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

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Date:	Tue, 20 Dec 2011 21:21:58 +0000
From:	"Wyborny, Carolyn" <carolyn.wyborny@...el.com>
To:	Eric Dumazet <eric.dumazet@...il.com>,
	Rick Jones <rick.jones2@...com>
CC:	Stephen Hemminger <shemminger@...tta.com>,
	Vijay Subramanian <subramanian.vijay@...il.com>,
	"tcpdump-workers@...ts.tcpdump.org" 
	<tcpdump-workers@...ts.tcpdump.org>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>,
	"Vick, Matthew" <matthew.vick@...el.com>,
	"Kirsher, Jeffrey T" <jeffrey.t.kirsher@...el.com>
Subject: RE: twice past the taps, thence out to net?



>-----Original Message-----
>From: netdev-owner@...r.kernel.org [mailto:netdev-owner@...r.kernel.org]
>On Behalf Of Eric Dumazet
>Sent: Friday, December 16, 2011 11:45 AM
>To: Rick Jones
>Cc: Stephen Hemminger; Vijay Subramanian; tcpdump-
>workers@...ts.tcpdump.org; netdev@...r.kernel.org; Vick, Matthew;
>Kirsher, Jeffrey T
>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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Let me know if I can do anything to assist.  Sorry to have overlooked this thread for a bit.

Thanks,

Carolyn

Carolyn Wyborny
Linux Development
LAN Access Division
Intel Corporation