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

[James Sumners]

not the best in the world but it is a good start: 
http://linux.oreillynet.com/pub/a/linux/2000/06/29/hdparm.html

On Wed, 19 Feb 2003 10:13:17 -0500 (EST)
"John Wells" <jb at sourceillustrated.com> wrote:

> 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
> > 1000 Chastain Rd., Bldg. 12
> > Chemistry Department SC428  Email:dhurst at kennesaw.edu
> > Kennesaw State University         Dow.Hurst at mindspring.com
> > Kennesaw, GA 30144
> > *********************************
> > *Computational Chemistry is fun!*
> > *********************************
> >
> >
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> > http://www.ale.org/mailman/listinfo/ale
> 
> 
> 
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