diff options
Diffstat (limited to 'man')
| -rw-r--r-- | man/man5/zfs-module-parameters.5 | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/man/man5/zfs-module-parameters.5 b/man/man5/zfs-module-parameters.5 index c2abd9d80..c209acbe1 100644 --- a/man/man5/zfs-module-parameters.5 +++ b/man/man5/zfs-module-parameters.5 @@ -864,6 +864,23 @@ Default value: \fB8192\fR. .sp .ne 2 .na +\fBzfs_arc_eviction_pct\fR (int) +.ad +.RS 12n +When \fBarc_is_overflowing()\fR, \fBarc_get_data_impl()\fR waits for this +percent of the requested amount of data to be evicted. For example, by +default for every 2KB that's evicted, 1KB of it may be "reused" by a new +allocation. Since this is above 100%, it ensures that progress is made +towards getting \fBarc_size\fR under \fBarc_c\fR. Since this is finite, it +ensures that allocations can still happen, even during the potentially long +time that \fBarc_size\fR is more than \fBarc_c\fR. +.sp +Default value: \fB200\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_arc_evict_batch_limit\fR (int) .ad .RS 12n @@ -1151,6 +1168,29 @@ Default value: \fB0\fR% (disabled). .sp .ne 2 .na +\fBzfs_arc_shrinker_limit\fR (int) +.ad +.RS 12n +This is a limit on how many pages the ARC shrinker makes available for +eviction in response to one page allocation attempt. Note that in +practice, the kernel's shrinker can ask us to evict up to about 4x this +for one allocation attempt. +.sp +The default limit of 10,000 (in practice, 160MB per allocation attempt with +4K pages) limits the amount of time spent attempting to reclaim ARC memory to +less than 100ms per allocation attempt, even with a small average compressed +block size of ~8KB. +.sp +The parameter can be set to 0 (zero) to disable the limit. +.sp +This parameter only applies on Linux. +.sp +Default value: \fB10,000\fR. +.RE + +.sp +.ne 2 +.na \fBzfs_arc_sys_free\fR (ulong) .ad .RS 12n |