netdev - Re: Bogus frames transmitted with r8169 & fragmentation & large mtu

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Date:	Thu, 16 Feb 2012 13:04:48 +0100
From:	Francois Romieu <romieu@...zoreil.com>
To:	hayeswang <hayeswang@...ltek.com>
Cc:	"'Eric Dumazet'" <eric.dumazet@...il.com>,
	"'Nick Bowler'" <nbowler@...iptictech.com>, netdev@...r.kernel.org
Subject: Re: Bogus frames transmitted with r8169 & fragmentation & large mtu

Francois Romieu <romieu@...zoreil.com> :
[...]
> I am testing it now.

It does not fix the problem. It seems to make a difference but I still
see a few percents packet loss. The pattern has changed a bit too: there
are more bogus IP fragment offsets.

Trying with 'ping -qf -c 100 -l 2 -s 65507 10.0.7.1'

Good:

239   0.020107     10.0.7.1 -> 10.0.7.5     IP Fragmented IP protocol (proto=ICMP 0x01, off=0, ID=9f97)
240   0.020116     10.0.7.1 -> 10.0.7.5     IP Fragmented IP protocol (proto=ICMP 0x01, off=8976, ID=9f97)
241   0.020122     10.0.7.1 -> 10.0.7.5     IP Fragmented IP protocol (proto=ICMP 0x01, off=17952, ID=9f97)
242   0.020128     10.0.7.1 -> 10.0.7.5     IP Fragmented IP protocol (proto=ICMP 0x01, off=26928, ID=9f97)
243   0.020134     10.0.7.1 -> 10.0.7.5     IP Fragmented IP protocol (proto=ICMP 0x01, off=35904, ID=9f97)
244   0.020139     10.0.7.1 -> 10.0.7.5     IP Fragmented IP protocol (proto=ICMP 0x01, off=44880, ID=9f97)
245   0.020145     10.0.7.1 -> 10.0.7.5     IP Fragmented IP protocol (proto=ICMP 0x01, off=53856, ID=9f97)
246   0.020150     10.0.7.1 -> 10.0.7.5     ICMP Echo (ping) reply    (id=0x04c7, seq(be/le)=16/4096, ttl=64)

Bad:

247   0.020809     10.0.7.5 -> 10.0.7.1     IP Fragmented IP protocol (proto=ICMP 0x01, off=0, ID=dce9)
248   0.020977     10.0.7.5 -> 10.0.7.1     IP Fragmented IP protocol (proto=ICMP 0x01, off=8976, ID=dce9)
249   0.021046     10.0.7.5 -> 10.0.7.1     IP Fragmented IP protocol (proto=ICMP 0x01, off=17952, ID=dce9)
250   0.021192     10.0.7.5 -> 10.0.7.1     IP Fragmented IP protocol (proto=ICMP 0x01, off=26928, ID=dce9)
251   0.021199     10.0.7.5 -> 10.0.7.1     IP Fragmented IP protocol (proto=ICMP 0x01, off=35904, ID=dce9)
252   0.021291     10.0.7.5 -> 10.0.7.1     IP Fragmented IP protocol (proto=ICMP 0x01, off=44880, ID=dce9)
253   0.021298     10.0.7.5 -> 10.0.7.1     IP Fragmented IP protocol (proto=ICMP 0x01, off=62832, ID=dce9)

So far I have only seen it with the 2nd and last fragment.

-- 
Ueimor
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