On Sun, 30 Mar 1997, Curt Sampson wrote:

> On Sun, 30 Mar 1997, Soren S. Jorvang wrote:
> 
> > I usually change the default
> > 8K/1K to 32K/8K. Real life performance is vastly improved and the
> > difference in speed between reading the raw disk device and reading a large
> > test file is not noticeable, as opposed to the normal 1:3 ratio.
> 
> This strikes me as a bit odd; on my machines (486s, Pentiums,
> low-end Sparcs) with the standard 8K/1K block/fragment sizes, I
> normally get very similar speeds out of bonnie and iozone very
> close to what I get from dd if=/dev/rsdxx of=/dev/null.

Using what block size for dd? On the system I am writing this on,
the above 'dd' reads 0.6MB/sec from disk, while 'dd bs=64k' reads 7.1MB/sec
from the same disk.

I am running -current. Before the MAXPHYS changes, my results were
pretty much the same as yours.


-- 
Soren