Trouble with LSI Logic / Symbios Logic 53c1030 on Linux 2.6.20.4

[Halim Issa <yallaone@gmail.com>]

Hello List,

Running vanilla kernel 2.6.20.4 (unmodified from kernel.org) on an IBM x335 
Server with LSI Logic 53c1030 and two SCSI disks in RAID-1, we have some 
serious performance issues that we suspect are present due to driver 
problems.

The performance is as follows:

[189] root@spirou:/tmp#dd if=/dev/sda7 of=/dev/null bs=64k count=100
100+0 records in
100+0 records out
6553600 bytes (6.6 MB) copied, 1.50139 s, 4.4 MB/s
[190] root@spirou:/tmp#dd if=/dev/sda7 of=/dev/null bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (66 MB) copied, 18.0209 s, 3.6 MB/s
[191] root@spirou:/tmp#dd if=/dev/sda7 of=/dev/null bs=64k count=10000
10000+0 records in
10000+0 records out
655360000 bytes (655 MB) copied, 179.74 s, 3.6 MB/s

I've also tried copying between real files (ie non-/dev-files)

[496] root@spirou:/root#dd if=testfile.out of=test.yalla bs=64k count=1000
1000+0 records in
1000+0 records out
65536000 bytes (66 MB) copied, 12.5143 s, 5.2 MB/s

Needless to say, getting between three and five meg throughput on such a
system clearly means something is wrong, and the most likely culprit is the 
operator (myself), but so far I have found no indications anywhere on how to 
proceed, and hence this email..

The card according to lspci -v :

01:01.0 SCSI storage controller: LSI Logic / Symbios Logic 53c1030 PCI-X
Fusion-
MPT Dual Ultra320 SCSI (rev 07)
    Subsystem: IBM Unknown device 026d
    Flags: bus master, 66MHz, medium devsel, latency 72, IRQ 16
    I/O ports at 2300 [size=256]
    Memory at fbff0000 (64-bit, non-prefetchable) [size=64K]
    Memory at fbfe0000 (64-bit, non-prefetchable) [size=64K]
    [virtual] Expansion ROM at 88100000 [disabled] [size=1M]
    Capabilities: [50] Power Management version 2
    Capabilities: [58] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0
Enable-
    Capabilities: [68] PCI-X non-bridge device

The kernel config is at : http://pastebin.ca/411667
the dmesg output is at : http://pastebin.ca/411670

Is this a common problem on these controllers?
Perhaps needless to say, I'm rather new to this and am trying to gain 
experience in this field as quickly as possible. Any hints to bugfixes, 
patches or configuration hints would be most greatly appreciated!

Thanks in advance for any insight - it will be warmly appreciated!

 -h
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