Re: sis900 ethernet driver/IP stack getting REALLY confused...

From: Rob Landley (
Date: Fri May 03 2002 - 08:23:16 EST

On Friday 03 May 2002 02:23 pm, Sebastian Droege wrote:

> Hi,
> I have a very similar problem... when I ping the box with the sis900
> ethernet adapter everything wents fine except ~3 % of the pings. This pings
> need 10 times longer to get back to me than the other (eg. 72 ms <-> 1004
> ms) There is no other network activity on the network
> And sometimes I get corrupted echo replies when there is traffic over the
> sis900...
> I hope this helps somehow...
> Bye

Yeah, that's what I'm seeing here too.

I'm 99% certain it's not a hardware problem, because:

A) It occurs on multiple motherboards (built in sis900).

B) A soft reboot makes the problem go away.

C) Unplugging the cat 5 cable and plugging it back in makes the problem start
manifesting, until the next reboot. (On the systems I've seen it on anyway,
I haven't tested otherwise healthy boxes to see if I can make them go nuts by
temporarily unplugging their ethernet cables, but if anybody thinks it would

D) The problem itself is packets getting delayed ~10 seconds. (I think the
ping corruption warning is just ping getting confused by the delay and
profound out-of-sequenceness, but in any case 10 second old packets aren't
interesting so if they went bad in storage it's a side issue...)

That smells like a driver problem to me, but I can't honestly say I have too
much of a clue in this area. I'm working with Advanced Clue Substitute at

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This archive was generated by hypermail 2b29 : Tue May 07 2002 - 22:00:21 EST