sky2 large MTU problems...

From: Daniel J Blueman
Date: Fri May 19 2006 - 12:22:02 EST


I've found that when increasing the sky2 interface MTU beyond
somewhere around 6000-7500, packets can get truncated.

The interface is the internal interface on a NAT router - I've been
able to reproduce this with 2.6.16 and 2.6.17-rc4 when say sending an
email from gmail (via the web interface).

Hardware:

sky2 v1.3 addr 0xdfbfc000 irq 169 Yukon-EC (0xb6) rev 1

Symptoms:

# ifconfig lan0 mtu 7500
# tcpdump -ni lan0
08:38:13.595118 IP truncated-ip - 100 bytes missing! 192.168.0.3.1552
213.160.98.138.554: . 2700848741:2700850201(1460) ack 1729330122 win
64883

(then sending from gmail hangs)

Let me know if you need a more specific reproducer (eg a particular
URL); I can test changes too.
--
Daniel J Blueman
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