I just finished up some benchmarks on a RAID1 system here at work. The
machine is an HP E30, Pentium 166, 128MB of ram, HP PCI Adaptec SCSI card (I
think it's a 2920 with a boot rom of some sort). 2x2.1GB HP drives, running
mirrored across the board, except for swap. Right now, the machine isn't do
anything, but that gives me plenty of time to do re-compiles, which aren't
very fast. All tests have been done with tiotest-0.24, and with settings
--numruns 6 and --size 384.
This first test is 2.2.12 from a stock RH6.1 install.
Size is MB, BlkSz is Bytes, Read and Write are MB/sec, Seeks are Seeks/sec
Dir Size BlkSz Thr# Read (CPU%) Write (CPU%) Seeks (CPU%)
----- ------ ------- ---- ------------- -------------- --------------
. 384 4096 1 3.32616 15.8% 1.99082 9.02% 78.1085 2.58%
. 384 4096 2 3.17759 15.2% 1.95808 9.06% 78.0405 2.43%
. 384 4096 4 3.17624 15.5% 1.97681 9.45% 78.9123 2.51%
. 384 4096 8 3.25837 16.3% 1.99858 9.77% 80.1691 2.53%
Not very impressive...
Second test, stock 2.2.14.
Size is MB, BlkSz is Bytes, Read and Write are MB/sec, Seeks are Seeks/sec
Dir Size BlkSz Thr# Read (CPU%) Write (CPU%) Seeks (CPU%)
----- ------ ------- ---- ------------- -------------- --------------
. 384 4096 1 2.86103 14.4% 2.11047 9.43% 79.8300 2.52%
. 384 4096 2 2.89427 14.2% 2.07059 9.59% 80.5877 2.55%
. 384 4096 4 2.97460 14.6% 2.05492 10.3% 82.0260 2.54%
. 384 4096 8 3.12418 15.8% 2.03119 10.9% 83.2683 2.59%
Well, shoot, those writes are a little better, but the reads are sucking...
At least it doesn't use much CPU.
This last test is with 2.2.14 and Miko's RAID1 read balancing test.
Size is MB, BlkSz is Bytes, Read and Write are MB/sec, Seeks are Seeks/sec
Dir Size BlkSz Thr# Read (CPU%) Write (CPU%) Seeks (CPU%)
----- ------ ------- ---- ------------- -------------- --------------
. 384 4096 1 3.86832 18.2% 2.05358 9.99% 88.9377 2.69%
. 384 4096 2 4.68355 23.0% 2.03622 9.78% 106.298 3.18%
. 384 4096 4 5.04067 25.2% 2.02812 10.3% 118.177 3.56%
. 384 4096 8 5.26915 26.8% 2.00952 10.9% 128.202 3.85%
Wow, nice stuff of those reads look purty nice, reads are OK. The whole
machine seems to have pretty slow disk performance in general, perhaps
they're just slow disks. Cool stuff, thanks everybody!
Greg
