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author | avg <avg@FreeBSD.org> | 2017-10-01 14:58:43 +0000 |
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committer | avg <avg@FreeBSD.org> | 2017-10-01 14:58:43 +0000 |
commit | dcfc2bd7cd1285924c2dcad43a959a082ffb2903 (patch) | |
tree | b5f180a0ab710b518885df3ec94514dcff98af21 | |
parent | f3ddf0f93c89dc9578ebf10214ced1ec97266d0a (diff) | |
download | FreeBSD-src-dcfc2bd7cd1285924c2dcad43a959a082ffb2903.zip FreeBSD-src-dcfc2bd7cd1285924c2dcad43a959a082ffb2903.tar.gz |
MFC r323797: add vfs_zfs.abd_chunk_size tunable
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
-rw-r--r-- | sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c index 94e5a22..2cd87c2 100644 --- a/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c +++ b/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/abd.c @@ -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 |