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

In the last episode (Sep 29), Albert Chin said:
On Thu, Sep 28, 2006 at 05:15:05PM -0500, Albert Chin wrote:
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.

I reran some of the tests with the same 320-2 but on an Intel
SE7520BD2 with 32-bit and 64-bit (100Mhz) slots:
#1. RAID 1, two U320 drives, channel 1, 32-bit, 33Mhz slot
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 186 99 16707 5 16063 6 654 99 537320 93 4129 50
Latency 45215us 199ms 89764us 34740us 1215us 1808ms
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 7441 23 +++++ +++ +++++ +++ 5799 18 +++++ +++ +++++ +++
Latency 479ms 122us 2508us 606ms 13549us 101us

#2. RAID 1, two U320 drives, channel 1, 64-bit, 100Mhz slot
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 186 99 18006 6 15964 5 634 99 571275 99 4450 57
Latency 44992us 139ms 130ms 35143us 1238us 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 7581 24 +++++ +++ +++++ +++ 5750 18 +++++ +++ +++++ +++
Latency 511ms 255us 2615us 622ms 12691us 53us

Odd that I don't get x2 the performance when the bus bandwidth doubles
in speed.

Not really odd, since you're nowhere near even the 32-bit bus's max.
(32bit * 33Mhz) / 8 bits = 132 MB/sec, and in write-through mode you're
spending most of your time witing for the disks to sync. With a larger
filesize you might see a difference in the sequential input test;
judging by your insane sequential read and random seek values, your
300M test file looks like it's completely cached in RAM. A size 2x
your RAM capacity is recommended.

--
Dan Nelson
dnelson@xxxxxxxxxxxxxxx
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