Author: mav
Date: Tue Nov 19 11:19:07 2013
New Revision: 258342
URL: http://svnweb.freebsd.org/changeset/base/258342
Log:
Reenable vfs.zfs.zio.use_uma for amd64, disabled at r209261.
On machines with seveal CPUs and enough RAM this can easily twice improve
ZFS performance or twice reduce CPU usage. It was disabled three years
ago due to memory and KVA exhaustion reports, but our VM subsystem got
improved a lot since that time, hopefully enough to make another try.
Modified:
head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c
Modified: head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c
==============================================================================
--- head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c Tue Nov 19
11:11:51 2013 (r258341)
+++ head/sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c Tue Nov 19
11:19:07 2013 (r258342)
@@ -39,7 +39,11 @@
SYSCTL_DECL(_vfs_zfs);
SYSCTL_NODE(_vfs_zfs, OID_AUTO, zio, CTLFLAG_RW, 0, "ZFS ZIO");
+#if defined(__amd64__)
+static int zio_use_uma = 1;
+#else
static int zio_use_uma = 0;
+#endif
TUNABLE_INT("vfs.zfs.zio.use_uma", &zio_use_uma);
SYSCTL_INT(_vfs_zfs_zio, OID_AUTO, use_uma, CTLFLAG_RDTUN, &zio_use_uma, 0,
"Use uma(9) for ZIO allocations");
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