retaking this thread, I got the same issue, very poor disk performance comparing openbsd 4.1 with linux 2.6.22
# time dd if=input_file of=file_out bs=1024 count=1024000 input_file is 1GB On OpenBSD box it takes 4min, transfering about 3,3MB/s On linux 2.6.22 it takes 1min, transfering about 17MB/s The difference is very very big.. 2007/7/3, Martin Toft <[EMAIL PROTECTED]>: > > 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
