Re: ibook system bus speed
On Thu, 2005-03-10 at 13:43 +0100, Christophe Branchereau wrote:
> Hello.
>
> I own an ibook clamshell special edition 366 MHz, running sarge and a
> 2.6.8 kernel since a long time now.
>
> Today, I noticed by paying attention to dmesg this message:
>
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
It's a crap message, forget it. The IDE layer tries to have it's own
idea of the PCI bus speed in fact, which then can be used by some IDE
drivers to calculate various timings. But the drivers for the pmac
chipset doesn't need/use this value, which is crap in the first place.
> A quick look on google told me that the system bus speed of this model is 66MHz, as
> http://www.apple-history.com specifies.
>
> Isn't it degrading disk performances a lot?
> As the dma mode that was set to 16 Bits by default, for example.
>
> Before doing (maybe?) something stupid, I'd like to know if someone knows better
> than I do, any more infos would be welcome.
>
> Christophe
> --
>
>
--
Benjamin Herrenschmidt <benh@kernel.crashing.org>
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