Description of problem:
Unable to get true ATA100 performance from RedHat 7.3.  No matter what I do with
hdparm, I still get about 22 MB/sec transfer rate from the ATA100 IDE drive,
which is about what I get from my other two systems, both of which are only
ATA33-capable.

Version-Release number of selected component (if applicable):


How reproducible:
Guaranteed.  Cannot get any better performance! ;-<

Steps to Reproduce:
1.Install RedHat 7.3
2.Boot.  
3.Run hdparm -t /dev/hda1 as root
4.See poor result.
5.Be disappointed.

I seem to recall that there was a parameter I could pass to the kernel during
the boot process, by appending it to the end of the appropriate line in
/etc/grub.conf like this: (added parameter highlighted by "^^^^^^^^^"



    title Red Hat Linux (2.4.18-24.7.xbigmem)
        root (hd0,0)
        kernel /vmlinuz-2.4.18-24.7.xbigmem ro root=/dev/hda2 hdc=ide-scsi ide=ata66
^^^^^^^^^
        initrd /initrd-2.4.18-24.7.xbigmem.img


Actual results:

Have not tried it, yet.  Don't want to trash the central server with an
incorrect parameter!

Expected results:
data transfer rate of > 40 MB/s, as reported by hdparm -t /dev/hda

Additional info:
I know I reported this once before and Dave Ledford (I think?) kindly sent me
the instructions regarding a parameter similar to the above that fixed all my
problems and brought about World Peace (almost), but I cannot find that e-mail
or the original bug.  I'm really sorry to bother you with this again, and I
really do appreciate it!