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vdev_disk: add module parameter to select BIO submission method

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This makes the submission method selectable at module load time via the
`zfs_vdev_disk_classic` parameter, allowing this change to be backported
to 2.2 safely, and disabled in favour of the "classic" submission method
if new problems come up.

Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Rob Norris <rob.norris@klarasystems.com>
Sponsored-by: Klara, Inc.
Sponsored-by: Wasabi Technology, Inc.
Closes #15533
Closes #15588
(cherry picked from commit df2169d141)
This commit is contained in:
Rob Norris
2024-01-09 13:28:57 +11:00
committed by Brian Behlendorf
parent 51c2bd0def
commit af3a5bb40d
2 changed files with 45 additions and 2 deletions
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man/man4/zfs.4
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@@ -1352,6 +1352,22 @@ If this is higher than the maximum allowed by the device queue or the kernel
itself, it will be clamped.
Setting it to zero will cause the kernel's ideal size to be used.
This parameter only applies on Linux.
This parameter is ignored if
.Sy zfs_vdev_disk_classic Ns = Ns Sy 1 .
.
.It Sy zfs_vdev_disk_classic Ns = Ns Sy 0 Ns | Ns 1 Pq uint
If set to 1, OpenZFS will submit IO to Linux using the method it used in 2.2
and earlier.
This "classic" method has known issues with highly fragmented IO requests and
is slower on many workloads, but it has been in use for many years and is known
to be very stable.
If you set this parameter, please also open a bug report why you did so,
including the workload involved and any error messages.
.Pp
This parameter and the classic submission method will be removed once we have
total confidence in the new method.
.Pp
This parameter only applies on Linux, and can only be set at module load time.
.
.It Sy zfs_expire_snapshot Ns = Ns Sy 300 Ns s Pq int
Time before expiring