On Tue, Jul 03, 2007 at 10:20:18PM +1000, Jonathan Gray wrote: > On Tue, Jul 03, 2007 at 01:49:09PM +0200, Martin Toft wrote: > > 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 off "alarm > > bells" -- 8.5-8.7 MB/s vs. 45-46 MB/s. > > Well at least use dd in both cases and use the same kinds of buffered > or unbuffered devices/files. > > I imagine the results will be diferrent if you dd from a file to > /dev/null for example.
You're absolutely right. On OpenBSD, dd'ing a file actually gives an OK result: $ dd if=KNOPPIX_V5.0.1CD-2006-09-25-DA.iso of=/dev/null 1433280+0 records in 1433280+0 records out 733839360 bytes transferred in 22.626 secs (32432248 bytes/sec) 30.93 MB/s that is. As I can't figure out how to mount my OpenBSD partitions on KNOPPIX, I can't do the same test in that environment. Thanks for pointing out that the previous comparison was unfair. It seems that I can't really be disappointed with my OpenBSD disk I/O now, only the system's number crunching abilities. I would like to remind you, that I could squeeze a lot more CPU power out of the laptop with OpenBSD -current about a month ago, so in some way, I suspect that some crucial code has been changed in the meantime. Martin
