Subject: options MCLSHIFT=13 vs. macppc
To: None <>
From: Jeff Rizzo <>
List: port-macppc
Date: 11/21/2005 17:02:41
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In attempting to diagnose why I'm having jumbo-frame problems with a wm
interface on my G4/466 running -current (~24h old), I tried compiling a
kernel with "options MCLSHIFT=13", in hopes it would allow me to ping
across the jumbo-frame link with packets larger than 2002 bytes.

However, upon booting a kernel which is basically GENERIC with "options
MCLSHIFT=13", the boot hangs thusly:

Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005
    The NetBSD Foundation, Inc.  All rights reserved.
Copyright (c) 1982, 1986, 1989, 1991, 1993
    The Regents of the University of California.  All rights reserved.

NetBSD 3.99.11 (GENERIC.MCL) #2: Mon Nov 21 16:44:55 PST 2005
total memory = 1024 MB
avail memory = 987 MB

...then nothing.  A kernel with MCLSHIFT=12 seems to boot and work OK
(although it doesn't fix my jumbo frame issue - on a link with MTU 4500,
I still can't get ping packets larger than 2002 bytes across!  "cksum:
out of data" from every packet)

So, anyone else see this?  Should I send-pr?  How should I go about
troubleshooting this, anyway?  :)


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