[ale] Re: [ale] boot parms ide=???

[John Wells]

Sounds like Dow is a prime candidate for writing the How-to "Tuning Drive
I/O with hdparm".

Dow, can you have it finished by this afternoon, so I can play tonight? :-)

John

Dow Hurst said:
> 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
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> Chemistry Department SC428  Email:dhurst at kennesaw.edu
> Kennesaw State University         Dow.Hurst at mindspring.com
> Kennesaw, GA 30144
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