Re: [Sheflug] System bus speeds...

[Will Newton <xxxxx [at] xxxxxxxxxxxxxxxxxxxx>]

On Thursday 12 Sep 2002 1:17 am, Richard Stevenson wrote:

> Does anyone know if there's a way to convince the OS to tell me what speed
> the system bus is running at?  I've got this new workstation here (an IBM
> NetVista) with ATA100 disk, etc etc (Ooh, *shiny* :P).  The kernel's IDE
> code assumes a system bus speed of 33MHz, but I suspect that's way too
> low.  If it helps, the CPU has a 400MHz front-side bus, the RAM is
> PC133-compliant, and the vendor's "tech" specs, from their own web site,
> don't tell me anything else.  Any ideas?

If you are seeing this message (or similar):

ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx

The newer kernels add the "for PIO modes". Chances are you are not using PIO 
(programmed I/O) but DMA (you can check with hdparm).

Using the idebus parameter on the kernel command line is not recommended 
unless you really know what you are doing - it does not do what you might 
think.
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