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7278 tuning zfs_arc_max does not impact arc_c_min

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When changing zfs_arc_max (e.g. as zdb does), it may be set to less
than the default arc_c_min. arc_c_min should decrease to not be more than
arc_c_max, but it doesn't; therefore tuning of arc_c_max is ineffective.

Reviewed by: Dan Kimmel <dan.kimmel@delphix.com>
Reviewed by: Paul Dagnelie <paul.dagnelie@delphix.com>
Reviewed by: Prakash Surya <prakash.surya@delphix.com>
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Author: Matthew Ahrens <mahrens@delphix.com>

openzfs/openzfs@608764bead
This commit is contained in:
Alexander Motin 2016-09-07 20:00:22 +00:00
parent 72a9a6ded9
commit 03d951aef3
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor-sys/illumos/dist/; revision=305560
1 changed files with 3 additions and 1 deletions
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4
uts/common/fs/zfs/arc.c
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@ -5618,8 +5618,10 @@ arc_init(void)
* Allow the tunables to override our calculations if they are
* reasonable (ie. over 64MB)
*/
if (zfs_arc_max > 64 << 20 && zfs_arc_max < allmem)
if (zfs_arc_max > 64 << 20 && zfs_arc_max < allmem) {
arc_c_max = zfs_arc_max;
arc_c_min = MIN(arc_c_min, arc_c_max);
}
if (zfs_arc_min > 64 << 20 && zfs_arc_min <= arc_c_max)
arc_c_min = zfs_arc_min;