Subject: Re: ATAPI CD performance (update)
To: Daniel Carosone <email@example.com>
From: None <Federico_Lupi@www.datasys.it>
Date: 10/14/1999 11:17:58
Daniel Carosone writes:
> Federico_Lupi@www.datasys.it writes:
> > ASUS 40x (cd0) HP 24x (cd1)
>> NetBSD 1.4.1 360 K/s 860 K/s
> Wow. Same hardware config as before, on a kernel built yesterday:
> 282066944 bytes transferred in 79 secs (3570467 bytes/sec)
> So, someting got fixed in the past couple of weeks!
Are you using 'cd..' or 'rcd..' for your tests?
I made some more tests with NetBSD 1.4.1
dd if=/dev/cd0d of=/dev/null bs=32k ==> 360 K/s
dd if=/dev/rcd0d of=/dev/null bs=32k ==> 4000 K/s
dd if=/dev/cd1d of=/dev/null bs=32k ==> 860 K/s
dd if=/dev/rcd1d of=/dev/null bs=32k ==> 2600 K/s
I wonder why rcd0d is an order of magnitude faster than cd0d.
Also I don't understand why cd0d is slower than cd1d (should be
the opposite) and rc0d is faster than rc1d.