On Thu, Oct 21, 2004 at 09:35:12AM +0200, fandino wrote: > Mike Tancsa wrote: > >Its strange that you do not see any difference in speed when reading > >from the device directly vs a file ? I see quite a difference in my > >setup on a RELENG_5 box and not so much a difference on a RELENG_4 box. > >Perhaps as someone suggested, the GEOM layer ? > > > >e.g. create a file with junk larger than your RAM. (the machine below > >has 256M) > > -- same mobo and same disks -- > > OpenBSD 3.5: > > dd if=/mnt/aa of=/dev/null bs=1024k count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes transferred in 18.743 secs (57287584 bytes/sec) > > > FreeBSD 5.3rc1: > > # dd if=/mnt/aa of=/dev/null bs=1024k count=1024 > 1024+0 records in > 1024+0 records out > 1073741824 bytes transferred in 42.215597 secs (25434719 bytes/sec) BTW, others have asked that you not use dd as your "benchmark", because it's not benchmarking anything relevant for real-world use of the disk. Kris
This archive was generated by hypermail 2.4.0 : Wed May 19 2021 - 11:38:18 UTC