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1) I'm using the aic7xxx driver that comes with RedHat6.2 version 5.1.28/3.2.4 (ripped from dmesg). It's running as a module.
2) I don't have any other non-Ultra2 on the chain... Well OK I do, but I removed them and didn't get any increase in performance. In other words I removed all my SCSI devices, save the hard drive, and then ran the latest hdparm test that I put in my previous post.
Distribution: Debian, Red Hat, Slackware, Fedora, Ubuntu
Here is a great tip for those of you with IDE drives. I just benchmarked my laptop and got the following
64 MB in 20.04 seconds = 3.19 MB/sec
Now I know that laptops usually ship with pretty slow drives, but I have a fairly nice laptop and this seemed too low. I checked the settings on the hard drive and noticed 2 things.
1)The drive wasn't using 32-bit I/O and 2) The drive was not using DMA. If this is also the case for you type
hdparm -c 1 -d 1 -k 1 /dev/hda
My results after this simple change?
64 MB in 6.53 seconds = 9.80 MB/sec
Over a 300% speed increase! You will need to put the hdparm line in your startup scripts if you don't want to type it after every reboot.
Open a term window and type hdparm -c 1 -d 1 -k 1 /dev/hda
and watch the speed increase... that is unless your install got the drives correct to begin with... Let me know if you need to have this happen with every reboot... cause that will clear it...