Begin forwarded message:
Date: Thu, 6 Jan 2005 15:30:14 -0800
From: bugme-daemon@xxxxxxxx
To: bugme-new@xxxxxxxxxxxxxx
Subject: [Bugme-new] [Bug 4001] New: can't lower mtu of via_velocity
http://bugme.osdl.org/show_bug.cgi?id=4001
Summary: can't lower mtu of via_velocity
Kernel Version: 2.6.10
Status: NEW
Severity: high
Owner: jgarzik@xxxxxxxxx
Submitter: fadlouni@xxxxxxxxxxx
Distribution:
gentoo
Hardware Environment:
amd64
asus av8 motherboard
Software Environment:
x86_64 AMD Athlon(tm) 64 Processor 3500+ AuthenticAMD GNU/Linux
gcc 3.4.3
sys-libs/glibc-2.3.4.20041102
net-tools-1.60-r9
ifconfig 1.42
Problem Description:
trying to lower mtu of eth0 to anything lower than 1500 doesn't work:
/usr/src:/whoami
root
/usr/src:/ifconfig eth0 mtu 1499
SIOCSIFMTU: Invalid argument
/var/log/messages shows:
eth0: Invalid MTU.
via-velocity.h has:
#define VELOCITY_MIN_MTU (1514-14)
via-velocity.c has:
if ((new_mtu < VELOCITY_MIN_MTU) || new_mtu > (VELOCITY_MAX_MTU)) {
VELOCITY_PRT(MSG_LEVEL_ERR, KERN_NOTICE "%s: Invalid MTU.\n",
vptr->dev->name);
this explains the reason. however i tried changing the VELOCITY_MIN_MTU
to something like 64, then recompiled. now ifconfig accepts mtu 1400.
but nothing works afterwards. a simple ping to the gateway fails.
Steps to reproduce:
load via-velocity module, then
/usr/src:/ifconfig eth0 mtu 1499
SIOCSIFMTU: Invalid argument
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