From owner-freebsd-questions  Sun Feb 26 12:06:50 1995
Return-Path: questions-owner
Received: (from majordom@localhost) by freefall.cdrom.com (8.6.9/8.6.6) id MAA01663 for questions-outgoing; Sun, 26 Feb 1995 12:06:50 -0800
Received: from Root.COM (implode.Root.COM [198.145.90.1]) by freefall.cdrom.com (8.6.9/8.6.6) with ESMTP id MAA01654 for <freebsd-questions@freebsd.org>; Sun, 26 Feb 1995 12:06:39 -0800
Received: from corbin.Root.COM (corbin.Root.COM [198.145.90.18]) by Root.COM (8.6.8/8.6.5) with ESMTP id MAA21137; Sun, 26 Feb 1995 12:05:38 -0800
Received: from localhost (localhost [127.0.0.1]) by corbin.Root.COM (8.6.9/8.6.5) with SMTP id MAA00692; Sun, 26 Feb 1995 12:05:38 -0800
Message-Id: <199502262005.MAA00692@corbin.Root.COM>
X-Authentication-Warning: corbin.Root.COM: Host localhost didn't use HELO protocol
To: brian@mediacity.com (Brian Litzinger)
cc: freebsd-questions@FreeBSD.org
Subject: Re: maxwait in if_ed.c not long enough 
In-reply-to: Your message of "Sun, 26 Feb 95 09:24:09 PST."
             <m0rimhV-000rbtC@easynet.com> 
From: David Greenman <davidg@Root.COM>
Reply-To: davidg@Root.COM
Date: Sun, 26 Feb 1995 12:05:31 -0800
Sender: questions-owner@FreeBSD.org
Precedence: bulk

>I was not sure which group I should post this too, being somwhat new
>to FreeBSD, so I thought I'd start here and hopefully get some direction
>if this is not the correct place.
>
>I recent upgraded my LAPTOP from a DX2/66 to a DX4/100 and begin
>getting
>
>    ed1: remote transmit DMA failed to complete
>
>After a number of these messages, the system would freeze up.
>
>The problem seems to be related to 'maxwait' in the if_ed.c file.
>
>I changed the two lines which read:
>
>        int     maxwait = 100;   /* about 120us */
>
>to
>
>        int     maxwait = 100*100/66;   /* about 120us */
>
>and this seemed to remedy the problem.

   Thanks. 100*100/66 is 151. I instead doubled the count to 200 (240us) - this
will hopefully handle extreme cases.

-DG