07:00
zfs_znode.c misc: fix meaningless values 2017-09-19 12:19:08 -07:00
zil.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
zio_checksum.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
zio_compress.c
zio_crypt.c Native Encryption for ZFS on Linux 2017-08-14 10:36:48 -07:00
zio_inject.c Add corruption failure option to zinject(8) 2017-08-14 15:17:15 -07:00
zio.c Add corruption failure option to zinject(8) 2017-08-14 15:17:15 -07:00
zle.c
zpl_ctldir.c Linux 4.12 compat: CURRENT_TIME removed 2017-05-10 09:30:48 -07:00
zpl_export.c
zpl_file.c misc: fix meaningless values 2017-09-19 12:19:08 -07:00
zpl_inode.c Linux 4.12 compat: CURRENT_TIME removed 2017-05-10 09:30:48 -07:00
zpl_super.c Restructure mount option handling 2017-03-10 09:51:41 -08:00
zpl_xattr.c Modifying XATTRs doesnt change the ctime 2017-09-13 12:20:07 -07:00
zrlock.c OpenZFS 3746 - ZRLs are racy 2017-01-23 10:35:58 -08:00
zvol.c Linux 3.14 compat: IO acct, global_page_state, etc 2017-09-16 11:00:19 -07:00