From: yodaiken@fsmlabs.com
To: "Richard B. Johnson" <root@chaos.analogic.com>
Cc: Mark Hounschell <markh@compro.net>,
"Wessler, Siegfried" <Siegfried.Wessler@de.hbm.com>,
"'linux-kernel@vger.kernel.org'" <linux-kernel@vger.kernel.org>
Subject: Re: interrupt latency
Date: Tue, 27 Aug 2002 13:54:01 -0600 [thread overview]
Message-ID: <20020827135400.A31990@hq.fsmlabs.com> (raw)
In-Reply-To: <Pine.LNX.3.95.1020827135107.10631A-100000@chaos.analogic.com>; from root@chaos.analogic.com on Tue, Aug 27, 2002 at 02:01:43PM -0400
On Tue, Aug 27, 2002 at 02:01:43PM -0400, Richard B. Johnson wrote:
> This cannot be. A stock kernel-2.4.18, running a 133 MHz AMD-SC520,
> (like a i586) with a 33 MHz bus, handles interrupts off IRQ7 (the lowest
> priority), from the 'printer port' at well over 75,000 per second without
> skipping a beat or missing an edge. This means that latency is at least
> as good as 1/57,000 sec = 0.013 microseconds.
Assuming you mean 75,000 then ...
Thats 0.013 MILLISECONDS which is 13 microseconds and its not likely.
I bet that your data source drops data or looks at some handshake
pins on the parallel connect.
--
---------------------------------------------------------
Victor Yodaiken
Finite State Machine Labs: The RTLinux Company.
www.fsmlabs.com www.rtlinux.com
next prev parent reply other threads:[~2002-08-27 19:51 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-08-27 9:58 Wessler, Siegfried
2002-08-27 14:11 ` Stephen Samuel
2002-08-27 17:16 ` Robert Schwebel
2002-08-27 21:44 ` Stephen Samuel
2002-08-27 17:41 ` Mark Hounschell
2002-08-27 18:01 ` Richard B. Johnson
2002-08-27 19:54 ` yodaiken [this message]
2002-08-27 20:44 ` Richard B. Johnson
2002-08-27 20:56 ` yodaiken
2002-08-27 22:47 ` Rogier Wolff
2002-08-28 12:18 ` Richard B. Johnson
2002-08-28 13:41 ` yodaiken
2002-08-28 14:25 ` Jonathan Lundell
2002-08-28 13:53 ` yodaiken
2002-08-28 15:02 ` Richard B. Johnson
2002-08-28 15:19 ` yodaiken
2002-08-28 15:31 ` Alan Cox
2002-08-28 15:37 ` Richard B. Johnson
2002-08-28 16:53 ` Randy.Dunlap
2002-08-28 12:42 ` Pavel Machek
2002-08-27 18:05 ` Dag Nygren
2002-10-30 23:50 Keith Adamson
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