svn commit: r307298 - stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs

[Alexander Motin]

Author: mav
Date: Fri Oct 14 07:45:10 2016
New Revision: 307298
URL: https://svnweb.freebsd.org/changeset/base/307298

Log:
MFC r305561: MFV r305560:
7278 tuning zfs_arc_max does not impact arc_c_min

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.k...@delphix.com>
Reviewed by: Paul Dagnelie <paul.d...@delphix.com>
Reviewed by: Prakash Surya <prakas...@delphix.com>
Reviewed by: Igor Kozhukhov <ikozh...@gmail.com>
Author: Matthew Ahrens <mah...@delphix.com>

openzfs/openzfs@608764beadaf4bb71c5d8fe1818e8392ac66a61b

Modified:
stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
Directory Properties:
stable/10/ (props changed)

Modified: stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c
==============================================================================
--- stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Fri Oct 14 07:44:24 2016 (r307297)
+++ stable/10/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c Fri Oct 14 07:45:10 2016 (r307298)
@@ -5998,8 +5998,10 @@ arc_init(void)
* Allow the tunables to override our calculations if they are
* reasonable.
*/
- if (zfs_arc_max > arc_abs_min && zfs_arc_max < kmem_size())
+ if (zfs_arc_max > arc_abs_min && zfs_arc_max < kmem_size()) {
arc_c_max = zfs_arc_max;
+ arc_c_min = MIN(arc_c_min, arc_c_max);
+ }
if (zfs_arc_min > arc_abs_min && zfs_arc_min <= arc_c_max)
arc_c_min = zfs_arc_min;
#endif
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