FreeBSD r256956: Improve ZFS N-way mirror read performance by using l…

…oad and locality information.

The existing algorithm selects a preferred leaf vdev based on offset of the zio
request modulo the number of members in the mirror. It assumes the devices are
of equal performance and that spreading the requests randomly over both drives
will be sufficient to saturate them. In practice this results in the leaf vdevs
being under utilized.

The new algorithm takes into the following additional factors:
* Load of the vdevs (number outstanding I/O requests)
* The locality of last queued I/O vs the new I/O request.

Within the locality calculation additional knowledge about the underlying vdev
is considered such as; is the device backing the vdev a rotating media device.

This results in performance increases across the board as well as significant
increases for predominantly streaming loads and for configurations which don't
have evenly performing devices.

The following are results from a setup with 3 Way Mirror with 2 x HD's and
1 x SSD from a basic test running multiple parrallel dd's.

With pre-fetch disabled (vfs.zfs.prefetch_disable=1):

== Stripe Balanced (default) ==
Read 15360MB using bs: 1048576, readers: 3, took 161 seconds @ 95 MB/s
== Load Balanced (zfslinux) ==
Read 15360MB using bs: 1048576, readers: 3, took 297 seconds @ 51 MB/s
== Load Balanced (locality freebsd) ==
Read 15360MB using bs: 1048576, readers: 3, took 54 seconds @ 284 MB/s

With pre-fetch enabled (vfs.zfs.prefetch_disable=0):

== Stripe Balanced (default) ==
Read 15360MB using bs: 1048576, readers: 3, took 91 seconds @ 168 MB/s
== Load Balanced (zfslinux) ==
Read 15360MB using bs: 1048576, readers: 3, took 108 seconds @ 142 MB/s
== Load Balanced (locality freebsd) ==
Read 15360MB using bs: 1048576, readers: 3, took 48 seconds @ 320 MB/s

In addition to the performance changes the code was also restructured, with
the help of Justin Gibbs, to provide a more logical flow which also ensures
vdevs loads are only calculated from the set of valid candidates.

The following additional sysctls where added to allow the administrator
to tune the behaviour of the load algorithm:
* vfs.zfs.vdev.mirror.rotating_inc
* vfs.zfs.vdev.mirror.rotating_seek_inc
* vfs.zfs.vdev.mirror.rotating_seek_offset
* vfs.zfs.vdev.mirror.non_rotating_inc
* vfs.zfs.vdev.mirror.non_rotating_seek_inc

These changes where based on work started by the zfsonlinux developers:
openzfs#1487

Reviewed by:	gibbs, mav, will
MFC after:	2 weeks
Sponsored by:	Multiplay

Porting notes:

- The tunables were adjusted to have ZoL-style names.

- The code was modified to use ZoL's vd_nonrot.

- Fixes were done to make cstyle.pl happy

- Merge conflicts were handled manually

- freebsd/freebsd-src@e186f56 by my
  collegue Andriy Gapon has been included. It applied perfectly, but
  added a cstyle regression.

- This replaces 556011d entirely.

- vdev_mirror_shift from OpenSolaris was missing from our code, so it
  has been added.

- A typo "IO'a" has been corrected to say "IO's"

Ported-by: Richard Yao <ryao@gentoo.org>

include/sys/vdev.h

@@ -119,6 +119,10 @@ extern void vdev_queue_fini(vdev_t *vd);
 extern zio_t *vdev_queue_io(zio_t *zio);
 extern void vdev_queue_io_done(zio_t *zio);
 
+extern int vdev_queue_length(vdev_t *vd);
+extern uint64_t vdev_queue_lastoffset(vdev_t *vd);
+extern void vdev_queue_register_lastoffset(vdev_t *vd, zio_t *zio);
+
 extern void vdev_config_dirty(vdev_t *vd);
 extern void vdev_config_clean(vdev_t *vd);
 extern int vdev_config_sync(vdev_t **svd, int svdcount, uint64_t txg);

include/sys/vdev_impl.h

@@ -120,6 +120,7 @@ struct vdev_queue {
 	hrtime_t	vq_io_delta_ts;
 	zio_t		vq_io_search; /* used as local for stack reduction */
 	kmutex_t	vq_lock;
+	uint64_t	vq_lastoffset;
 };
 
 /*