Date: Mon, 20 Dec 2004 21:51:07 -0500 From: Michael Meltzer <mjm@michaelmeltzer.com> To: current@freebsd.org Subject: twa driver, 3ware 9500s-4lp, speed issue Message-ID: <41C78F9B.4010804@michaelmeltzer.com>
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I have a 3ware 9500s-4lp controller with 4 10,000rpm raptors hooked up
to it. 0+1 configuration. AMD dual 64 bit processor.
This Hardware setup had Sese 9.1 running on it for a few days, One on
the issues I had was that the controller seemed "slow". After reading
3ware white paper for turning for 2.6, the issue seemed to be buffer
read ahead, i.e. blockdev -setra 16384 /dev/sda was needed for any type
of read speed. Some quick benchmark under Bonnie++ Sequential read
speeds from the mid 40's to 105meg/sec and had the write remained around
98 meg/sec.
Now the Problem. loaded 5.3 , cvsup'ed and built for freebsd 5.3 stable,
same hardware, the controller is feeling "slow" again. I tried to play
with the vfs prams (vfs.read_max after some googling around). I could
not find much information(other than the handbook) about the vfs prams
and was unable to increase the speed. Can Any one sheed some light,
subjections? insight, Gratefull for any help.
Her is a iozone report pretty close to the linux bonnie++(sorry the
bonnie failed) to give you all an idea whats up. exect same hardware.
only change was OS and filesystem. Thank You
MJM
iozone -s 20480m -r 60 -i 0 -i 1 -t 1
Iozone: Performance Test of File I/O
Version $Revision: 3.196 $
Compiled for 64 bit mode.
Build: freebsd
Contributors:William Norcott, Don Capps, Isom Crawford, Kirby
Collins
Al Slater, Scott Rhine, Mike Wisner, Ken Goss
Steve Landherr, Brad Smith, Mark Kelly, Dr. Alain CYR,
Randy Dunlap, Mark Montague, Dan Million,
Jean-Marc Zucconi, Jeff Blomberg.
Run began: Mon Dec 20 21:03:36 2004
File size set to 20971520 KB
Record Size 60 KB
Command line used: iozone -s 20480m -r 60 -i 0 -i 1 -t 1
Output is in Kbytes/sec
Time Resolution = 0.000001 seconds.
Processor cache size set to 1024 Kbytes.
Processor cache line size set to 32 bytes.
File stride size set to 17 * record size.
Throughput test with 1 process
Each process writes a 20971520 Kbyte file in 60 Kbyte records
Children see throughput for 1 initial writers = 78738.67 KB/sec
Parent sees throughput for 1 initial writers = 78716.55 KB/sec
Min throughput per process = 78738.67 KB/sec
Max throughput per process = 78738.67 KB/sec
Avg throughput per process = 78738.67 KB/sec
Min xfer = 20971500.00 KB
Children see throughput for 1 rewriters = 32126.46 KB/sec
Parent sees throughput for 1 rewriters = 32125.77 KB/sec
Min throughput per process = 32126.46 KB/sec
Max throughput per process = 32126.46 KB/sec
Avg throughput per process = 32126.46 KB/sec
Min xfer = 20971500.00 KB
Children see throughput for 1 readers = 58563.70 KB/sec
Parent sees throughput for 1 readers = 58557.14 KB/sec
Min throughput per process = 58563.70 KB/sec
Max throughput per process = 58563.70 KB/sec
Avg throughput per process = 58563.70 KB/sec
Min xfer = 20971500.00 KB
Children see throughput for 1 re-readers = 58583.77 KB/sec
Parent sees throughput for 1 re-readers = 58581.98 KB/sec
Min throughput per process = 58583.77 KB/sec
Max throughput per process = 58583.77 KB/sec
Avg throughput per process = 58583.77 KB/sec
Min xfer = 20971500.00 KB
iozone test complete.
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