netdev - Re: What causes these TCP packet getting lost in linux kernel

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Message-ID: <1397331172.4222.8.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Sat, 12 Apr 2014 12:32:52 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Sharat Masetty <sharat04@...il.com>
Cc:	chptx y <chptxy@...il.com>,
	Linux Netdev List <netdev@...r.kernel.org>
Subject: Re: What causes these TCP packet getting lost in linux kernel

On Sat, 2014-04-12 at 12:35 -0600, Sharat Masetty wrote:
> Check /proc/net/netstat and /proc/net/snmp
> 
> In netstat look for
> 
> LINUX_MIB_TCPOFODROP and LINUX_MIB_BACKLOGDROP

The packet is not out of order, according to tcpdump.

Note that the receiver reacts to incoming packet, sending a DUPACK, so
its not a backlogdrop.

tcpdump trace is really incomplete, I asked tcpdump -vv but got nothing
from chptx, assuming this is a real name.

packet might be rejected because of a zero receiver window, who knows.

I might search in my basement this crystal ball I might have.

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