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add vfs_zfs.abd_chunk_size tunable

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It is reported that the default value of 4KB results in a substantial
memory use overhead (at least, on some configurations).  Using 1KB seems
to reduce the overhead significantly.

PR:		222377
Reported by:	Sean Chittenden <sean@chittenden.org>
MFC after:	1 week
This commit is contained in:
Andriy Gapon 2017-09-20 08:36:31 +00:00
parent 3d5487d981
commit aacd0b4bb2
1 changed files with 7 additions and 0 deletions
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7
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c
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@ -150,6 +150,13 @@ boolean_t zfs_abd_scatter_enabled = B_TRUE;
*/
size_t zfs_abd_chunk_size = 4096;
#if defined(__FreeBSD__) && defined(_KERNEL)
SYSCTL_DECL(_vfs_zfs);
SYSCTL_ULONG(_vfs_zfs, OID_AUTO, abd_chunk_size, CTLFLAG_RDTUN,
&zfs_abd_chunk_size, 0, "The size of the chunks ABD allocates");
#endif
#ifdef _KERNEL
extern vmem_t *zio_alloc_arena;
#endif