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Limit zfs_dirty_data_max_max to 4G 

Reinstate default 4G zfs_dirty_data_max_max limit.

Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov>
Reviewed-by: Chunwei Chen <david.chen@osnexus.com>
Reviewed-by: George Melikov <mail@gmelikov.ru>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #6072
Closes #6081
This commit is contained in:
Brian Behlendorf 2017-05-01 13:01:39 -07:00 committed by Tony Hutter
parent 1e5f75ecbe
commit a83a4f9d10
1 changed files with 4 additions and 3 deletions
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7
module/zfs/arc.c
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@ -5475,11 +5475,12 @@ arc_init(void)
* If it has been set by a module parameter, take that.
* Otherwise, use a percentage of physical memory defined by
* zfs_dirty_data_max_percent (default 10%) with a cap at
* zfs_dirty_data_max_max (default 25% of physical memory).
* zfs_dirty_data_max_max (default 4G or 25% of physical memory).
*/
if (zfs_dirty_data_max_max == 0)
zfs_dirty_data_max_max = (uint64_t)physmem * PAGESIZE *
zfs_dirty_data_max_max_percent / 100;
zfs_dirty_data_max_max = MIN(4ULL * 1024 * 1024 * 1024,
(uint64_t)physmem * PAGESIZE *
zfs_dirty_data_max_max_percent / 100);
if (zfs_dirty_data_max == 0) {
zfs_dirty_data_max = (uint64_t)physmem * PAGESIZE *