From owner-freebsd-hackers  Wed Apr  4  8:22:37 2001
Delivered-To: freebsd-hackers@freebsd.org
Received: from mokona.furryterror.org (cr934547-a.flfrd1.on.wave.home.com [24.112.247.163])
	by hub.freebsd.org (Postfix) with ESMTP id E1AB237B719
	for <freebsd-hackers@freebsd.org>; Wed,  4 Apr 2001 08:22:33 -0700 (PDT)
	(envelope-from afong@furryterror.org)
Received: from afong by mokona.furryterror.org with local (Exim 3.12 #1 (Debian))
	id 14kp73-0004up-00; Wed, 04 Apr 2001 11:22:25 -0400
Subject: Re: Acenic driver questions
In-Reply-To: <20010404090602.A19240@panzer.kdm.org> from "Kenneth D. Merry" at
 "Apr 4, 2001 09:06:02 am"
To: "Kenneth D. Merry" <ken@kdm.org>
Date: Wed, 4 Apr 2001 11:22:25 -0400 (EDT)
Cc: freebsd-hackers@FreeBSD.ORG
X-Mailer: ELM [version 2.4ME+ PL66 (25)]
MIME-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Message-Id: <E14kp73-0004up-00@mokona.furryterror.org>
From: Amy Fong <afong@furryterror.org>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

> On Wed, Apr 04, 2001 at 09:48:24 -0400, Amy Fong wrote:
> > Question about the acenic driver. In if_ti.c, there's ti_mem
> > which is currently used to load the firmware onto the card. What
> > I'm trying to do is to use take advantage of the window base/window
> > from the registers on the tigon and write to a particular segment of 
> > the memory. From what I've seen so far, it looks like I should be
> > able to do this using ti_mem to do this but my experimentations
> > don't seem to be working. I know that Linux acenic driver has 
> > patches available for using the window/winbase to read the nic's
> > tracing ring buffer so I'm thinking that I should be on the right
> > track.
> > 
> > Does anyone have any experience/suggestions?
> 
> Look at the Tigon driver diffs in this patch set:
> 
> http://people.FreeBSD.org/~ken/zero_copy/zero_copy.diffs.20010124
> 
> In particular, look at the ti_copy_mem() function.
> 
> Ken
> -- 
> Kenneth Merry
> ken@kdm.org
> 

Thanks! I should be kicking myself right now. I looked at the zero copy
code a few months back and totally forgot about it.

While I'm wasting bandwidth, I've got another question. I've noticed
that if I use up too much stack space, the freebsd kernel (4.2) seems to
crash very easily. Specially, if I create an array of size N within a
function, once the function gets invoked, my machine just reboots.
How do I find out how much stack space I've got? I'm assuming that it
_is_ a stack issue. :)

Amy

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message