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Date: Sun, 19 Nov 2000 22:46:23 +0100
From: Vojtech Pavlik <vojtech@suse.cz>
To: Pavel Machek <pavel@suse.cz>
Cc: linux-kernel@vger.kernel.org
Subject: Re: rdtsc to mili secs?
Message-ID: <20001119224623.A1418@suse.cz>
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In-Reply-To: <20001119212404.A1175@bug.ucw.cz>; from pavel@suse.cz on Sun, Nov 19, 2000 at 09:24:04PM +0100
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On Sun, Nov 19, 2000 at 09:24:04PM +0100, Pavel Machek wrote:
> Hi!
> 
> > > > Anyway, this should be solvable by checking for clock change in the
> > > > timer interrupt. This way we should be able to detect when the clock
> > > > went weird with a 10 ms accuracy. And compensate for that. It should be
> > > > possible to keep a 'reasonable' clock running even through the clock
> > > > changes, where reasonable means constantly growing and as close to real
> > > > time as 10 ms difference max.
> > > > 
> > > > Yes, this is not perfect, but still keep every program quite happy and
> > > > running.
> > > 
> > > No. Udelay has just gone wrong and your old ISA xxx card just crashed
> > > whole system. Oops.
> > 
> > Yes. But can you do any better than that? Anyway, I wouldn't expect to
> > be able to put my old ISA cards into a recent notebook which fiddles
> > with the CPU speed (or STPCLK ratio).
> 
> PCMCIA is just that: putting old ISA crap into modern hardware. Sorry.

Not really, fortunately. There are ISA-sytle NE2000's on PCMCIA, but
1) You know that you have a card there via the PCMCIA services and
2) They're not the old crappy NE2000's that'd die on a random read anyway.

-- 
Vojtech Pavlik
SuSE Labs
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