Ah, well I just added that based on the end of this boot message:
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> >kernel: VP_IDE: ATA-66/100 forced bit set (WARNING)!!
> I'm sure this is just telling you that you passed the ide0=ata66
> parameter. Usually it is best not to do this--the driver should run
> your chipset/drive as fast as possible without 'forcing' the
> configuration. Of course, testing with hdparm -t is considered the
> definitive way to check how fast the interface is running.
If I don't add it hdparm -t /dev/hda reports:
Timing buffered disk reads: 64 MB in 16.46 seconds = 3.89 MB/sec
Then if I do hdparm -d1 -X66 /dev/hda I get:
setting using_dma to 1 (on)
setting xfermode to 66 (UltraDMA mode2)
using_dma = 1 (on)
[root@nano /root]# hdparm -t /dev/hda
Timing buffered disk reads: 64 MB in 4.04 seconds = 15.84 MB/sec
Now if I add it via append, reboot and do hdparm -t I get:
Timing buffered disk reads: 64 MB in 3.70 seconds = 17.30 MB/sec
This last difference is consistently better. Weird.
All your other bets were right too.
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