ATA66 on a Via Chipset

[Alexander Valys]

Recently, I decided to try out Debian 2.2.  I downloaded the iso, installed 
it, and went to compile kernel 2.4.3.  I used the same .config file I've used 
before, containing all the appropriate support (ATA66, notably) for my Via 
Apollo Pro133A-based motherboard, installed it, and rebooted.  To make sure 
everything worked correctly, I ran hdparm -t /dev/hda, and was amazed to see 
transfer rates of 22 megs/second.  In redhat, the most I can get is 15.  So, 
I immediately reinstalled redhat, and (using the same .config file), compiled 
the kernel again.  After rebooting, my transfer rates were still 15 
megs/second.  So, my question is - why were they so much faster in debian, 
and how can I replicate that in redhat?
					--A. Valys