diff options
Diffstat (limited to 'man')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 61 |
1 files changed, 41 insertions, 20 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index d94d6b395..39918e903 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -12,7 +12,7 @@ .\" CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your .\" own identifying information: .\" Portions Copyright [yyyy] [name of copyright owner] -.TH ZFS-MODULE-PARAMETERS 5 "Sept 28, 2017" +.TH ZFS-MODULE-PARAMETERS 5 "Oct 28, 2017" .SH NAME zfs\-module\-parameters \- ZFS module parameters .SH DESCRIPTION @@ -486,10 +486,11 @@ Default value: \fB10\fR. \fBzfs_arc_grow_retry\fR (int) .ad .RS 12n -After a memory pressure event the ARC will wait this many seconds before trying -to resume growth +If set to a non zero value, it will replace the arc_grow_retry value with this value. +The arc_grow_retry value (default 5) is the number of seconds the ARC will wait before +trying to resume growth after a memory pressure event. .sp -Default value: \fB5\fR. +Default value: \fB0\fR. .RE .sp @@ -523,6 +524,20 @@ Default value: \fB0\fR. .sp .ne 2 .na +\fBzfs_arc_meta_adjust_restarts\fR (ulong) +.ad +.RS 12n +The number of restart passes to make while scanning the ARC attempting +the free buffers in order to stay below the \fBzfs_arc_meta_limit\fR. +This value should not need to be tuned but is available to facilitate +performance analysis. +.sp +Default value: \fB4096\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_arc_meta_limit\fR (ulong) .ad .RS 12n @@ -585,15 +600,15 @@ Default value: \fB10,000\fR. .sp .ne 2 .na -\fBzfs_arc_meta_adjust_restarts\fR (ulong) +\fBzfs_arc_meta_strategy\fR (int) .ad .RS 12n -The number of restart passes to make while scanning the ARC attempting -the free buffers in order to stay below the \fBzfs_arc_meta_limit\fR. -This value should not need to be tuned but is available to facilitate -performance analysis. +Define the strategy for ARC meta data buffer eviction (meta reclaim strategy). +A value of 0 (META_ONLY) will evict only the ARC meta data buffers. +A value of 1 (BALANCED) indicates that additional data buffers may be evicted if +that is required to in order to evict the required number of meta data buffers. .sp -Default value: \fB4096\fR. +Default value: \fB1\fR. .RE .sp @@ -602,9 +617,10 @@ Default value: \fB4096\fR. \fBzfs_arc_min\fR (ulong) .ad .RS 12n -Min arc size +Min arc size of ARC in bytes. If set to 0 then arc_c_min will default to +consuming the larger of 32M or 1/32 of total system memory. .sp -Default value: \fB100\fR. +Default value: \fB0\fR. .RE .sp @@ -661,9 +677,12 @@ Default value: \fB8\fR. \fBzfs_arc_p_min_shift\fR (int) .ad .RS 12n -arc_c shift to calc min/max arc_p +If set to a non zero value, this will update arc_p_min_shift (default 4) +with the new value. +arc_p_min_shift is used to shift of arc_c for calculating both min and max +max arc_p .sp -Default value: \fB4\fR. +Default value: \fB0\fR. .RE .sp @@ -694,9 +713,10 @@ Use \fB1\fR for yes (default) and \fB0\fR to disable. \fBzfs_arc_shrink_shift\fR (int) .ad .RS 12n -log2(fraction of arc to reclaim) +If set to a non zero value, this will update arc_shrink_shift (default 7) +with the new value. .sp -Default value: \fB5\fR. +Default value: \fB0\fR. .RE .sp @@ -1778,7 +1798,7 @@ Default value: \fB32\fR. Historical statistics for the last N txgs will be available in \fB/proc/spl/kstat/zfs/<pool>/txgs\fR .sp -Default value: \fB100\fR. +Default value: \fB0\fR. .RE .sp @@ -1820,8 +1840,8 @@ Default value: \fB16\fR (effectively 65536). \fBzfs_vdev_cache_max\fR (int) .ad .RS 12n -Inflate reads small than this value to meet the \fBzfs_vdev_cache_bshift\fR -size. +Inflate reads smaller than this value to meet the \fBzfs_vdev_cache_bshift\fR +size (default 64k). .sp Default value: \fB16384\fR. .RE @@ -1928,7 +1948,8 @@ Default value: \fB32,768\fR. \fBzfs_vdev_scheduler\fR (charp) .ad .RS 12n -Set the Linux I/O scheduler on whole disk vdevs to this scheduler +Set the Linux I/O scheduler on whole disk vdevs to this scheduler. Valid options +are noop, cfq, bfq & deadline .sp Default value: \fBnoop\fR. .RE |