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.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
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2020-12-20 02:59:44 +00:00
svn path=/vendor-sys/illumos/dist/; revision=305560
@ -5618,8 +5618,10 @@ arc_init(void)
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* Allow the tunables to override our calculations if they are
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* reasonable (ie. over 64MB)
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*/
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if (zfs_arc_max > 64 << 20 && zfs_arc_max < allmem)
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if (zfs_arc_max > 64 << 20 && zfs_arc_max < allmem) {
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arc_c_max = zfs_arc_max;
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arc_c_min = MIN(arc_c_min, arc_c_max);
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}
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if (zfs_arc_min > 64 << 20 && zfs_arc_min <= arc_c_max)
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arc_c_min = zfs_arc_min;
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