My disk I/O testing methods for FreeBSD 5.3 ...

[Mike Jakubik]

Nick Pavlica said:
> Jeff,
>   One of the tests where I saw a large difference was in DD.  I did a
> quick test on a server that was brought up to RELENG_5 via cvsup on
> 2/2/05.
>
> The Test:
> -bash-2.05b$ time dd bs=1024 if=/dev/zero of=tstfile count=1M
> 1048576+0 records in
> 1048576+0 records out
> 1073741824 bytes transferred in 74.402757 secs (14431479 bytes/sec)
>
> real    1m14.498s
> user    0m0.550s
> sys     0m8.838s

FYI.

# time dd bs=1024 if=/dev/zero of=tstfile count=1M
1048576+0 records in
1048576+0 records out
1073741824 bytes transferred in 22.150709 secs (48474377 bytes/sec)

real    0m22.173s
user    0m0.501s
sys     0m13.832s

This is on an old ATA disk.

FreeBSD 6.0-CURRENT #0: Wed Jan 19 21:11:16 EST 2005.

CPU: AMD Athlon(tm) Processor (1410.21-MHz 686-class CPU)
real memory  = 536788992 (511 MB)
acpi0: <ASUS A7V-133> on motherboard

ad0: 78167MB <Maxtor 6Y080P0/YAR41BW0> [158816/16/63] at ata0-master UDMA100