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Re: IDE Bus Speed

Viestissä Maanantai 2. Joulukuuta 2002 03:45, Christopher Taylor kirjoitti:
> OK...where exactly does one change the hdparms at?  I'm a newbie at
> this...I got a "command not found" when I typed hdparm --help at the
> term.

You must be root to change the HD parameters.

>  I see in dmesg where it says both drives are transferring at 33
> MHz,

I think you misunderstand the message. My dmesg says:
"ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx"

This means that the PCI bus connecting to your disc controller runs at 33MHz, 
and this is used to time PIO mode transfers. It doesn't apply to DMA 
transfers and it doesn't mean the speed of drive transfers.

Another line in dmesg shows:
"hda: 78165360 sectors (40021 MB) w/2048KiB Cache, CHS=4865/255/63, UDMA(100)"

 The drive is running in 100MHz UDMA mode.

> I assume, as
> well, that the CPU-Memory Bus speed is not set somewhere by default,
> i.e. I have to specify it runs at 266MHz?

It's set in BIOS setup, Linux has nothing to do with it.

	Markku Kolkka
	markku kolkka koti soon fi

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