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From: Eric Dumazet <eric.dumazet@gmail.com>
To: Rick Jones <rick.jones2@hp.com>
Cc: Stephen Hemminger <shemminger@vyatta.com>,
	Vijay Subramanian <subramanian.vijay@gmail.com>,
	tcpdump-workers@lists.tcpdump.org, netdev@vger.kernel.org,
	Matthew Vick <matthew.vick@intel.com>,
	Jeff Kirsher <jeffrey.t.kirsher@intel.com>
Subject: Re: twice past the taps, thence out to net?
Date: Fri, 16 Dec 2011 20:44:49 +0100	[thread overview]
Message-ID: <1324064689.2621.24.camel@edumazet-laptop> (raw)
In-Reply-To: <4EEB9D64.5080901@hp.com>

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

  reply	other threads:[~2011-12-16 19:44 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-12-14 19:27 twice past the taps, thence out to net? Rick Jones
2011-12-15  0:58 ` Benjamin Poirier
2011-12-15  2:12 ` Vijay Subramanian
2011-12-15 17:43   ` Eric Dumazet
2011-12-15 18:32     ` Rick Jones
2011-12-15 18:44       ` Stephen Hemminger
2011-12-15 19:00         ` Eric Dumazet
2011-12-15 22:22           ` Rick Jones
2011-12-16  4:27             ` Eric Dumazet
2011-12-16 18:28               ` Jesse Brandeburg
2011-12-16 19:34                 ` Eric Dumazet
2011-12-16 19:35               ` Rick Jones
2011-12-16 19:44                 ` Eric Dumazet [this message]
2011-12-20 21:21                   ` Wyborny, Carolyn
2011-12-15 18:54       ` Eric Dumazet

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