On Tue, Jul 03, 2007 at 04:32:13PM +1000, Jonathan Gray wrote: > Include the output of 'atactl wd0' perhaps you have something like > caching turned off. Also you can't hope for similiar results if you > use different programs on both systems.
Disk I/O is the only test where I use different programs (hdparm and dd), as I couldn't find a port/package of hdparm for OpenBSD. Still, I think the results are so different that they set of "alarm bells" -- 8.5-8.7 MB/s vs. 45-46 MB/s. Thanks for your interest my case. Here is the output from "atactl wd0". It looks like I have caching turned on (read look-ahead and write cache): Model: WDC WD1200BEVE-11UYT0, Rev: 01.04A01, Serial #: WD-WXE407324062 Device type: ATA, fixed Cylinders: 16383, heads: 16, sec/track: 63, total sectors: 234441648 Device capabilities: ATA standby timer values IORDY operation IORDY disabling Device supports the following standards: ATA-1 ATA-2 ATA-3 ATA-4 ATA-5 ATA-6 ATA-7 Master password revision code 0xfffe Device supports the following command sets: NOP command READ BUFFER command WRITE BUFFER command Host Protected Area feature set Read look-ahead Write cache Power Management feature set Security Mode feature set SMART feature set Flush Cache Ext command Flush Cache command Device Configuration Overlay feature set 48bit address feature set Automatic Acoustic Management feature set Set Max security extension commands Advanced Power Management feature set DOWNLOAD MICROCODE command IDLE IMMEDIATE with UNLOAD FEATURE SMART self-test SMART error logging Device has enabled the following command sets/features: NOP command READ BUFFER command WRITE BUFFER command Host Protected Area feature set Read look-ahead Write cache Power Management feature set SMART feature set Flush Cache Ext command Flush Cache command Device Configuration Overlay feature set 48bit address feature set Advanced Power Management feature set DOWNLOAD MICROCODE command Martin