Poor write performance with LSI 320-2 on 6.1-STABLE

I have an Intel S875PWP1 motherboard with a Pentium4 CPU@xxxxxxxx PCI
bus is 33Mhz, 32-bit. I recently purchased an LSI 320-2/128MB on eBay
(though the card really looks like a PERC4/DS) and just ran some
bonnie++ tests on a RAID 1 array between two U320 drives for the first
channel and on a RAID 0 array between one U320 drive for the second
channel. The 320-2 has the latest LSI firmware, 1L47.

#1. (RAID 1, two U320 drives, channel 1)
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
maetel.il.thew 300M 270 99 16917 5 15734 5 514 99 +++++ +++ 4237 48
Latency 33357us 130ms 86843us 33195us 1063us 120ms
Version 1.93c ------Sequential Create------ --------Random Create--------
maetel.il.thewritte -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 9214 26 +++++ +++ +++++ +++ 6687 19 +++++ +++ +++++ +++
Latency 424ms 129us 2629us 475ms 115us 82us

#2. (RAID 1, two U320 drives, one on channel 1, one on channel 2)
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
maetel.il.thew 300M 272 99 16787 4 15949 5 515 99 +++++ +++ 4575 50
Latency 31339us 139ms 1925ms 29314us 848us 1623ms
Version 1.93c ------Sequential Create------ --------Random Create--------
maetel.il.thewritte -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 7497 22 +++++ +++ +++++ +++ 5850 17 +++++ +++ +++++ +++
Latency 516ms 123us 3381us 577ms 14425us 50us

#3. (RAID 0, one U320 drive, channel 2)
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
maetel.il.thew 300M 270 99 17347 5 16347 5 530 99 +++++ +++ 4510 46
Latency 34033us 131ms 100ms 34354us 1061us 1575ms
Version 1.93c ------Sequential Create------ --------Random Create--------
maetel.il.thewritte -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 8401 24 +++++ +++ +++++ +++ 6489 19 +++++ +++ +++++ +++
Latency 574ms 127us 7480us 640ms 16607us 46us

#4. I also testing an Adaptec 39160 card with one U320 drive:
Version 1.93c ------Sequential Output------ --Sequential Input- --Random-
Concurrency 1 -Per Chr- --Block-- -Rewrite- -Per Chr- --Block-- --Seeks--
Machine Size K/sec %CP K/sec %CP K/sec %CP K/sec %CP K/sec %CP /sec %CP
maetel.il.thew 300M 259 99 62293 18 36054 12 522 99 +++++ +++ 5747 58
Latency 33370us 26379us 43979us 34708us 1064us 1264ms
Version 1.93c ------Sequential Create------ --------Random Create--------
maetel.il.thewritte -Create-- --Read--- -Delete-- -Create-- --Read--- -Delete--
files /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP /sec %CP
16 16761 49 +++++ +++ +++++ +++ 13569 40 +++++ +++ +++++ +++
Latency 142ms 141us 49us 203ms 123us 43us


I don't understand how #1 gives 16MB/s (RAID 1) while #3 gives only
17MB/s. I'd expect #3 to be about x2 the performance of #1.

The arrays are configured with "write-thru" write policy, "adaptive"
read policy, and "cachedio" cache policy.

Anything I can do to improve the speed. Even though the bus is 33Mhz,
I should definitely be doing better than 16MB/s.

I'm running bonnie++ as:
$ cd [some tmp dir on UFS2 file system]
$ bonnie++

The system runs FreeBSD 6.1-STABLE:
$ uname -a
FreeBSD maetel.il.thewrittenword.com 6.1-STABLE FreeBSD 6.1-STABLE #0: Mon May 8 22:25:41 CDT 2006
$ dmesg | grep amr0
amr0: <LSILogic MegaRAID 1.53> mem 0xf47f0000-0xf47fffff irq 21 at device 0.0 on pci3
amr0: delete logical drives supported by controller
amr0: <LSILogic MegaRAID SCSI 320-2> Firmware 1L47, BIOS G121, 128MB RAM
amr0: delete logical drives supported by controller


--
albert chin (china@xxxxxxxxxxxxxxxxxx)
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