netdev - Re: TSO on veth device slows transmission to a crawl

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Date:	Wed, 08 Apr 2015 11:19:02 -0700
From:	Rick Jones <rick.jones2@...com>
To:	Jan Engelhardt <jengelh@...i.de>
CC:	Eric Dumazet <eric.dumazet@...il.com>,
	Linux Networking Developer Mailing List 
	<netdev@...r.kernel.org>
Subject: Re: TSO on veth device slows transmission to a crawl

On 04/08/2015 11:16 AM, Jan Engelhardt wrote:

> One more thing to be aware of is that iptraf counts all the
> headers, which netperf likely is not doing.
>
>   -m   1: iptraf  57 MBit/s, netperf   0.69*10^6
>   -m  10: iptraf  63 MBit/s, netperf   6.76*10^6
>   -m 100: iptraf 114 MBit/s, netperf  75.74*10^6
> <no -m>: iptraf~580 MBit/s, netperf 542.00*10^6

Indeed, netperf makes no attempt to count headers.  What it reports is 
strictly above the socket interface.

rick
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