From: "Jörn Engel" <joern@wohnheim.fh-wedel.de>
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: Dan Parks <Dan.Parks@CAMotion.com>, SA <no_spam@ntlworld.com>,
linux-kernel@vger.kernel.org
Subject: Re: interrupt latency ?
Date: Tue, 11 Feb 2003 12:59:07 +0100 [thread overview]
Message-ID: <20030211115907.GA29660@wohnheim.fh-wedel.de> (raw)
In-Reply-To: <Pine.LNX.3.95.1030210132543.8724A-100000@chaos.analogic.com>
On Mon, 10 February 2003 13:30:49 -0500, Richard B. Johnson wrote:
> On Mon, 10 Feb 2003, [iso-8859-1] J?rn Engel wrote:
>
> > An assembler interrupt handler that saves registers, tweaks a couple
> > of bits, restores registers and gets the hell out of here should be in
> > the order of 100 cycles, maybe less. Why is linux wasting all this
> > time?
>
> FYI execution speed and interrupt latency doesn't scale well. You
> are most always I/O bound somewhere.
Ack. It always takes a moment to get used to these facts.
Jörn
--
Beware of bugs in the above code; I have only proved it correct, but
not tried it.
-- Donald Knuth
prev parent reply other threads:[~2003-02-11 11:49 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2003-02-07 18:50 SA
2003-02-10 13:58 ` Jörn Engel
[not found] ` <1044889126.1438.460.camel@localhost>
2003-02-10 15:43 ` Jörn Engel
2003-02-10 16:20 ` Richard B. Johnson
2003-02-10 17:08 ` Jörn Engel
2003-02-10 18:30 ` Richard B. Johnson
2003-02-11 11:59 ` Jörn Engel [this message]
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