From rhh@ct.picker.com  Sun Jan  4 19:10:47 1998
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Message-Id: <19980104220920.10414@ct.picker.com>
Date: Sun, 4 Jan 1998 22:09:20 -0500
From: Randall Hopper <rhh@ct.picker.com>
To: FreeBSD-gnats-submit@freebsd.org
In-Reply-To: <199712241427.OAA01523@stealth.hopper.net>; from rhh@ct.picker.com on Wed, Dec 24, 1997 at 02:27:57PM +0000
Subject: Re: Very slow throughput & transmit underflows w/ lnc driver
References: <199712241427.OAA01523@stealth.hopper.net>

>Number:         5432
>Category:       kern
>Synopsis:       Re: Very slow throughput & transmit underflows w/ lnc driver
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    steve
>State:          closed
>Quarter:        
>Keywords:       
>Date-Required:  
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Thu Jan  8 14:30:08 PST 1998
>Closed-Date:    Sun Feb 1 12:06:41 PST 1998
>Last-Modified:  Sun Feb  1 12:11:17 PST 1998
>Originator:     
>Release:        
>Organization:
>Environment:
>Description:
>How-To-Repeat:
>Fix:
>Release-Note:
>Audit-Trail:
Responsible-Changed-From-To: gnats-admin->freebsd-bugs 
Responsible-Changed-By: steve 
Responsible-Changed-When: Thu Jan 8 14:42:43 PST 1998 
Responsible-Changed-Why:  
Misfiled PR. 
State-Changed-From-To: open->closed 
State-Changed-By: steve 
State-Changed-When: Sun Feb 1 12:06:41 PST 1998 
State-Changed-Why:  
The orginator stated the problem was in the machine's Award BIOS. 
Setting the "CHIPSET GLOBAL FEATURES" option to DISABLED fixed the 
problem.  Any DMA/BIOS experts out there that can explain why? 
>Unformatted:
rhh@ct.picker.com:
 |>Submitter-Id:   current-users
 |>Originator:     Randall Hopper
 |>Organization:   self
 |>Confidential:   no
 |>Synopsis:       Very slow throughput & transmit underflows w/ lnc driver
 |>Severity:       serious
 |>Priority:       medium
 |>Category:       kern
 |>Release:        FreeBSD 3.0-971208-SNAP i386
 |>Class:          sw-bug
 |>Environment: 
 |
 |	Stock SNAP install.
 |	Allied Telesyn AT-1500 (AMD Lance chipset)

I still don't understand what's going on, but changing an Award BIOS
setting (GLOBAL CHIPSET FEATURES) from ENABLED to DISABLED fixed the
slow transfer speed (likely related to DMA somehow, but I don't know any
specifics).

Randall Hopper
rhh@ct.picker.com
