netdev - Re: r8169 performance?

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Message-ID: <1323035402.2762.189.camel@edumazet-laptop>
Date:	Sun, 04 Dec 2011 22:50:02 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Chris Adams <cmadams@...aay.net>
Cc:	netdev@...r.kernel.org
Subject: Re: r8169 performance?

Le dimanche 04 décembre 2011 à 15:10 -0600, Chris Adams a écrit :
> I have a system with an on-board RealTek gigabit network interface that
> is giving me poor performance.  I'm using a simple test, running "nc -l"
> on one system and "dd if=/dev/zero | nc" on another.  I see about 280
> Mbps transmit and 511 Mbps receive.

Do you mean that if this problematic NIC is the receiver, it receives
280Mbps, and if it is the sender, speed is 511 Mbps ?

Could you check counters ?  

netstat -s
ethtool -S ethX
cat /proc/net/softnet_stat

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