diff options
| author | avg <avg@FreeBSD.org> | 2014-10-07 14:30:24 +0000 |
|---|---|---|
| committer | avg <avg@FreeBSD.org> | 2014-10-07 14:30:24 +0000 |
| commit | a402f22912f751877b91f20b328c3f8ffc169b1e (patch) | |
| tree | f34ac9bd5d13a0df4369131b3baa928f7b9c05af | |
| parent | 073bd9bd13425e6588e77bb94607bc4fea41ba02 (diff) | |
| download | FreeBSD-src-a402f22912f751877b91f20b328c3f8ffc169b1e.zip FreeBSD-src-a402f22912f751877b91f20b328c3f8ffc169b1e.tar.gz | |
reduce L2ARC_WRITE_SIZE on FreeBSD
FreeBSD has ARC_BUFC_NUMMETADATALISTS metadata lists and ARC_BUFC_NUMDATALISTS
data lists (currently both are 16) while illumos has just a single list
of each kind.
L2ARC_WRITE_SIZE determines the default value of l2arc_write_max which
defines limits on how much data is scanned and written to a cache device
during each run of the l2arc feed thread. The limits are applied on the
per buffer list basis.
Because FreeBSD has more lists we proportionally reduce the limits.
Reviewed by: Brendan Gregg (earlier version)
MFC after: 2 weeks
Sponsored by: HybridCluster
| -rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c index 1a1d4d8..fb7d1d8 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/arc.c @@ -711,7 +711,9 @@ uint64_t zfs_crc64_table[256]; * Level 2 ARC */ -#define L2ARC_WRITE_SIZE (8 * 1024 * 1024) /* initial write max */ +/* initial write max */ +#define L2ARC_WRITE_SIZE \ + (8 * 1024 * 1024 * 2 / (ARC_BUFC_NUMMETADATALISTS + ARC_BUFC_NUMDATALISTS)) #define L2ARC_HEADROOM 2 /* num of writes */ /* * If we discover during ARC scan any buffers to be compressed, we boost |
