Re: IDE tuning - How?

[Paul Furness <paul.furness@vil.ite.mee.com>]

Yeah, the controller does do 133. I tried idebus=133 but it isn't
recognised by the ide code as a valid option.

However, hdparm _might_ do what I wanted, I just didn't realise it; I
added "hdparm -X70 /dev/hda" to my startup script and it _appears_ to
have made things go faster. On the other hand, an hdparm -t still shows
the same transfer rates as before. 




On Fri, 2003-04-04 at 12:39, Jamie Harris wrote:
> Don't you just want to do the idebus=133 append agagin or am I missing
> something?  You IDE controller is capable of 133 yeah?  Not just 100?
> 
> cheers
> 
> Jamie...
> 
> > Hi.
> >
> > Can anyone tell me how to tell the linux kernel that my IDE hard disk
> > and interface are ATA133 not ATA100?
> >
> > I first noticed a problem after installing Debian on my development
> > system. The install took ages, but after the install the whole system
> > was very jerky and slow (this was on a P4 1.9G with lots of memory, so I
> > figured it wasn't CPU problems. Top confirmed this). Further
> > investigation showed that it was only slow when accessing the hard disk.
> > hdparm -t /dev/hda told me that it was going at between 3 and 4 M/s
> > which is scarily slow.
> >
> > I looked carefully through the boot messages, and came across "assuming
> > IDE bus speed 33MHz. override with idebus=xx" (Sorry, the wording might
> > be a little different but the message was essentially that). I therefore
> > added "idebus=66" to my kernel boot up line in grub.conf, and sure
> > enough it booted and told me "assuming IDE bus speed 66MHz." According
> > to hdparm, it is now giving me around 40MB/s, which is a definite
> > improvement.
> >
> > So far so good. But then I noticed that is detects the hard disk as
> > ATA100. I know it's a 133, as I only bought it recently and I know what
> > model I bought (Diamond max +9 120GB ATA133). I am assuming (possibly
> > naively) that if the IDE module in the kernel is only using 100, I'm
> > only getting about 66% of the performance I should. ( I know, nothing's
> > ever linear...)
> >
> > I tried adding "ide0=ata133" to the kernel params, but it makes no
> > difference. The IDE code documentation doesn't seem to help beyond
> > telling me to do what I have already tried.
> >
> > Am I missing something obvious?
> >
> >
> > Paul.
> >
> >
> > -
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