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Date: Thu, 1 Feb 2001 00:12:28 -0800 (PST)
From: Andre Hedrick <andre@linux-ide.org>
To: Tom Leete <tleete@mountain.net>
cc: Alan Cox <alan@lxorguk.ukuu.org.uk>, David Ford <david@linux.com>,
        Stephen Frost <sfrost@snowman.net>,
        LKML <linux-kernel@vger.kernel.org>
Subject: Re: 2.4.x and SMP fails to compile (`current' undefined)
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Make it and I will care and post it on kernel.org for you.
I need that patch soon.

On Thu, 1 Feb 2001, Tom Leete wrote:

> Alan Cox wrote:
> > 
> > > It's not an incompatibility with the k7 chip, just bad code in
> > > include/asm-i386/string.h. in_interrupt() cannot be called from there.
> > 
> > The string.h code was fine, someone came along and put in a ridiculous loop
> > in the include dependancies and broke it. Nobody has had the time to untangle
> > it cleanly since
> 
> Yes, bitrot. I don't see a rearrangement of system headers happening in 2.4.
> I'm pretty sure if I committed such a patch it would have no measurable
> lifetime.
> 
> > 
> > > I have posted a patch here many times since last May. Most recent was
> > > Saturday.
> > 
> > uninlining the code is too high a cost.
> 
> I question that. Athlon does branch prediction on call targets, function
> calls are cheap. 3dnow saves 25%-50% of cycles on a copy. How many function
> calls can be paid for with 1000 cycles or so?
> 
> My patch still inlines the standard string const_memcpy for the case of
> small known length.
> 
> If I configure SMP for a UP box, performance is clearly not my first
> concern. If I have a real SMP Athlon system, performance should not improve
> by only using one processor.
> 
> How about we get it to build before we optimize it?
> 
> Regards,
> Tom
> 
> -- 
> The Daemons lurk and are dumb. -- Emerson
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> 

Andre Hedrick
Linux ATA Development

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