netdev - Re: linux-3.0.18+r8169+ipv4/tcp forwarding = tso/gso weirdness and performance degration

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Date:	Wed, 14 Mar 2012 13:12:45 -0700
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Timo Teras <timo.teras@....fi>
Cc:	Ben Hutchings <bhutchings@...arflare.com>, netdev@...r.kernel.org,
	Francois Romieu <romieu@...zoreil.com>
Subject: Re: linux-3.0.18+r8169+ipv4/tcp forwarding = tso/gso weirdness and
 performance degration

On Wed, 2012-03-14 at 21:51 +0200, Timo Teras wrote:

> Very good point. I thought gso also enabled gro, but seems that my
> ethtool was old.
> 
> And GRO was enabled along with some other stuff. Turning GRO off made
> my tcp performance immediately a lot better; jumped from 2MB/s to 8MB/s
> or so (not ideal yet, though; but the remainder of the difference could
> be related to other issue).
> 
> So something is definitely broke in 3.0.x with GRO enabled, but GSO off.

"ifconfig eth2 ; netstat -s" can really help, I suspect tcp stack drops



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