Poor / buggy performance with the mpt driver in 8.1 AMD64?

[Mattias Lindgren]

I have 8 Seagate SATA disks connected to an intel branded LSI 3081E
SAS controller (Intel SASUC8I).  I have 4 of the 1.5T disks and I have
4 2T disks (both are the LP 5900RPM variety) in a pair of raidz1s in a
ZFS pool.  Doing simple dd writes and reads I get about 80MByte write
and 150MByte read which seems very very slow to me.  I'm also getting
errors from mpt on boot:

#dmesg |grep mpt

mpt0: <LSILogic SAS/SATA Adapter> port 0xc800-0xc8ff mem
0xfe9fc000-0xfe9fffff,0xfe9e0000-0xfe9effff irq 16 at device 0.0 on
pci1
mpt0: [ITHREAD]
mpt0: MPI Version=1.5.19.0
mpt0: Capabilities: ( RAID-0 RAID-1E RAID-1 )
mpt0: 0 Active Volumes (2 Max)
mpt0: 0 Hidden Drive Members (14 Max)
da0 at mpt0 bus 0 scbus0 target 0 lun 0
da1 at mpt0 bus 0 scbus0 target 1 lun 0
da2 at mpt0 bus 0 scbus0 target 2 lun 0
da3 at mpt0 bus 0 scbus0 target 3 lun 0
da4 at mpt0 bus 0 scbus0 target 4 lun 0
da5 at mpt0 bus 0 scbus0 target 5 lun 0
da6 at mpt0 bus 0 scbus0 target 6 lun 0
da7 at mpt0 bus 0 scbus0 target 7 lun 0
mpt0: request 0xffffff80003aedc0:8885 timed out for ccb
0xffffff00020a7800 (req->ccb 0xffffff00020a7800)
mpt0: attempting to abort req 0xffffff80003aedc0:8885 function 0
mpt0: mpt_wait_req(1) timed out
mpt0: mpt_recover_commands: abort timed-out. Resetting controller
mpt0: mpt_cam_event: 0x0
mpt0: mpt_cam_event: 0x0
mpt0: completing timedout/aborted req 0xffffff80003aedc0:8885
mpt0: mpt_cam_event: 0x16
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x16
mpt0: request 0xffffff80003b6110:9108 timed out for ccb
0xffffff00085fc800 (req->ccb 0xffffff00085fc800)
mpt0: attempting to abort req 0xffffff80003b6110:9108 function 0
mpt0: mpt_wait_req(1) timed out
mpt0: mpt_recover_commands: abort timed-out. Resetting controller
mpt0: mpt_cam_event: 0x0
mpt0: completing timedout/aborted req 0xffffff80003b6110:9108
mpt0: mpt_cam_event: 0x16
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x16
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x16
mpt0: request 0xffffff80003ac8a0:9287 timed out for ccb
0xffffff000857d000 (req->ccb 0xffffff000857d000)
mpt0: attempting to abort req 0xffffff80003ac8a0:9287 function 0
mpt0: mpt_wait_req(1) timed out
mpt0: mpt_recover_commands: abort timed-out. Resetting controller
mpt0: mpt_cam_event: 0x0
mpt0: completing timedout/aborted req 0xffffff80003ac8a0:9287
mpt0: mpt_cam_event: 0x16
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x16
mpt0: mpt_cam_event: 0x16
mpt0: mpt_cam_event: 0x12
mpt0: mpt_cam_event: 0x12

etc

I'm running a vanilla version of FreeBSD with no special kernel patches.

FreeBSD beastie 8.1-RELEASE FreeBSD 8.1-RELEASE #0: Mon Jul 19
02:36:49 UTC 2010
root at mason.cse.buffalo.edu:/usr/obj/usr/src/sys/GENERIC  amd64

I have the following in /boot/loader.conf per the FreeBSD ZFS tuning
guide pertaining to NFS shares:

vfs.zfs.zil_disable="1"

Does anyone have any thoughts on getting rid of the cam event error as
well as my performance numbers?  Other people with comparable systems
are reporting dd numbers that are twice what I'm seeing.