netdev - Re: twice past the taps, thence out to net?

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Message-ID: <1324064689.2621.24.camel@edumazet-laptop>
Date:	Fri, 16 Dec 2011 20:44:49 +0100
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Rick Jones <rick.jones2@...com>
Cc:	Stephen Hemminger <shemminger@...tta.com>,
	Vijay Subramanian <subramanian.vijay@...il.com>,
	tcpdump-workers@...ts.tcpdump.org, netdev@...r.kernel.org,
	Matthew Vick <matthew.vick@...el.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Subject: Re: twice past the taps, thence out to net?

Le vendredi 16 décembre 2011 à 11:35 -0800, Rick Jones a écrit :

> I would *love* to.  All my accessible igb-driven hardware is in an 
> environment locked to the kernels already there :(  Not that it makes it 
> more possible for me to do it, but I suspect it does not require 30 
> receivers to reproduce the dups with netperf TCP_STREAM.  Particularly 
> if the tx queue len is at 256 it may only take 6 or 8. In fact let me 
> try that now...
> 
> Yep, with just 8 destinations/concurrent TCP_STREAM tests from the one 
> system one can still see the duplicates in the packet trace taken on the 
> sender.
> 
> Perhaps we can trouble the Intel guys to try to reproduce what I've seen?
> 

I do have an igb card somewhere (in fact two dual ports), I'll do the
test myself !

Thanks


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