mpt Serious performance issues

[Stephan <stephanwib%googlemail.com@localhost>]

Hi folks,

I already sent this to netbsd-users but didn´t get an answer. The
Netbsd mpt driver in release 5.0.2 and 5.1 does perform extremely slow
on LSI Logic 1030 RAID controllers. Some findings:

Write speed:

# dd if=/dev/zero of=myfile bs=4096 count=10000
10000+0 records in
10000+0 records out
40960000 bytes transferred in 12.762 secs (3209528 bytes/sec)

Read speed after reboot:

# dd if=myfile of=/dev/null
80000+0 records in
80000+0 records out
40960000 bytes transferred in 6.929 secs (5911386 bytes/sec)



# dmesg | egrep 'sd0|ses0|mpt'
mpt0 at pci2 dev 5 function 0: vendor 0x1000 product 0x0030
mpt0: interrupting at ioapic1 pin 1
scsibus0 at mpt0: 16 targets, 8 luns per target
sd0 at scsibus0 target 0 lun 0: <LSILOGIC, 1030          IM, 1000> disk
fixed
sd0: fabricating a geometry
sd0: 69400 MB, 69400 cyl, 64 head, 32 sec, 512 bytes/sect x 142131200
sectors
sd0: fabricating a geometry
sd0: sync (6.25ns offset 127), 16-bit (320.000MB/s) transfers, tagged
queueing
ses0 at scsibus0 target 8 lun 0: <SDR, GEM318, 0> processor fixed
ses0: SAF-TE Compliant Device
ses0: async, 8-bit transfers
boot device: sd0
root on sd0a dumps on sd0b
sd0(mpt0:0:0:0):  Check Condition on CDB: 0x1a 08 48 00 17 00
sd0(mpt0:0:0:0):  Check Condition on CDB: 0x1a 08 48 00 17 00
sd0(mpt0:0:0:0):  Check Condition on CDB: 0x1a 08 48 00 17 00


# pcictl pci2 list
002:05:0: Symbios Logic 53c1020/53c1030 (SCSI mass storage, revision 0xc1)

# dkctl sd0
strategy:
/dev/rsd0d: priocscan

cache:
/dev/rsd0d: read cache enabled
/dev/rsd0d: read cache enable is not changeable
/dev/rsd0d: write cache enable is not changeable
/dev/rsd0d: cache parameters are not savable

wedges:
/dev/rsd0d: no wedges configured



Obviously, there is no write cache. FreeBSDs mpt driver is performing
much faster (over 60MB/s). What could be wrong here?

Regards,

Stephan