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Dbuf hash table should be sized as is the arc hash table

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Commit 49ddb31506 added the
zfs_arc_average_blocksize parameter to allow control over the size of
the arc hash table.  The dbuf hash table's size should be determined
similarly.

Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3721
This commit is contained in:
Tim Chase 2015-08-30 20:59:23 -05:00 committed by Brian Behlendorf
parent 6cde64351e
commit 69de34219a
2 changed files with 7 additions and 3 deletions
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3
include/sys/arc.h
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@ -51,6 +51,9 @@ typedef void arc_done_func_t(zio_t *zio, arc_buf_t *buf, void *private);
typedef void arc_prune_func_t(int64_t bytes, void *private);
typedef int arc_evict_func_t(void *private);
/* Shared module parameters */
extern int zfs_arc_average_blocksize;
/* generic arc_done_func_t's which you can use */
arc_done_func_t arc_bcopy_func;
arc_done_func_t arc_getbuf_func;

7
module/zfs/dbuf.c
View File

@ -376,10 +376,11 @@ dbuf_init(void)
/*
* The hash table is big enough to fill all of physical memory
* with an average 4K block size. The table will take up
* totalmem*sizeof(void*)/4K (i.e. 2MB/GB with 8-byte pointers).
* with an average block size of zfs_arc_average_blocksize (default 8K).
* By default, the table will take up
* totalmem * sizeof(void*) / 8K (1MB per GB with 8-byte pointers).
*/
while (hsize * 4096 < physmem * PAGESIZE)
while (hsize * zfs_arc_average_blocksize < physmem * PAGESIZE)
hsize <<= 1;
retry: