Bug 10895

Summary:	sis 191 mtu bug
Product:	Drivers	Reporter:	WIPAT SRUTIPROM (wipat.s)
Component:	Network	Assignee:	drivers_network (drivers_network)
Status:	RESOLVED OBSOLETE
Severity:	high	CC:	alan, dmamonov, juanjo, katar, okurzweg, pterjan
Priority:	P1
Hardware:	All
OS:	Linux
Kernel Version:	3.2	Subsystem:
Regression:	No	Bisected commit-id:

Description WIPAT SRUTIPROM 2008-06-12 03:29:22 UTC

Latest working kernel version: ??
Earliest failing kernel version: ??
Distribution: ubuntu 8.04
Hardware Environment: many built-in sis 191 
Software Environment: linux
Problem Description:
incorrect MTU size. Command 'ifconfig eth0' show MTU:1500,
but network failed with packet large more than 1024.
Modifying the mtu of the ethernet interface to 1024 
with command 'ifconfig eth0 mtu 1024' make it to work.

Steps to reproduce:

Comment 1 Pascal Terjan 2009-05-29 16:46:22 UTC

Hmm here I have the bug but it works fine up to 1496

Comment 2 okurzweg 2009-12-23 23:17:13 UTC

Same for me, 1496 is the highest value. Tested on 2.6.31.6, fedora-based

Comment 3 Alan 2010-01-19 18:08:23 UTC

Are you using vlans ?

Comment 4 Pascal Terjan 2010-01-19 18:19:13 UTC

No

Comment 5 dmamonov 2010-03-01 20:12:47 UTC

During the attemptions to ping or other actions, which mean the adoption of the package with the MTU size of interface (1500), the frame isn't accepted and there is an increasing of value error and frame by one in ifconfig output. By practical consideration was cleared up, that 4 last bytes aren't able to get throught, as the maximum size of delivered ip package can't be more than 1496 bytes (from 1500 supposed to be), and accordingly to it, the size of the ethernet frame can't be more than 1510 (from 1514 supposed to be) bytes.The tests of this hardware in the alternative operating system (windows 7) have shown us the positive result and pointed on the correct work of hardware and the communication medium.

System: Ubuntu Karmic 9.10 amd64
Kernel: 2.6.31-20-generic
Hardware: Laptop Asus F5SL
Network Adapter: Silicon Integrated Systems [SiS] 191 Gigabit Ethernet Adapter (rev 02):

00:04.0 Ethernet controller: Silicon Integrated Systems [SiS] 191 Gigabit Ethernet Adapter (rev 02)
 Subsystem: ASUSTeK Computer Inc. Device 1815
 Flags: bus master, medium devsel, latency 0, IRQ 19
 Memory at fddfcc00 (32-bit, non-prefetchable) [size=128]
 I/O ports at cc00 [size=128]
 Capabilities: <access denied>
 Kernel driver in use: sis190
 Kernel modules: sis190

ps. On 32-bit kernel everything works fine.
pps. May be related: http://bugzilla.kernel.org/show_bug.cgi?id=11509

Comment 6 Juan Jose Pablos 2010-04-21 00:32:48 UTC

This seems the same as Bug 10694

Comment 7 Alan 2012-06-13 14:27:29 UTC

*** Bug 13862 has been marked as a duplicate of this bug. ***

Comment 8 Alan 2012-06-27 10:49:14 UTC

*** Bug 43731 has been marked as a duplicate of this bug. ***

Comment 9 Juan Jose Pablos 2013-12-19 19:22:47 UTC

Shame, that we could not find the problem.But I am sure that bug still there