[ale] boot parms ide=???

[Dow Hurst]

Geof,
If you set the kernel ide parameter to 66 then I wonder if you limit 
throughput to 66 max.  You could check this with hdparm by booting with 
different ide parm values and just testing transfer rates.  I know that 
tuning my wife's SuSE 7.3 install with hdparm I went from 6Mb to ~25Mb 
per sec just by setting dma.  On my SuSE 8.1 machine I found dma already 
set and a transfer rate of ~40Mb per sec was pretty consistent.  This is 
limited by the bus so you could back calculate where the limiting factor 
would be.  A video card data transfer would be another way to test 
throughput for a PCI based card.  Does AGP go thru the bus or bypass it 
on another faster route?  I don't know enough about how this stuff works 
now.  I used to have the old 86, 286, and 386 stuff down pretty good as 
to how it works. ;-)

One thought is if you have a faster IDE controller are you loading the 
right kernel driver to take advantage of the speed available?  Is there 
a driver specific for your controller?  I know the RAID cards have 
faster controllers and specific drivers since I dealt with the HPT372 
driver on the motherboard I'm using now.  My 40Mb specs are not from the 
133 RAID HPT372 controller but the 100 main board controller.

Dow


Geoffrey wrote:

> I've been trying to research the various boot parameters available. 
> Particularily regarding ide parms.  I find references to a doc 
> README.ide in the kernel source, but I've got two sets of source, 
> neither has the file.  I finally tracked one down, but no reference to 
> the ide parms I'm looking for.
>
> In particular, I had a box that had an ata66 controller and passing 
> ide=66 was recognized.
>
> Following that process I have another box with an ata100 controller, 
> but when attempting ide=100, I receive an error that this is invalid.  
> Valid values are 20-66.
>
> I've seen references to ide=100 in searches, so I assumed this was valid.
>
> These are 2.4.19 kernels, pretty current.
>
> Anyone care to shed some light on this??
>

-- 
__________________________________________________________
Dow Hurst                  Office: 770-499-3428
Systems Support Specialist    Fax: 770-423-6744
1000 Chastain Rd., Bldg. 12
Chemistry Department SC428  Email:dhurst at kennesaw.edu
Kennesaw State University         Dow.Hurst at mindspring.com
Kennesaw, GA 30144
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