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Re: Slower BogoMIPS rating on 1.3.62 than on 1.2.10 :-)

Subject: Re: Slower BogoMIPS rating on 1.3.62 than on 1.2.10 :-)
From: Systemkennung Linux <>
Date: Sat, 17 Feb 1996 02:52:30 +0100 (MET)
In-reply-to: <> from "Warner Losh" at Feb 15, 96 11:48:05 pm

> I wish it had been that easy.  I increased TIMEOUT_CONST by a factor
> of 10 and it didn't help.  I keep getting 0xff on reads from the
> keyboard port.  Something is messed up with my interrupts, I think, or
> maybe there are bugs in the keyboard code that I'm tripping over, but
> I think the former is more likely.  I tried enabling more interrupts
> in the IM field of the status register, and that didn't help either.
> Since it was none of the easy and trivial fixes, it must mean I'll
> have to get some time when I have a brain and hack rpc44.S....

Your board is based on a PC chipset which means than keyboard controller
access via ports is dead slow.  On the Jazz chipset all this stuff is
implemented in a different way and therefore MUCH faster.  That's why we
needed to increase TIMEOUT_CONST.


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