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Reenable vfs.zfs.zio.use_uma for amd64, disabled at r209261.

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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.
This commit is contained in:
Alexander Motin 2013-11-19 11:19:07 +00:00
parent a2de44abf5
commit c5068af559
1 changed files with 4 additions and 0 deletions
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4
sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zio.c
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@ -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");