Date: Mon, 24 Dec 2001 09:28:09 -0800 (PST) From: Matthew Dillon <dillon@apollo.backplane.com> To: Poul-Henning Kamp <phk@critter.freebsd.dk> Cc: Peter Jeremy <peter.jeremy@alcatel.com.au>, David Greenman <dg@root.com>, Bruce Evans <bde@zeta.org.au>, Mike Silbersack <silby@silby.com>, cvs-committers@FreeBSD.ORG, cvs-all@FreeBSD.ORG Subject: Re: cvs commit: src/sys/dev/sio sio.c Message-ID: <200112241728.fBOHS9s06849@apollo.backplane.com> References: <90234.1009211505@critter.freebsd.dk>
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:You have obviously not done this, or if you have, the method is not
:good enough to reveal the #1 unsolvable problem with interrupt
:latency.
Poul, you are an idiot. Not only have I done this, I've done it
a whole lot. I've also WRITTEN bit-wise async serial drivers (and
software analog 4-phase encoders and decoders for that matter),
and I've built async serial hardware from scratch, complete with 16x
sampling. I've written serial drivers in assembly for half a dozen
cpu architectures, including i386, and even wrote one or two in straight
machine code in my old PET, C64, and Amiga days.
:Bruce has correctly identified that problem with a simpler setup
:btw, but I am giving you the chance to prove me wrong by not telling
:you what I'm talking about yet. All you have to prove that you
:have actually done your measurement and analyzed the results is to
:tell us what this particular source of trouble is.
I don't have to prove a goddamn thing to you Poul. Two people have
told you are wrong, and a 2nd year EE student would have no problem
understanding our descriptions of how to do it, so excuse me if I
don't give a rats ass what you think. $1000 hardware? Bullshit.
-Matt
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