From: Pavel Machek <pavel@suse.cz>
To: John Bradford <john@grabjohn.com>
Cc: linux-kernel@vger.kernel.org, pgw99@doc.ic.ac.uk
Subject: Re: PATCH : LEDs - possibly the most pointless kernel subsystem ever
Date: Wed, 30 Jul 2003 19:44:57 +0200 [thread overview]
Message-ID: <20030730174457.GI10276@atrey.karlin.mff.cuni.cz> (raw)
In-Reply-To: <200307301608.h6UG8YQJ000339@81-2-122-30.bradfords.org.uk>
Hi!
> > But this kind of blinkenlights needed pretty fast LEDs. (At 486 time
> > I decided that parport on ISA is fast enough..)
>
> I'll buy some LEDs and build a parallel port connected LED panel
> tomorrow... Do you think the overhead of driving the LEDs would have
> too much of a negative effect on system performance? If so, or if
> we
I'm not sure. At 486 days I was pretty sure it did not matter. These
days you might get 10% slowdown on some microbenchmark, or something
like that. I do not think it can slow down common tasks.
My construction of LED lights is extremely flaky, and I'm afraid of
burning printer port. At 486 days ports were expected to survive such
abuse. Not sure if todays EPP/wtf ports can handle that.
Pavel
--
Horseback riding is like software...
...vgf orggre jura vgf serr.
next prev parent reply other threads:[~2003-07-30 17:45 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-07-30 16:08 PATCH : LEDs - possibly the most pointless kernel subsystem ever John Bradford
2003-07-30 17:44 ` Pavel Machek [this message]
2003-07-30 18:50 ` Marc Giger
2003-07-30 19:05 ` Herbert Pötzl
2003-07-30 22:22 ` Brian McGroarty
2003-07-30 18:56 ` Herbert Pötzl
2003-07-30 19:02 ` Pavel Machek
2003-07-30 19:06 ` Marc Giger
2003-07-30 19:16 ` Herbert Pötzl
2003-07-31 8:31 ` jw schultz
-- strict thread matches above, loose matches on Subject: below --
2003-07-30 18:50 John Bradford
2003-07-30 15:50 John Bradford
2003-07-30 12:27 "Andrey Borzenkov"
2003-07-29 20:38 John Bradford
2003-07-29 20:37 ` Andries Brouwer
2003-07-29 21:34 ` Philip Graham Willoughby
2003-07-29 20:40 ` Randolph Bentson
2003-07-29 21:15 ` Ryan Flowers
2003-07-29 20:43 ` Eli Carter
2003-07-30 6:09 ` Tomas Szepe
2003-07-30 6:37 ` Helge Deller
2003-07-29 19:15 John Bradford
2003-07-29 19:51 ` Tim Hockin
2003-07-29 20:09 ` Joel Jaeggli
2003-07-29 21:20 ` Kent Borg
2003-07-29 21:44 ` Philip Graham Willoughby
2003-07-30 21:44 ` Mike Jagdis
2003-07-30 12:15 ` Pavel Machek
2003-07-29 15:17 Philip Graham Willoughby
2003-07-29 18:00 ` Pavel Machek
2003-07-30 11:45 ` Jamey Hicks
2003-07-30 12:27 ` Pavel Machek
2003-07-30 6:36 ` CaT
2003-07-30 13:00 ` Andries Brouwer
2003-07-30 13:20 ` CaT
2003-07-30 23:28 ` Greg KH
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