Kent Polk wrote:

> On 19 Jul 2001 18:35:05 -0500, Rick Kelly wrote:
> > 
> > speedy# /usr/bin/time dd if=/dev/zero of=/dev/null bs=64k count=16384
> > 16384+0 records in
> > 16384+0 records out
> > 1073741824 bytes transferred in 1 secs (1073741824 bytes/sec)
> >         0.53 real         0.00 user         0.52 sys
> 
> and I get:
> 
> $ /usr/bin/time dd if=/dev/zero of=/dev/null bs=64k
> count=16384
> 16384+0 records in
> 16384+0 records out
> 1073741824 bytes transferred in 1 secs (1073741824 bytes/sec)
>         0.39 real         0.01 user         0.37 sys
> 
> Why would it get exactly the same transfer rate? Appears something
> on the mb maxed out unrelated to cpu speed.

Note that 64k*16384 = 1073741824.  Also, your real time is 0.39 seconds
and Rick's is 0.53 seconds.  It appears that dd(1) only divides by the
number of (partial?) seconds.  Maybe count=1638400 (100 times longer)
would provide a more usable benchmark..

Simon.
--
Simon Burge                            <simonb@wasabisystems.com>
NetBSD CDs, Support and Service:    http://www.wasabisystems.com/