Re: [PARPORT] parport-scsi release 0.02

Philip Blundell (
Mon, 19 Oct 1998 11:33:25 +0200

>"port cache" algo. Currently I cache the parallel port base address and
>perform direct IO based on this. If I had to resolve the port base address
>each time I wanted to access an IO port the look-up cripples the driver.

Is it really that bad? I guess two pointer chases is a bit much but I'd
expect the time to do that to be dwarfed by the time for the ISA cycle.

I'd be interested in measurements of performance for your direct I/O method
against going through parport. If there really is a problem then I'll
certainly have a think about ways to get the overhead down.

>The question I have, does anyone use parport with a parallel port driver other
>than parport_pc AND have a ZIP drive?

Not that I'm aware of but this may change. Some of the m68k people might well
be keen on being able to use Zip drives.


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This archive was generated by hypermail 2.0b3 on Wed 30 Dec 1998 - 10:18:37 EST