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

["Wyborny, Carolyn" <carolyn.wyborny () intel com>]

> -----Original Message-----
> From: netdev-owner () vger kernel org [mailto:netdev-owner () vger 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 () lists tcpdump org; netdev () vger 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


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