netdev - Re: Bug? GRE tunnel periodically won't transmit some packets

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Message-ID: <1320747938.2487.4.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
Date:	Tue, 08 Nov 2011 11:25:38 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Chris Siebenmann <cks@...toronto.edu>
Cc:	netdev@...r.kernel.org
Subject: Re: Bug? GRE tunnel periodically won't transmit some packets

Le mardi 08 novembre 2011 à 08:34 +0100, Eric Dumazet a écrit :
> Le mardi 08 novembre 2011 à 02:08 -0500, Chris Siebenmann a écrit :
> 
> >  Let me know if you want a full dump of 'ip link show' (with or
> > without verbosity).
> > 
> > 	- cks
> 
> Oh yes, I meant "ip -s -s link show dev extun"
> 
> to get detailed infos :
> 
> # ip -s -s link show dev ppp0
> 8: ppp0: <POINTOPOINT,MULTICAST,NOARP,UP,LOWER_UP> mtu 1500 qdisc
> pfifo_fast state UNKNOWN qlen 3
>     link/ppp 
>     RX: bytes  packets  errors  dropped overrun mcast   
>     21120910   21103    0       0       0       0      
>     RX errors: length  crc     frame   fifo    missed
>                0        0       0       0       0      
>     TX: bytes  packets  errors  dropped carrier collsns 
>     1310652    13736    0       0       0       0      
>     TX errors: aborted fifo    window  heartbeat
>                0        0       0       0      
> 


Hmm, by the way, I see the default device queue length of ppp is 3

You might have packet drops at the ppp0 device itself

ip -s -s link show dev ppp0 ; tc -s -d qdisc show dev ppp0

You could try to increase ppp0 queue length or install a classifier with
128 packet limit.

ifconfig ppp0 txqueuelen 32

or :

tc qdisc add dev ppp0 root sfq



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