[163799] in North American Network Operators' Group
RE: 10gig coast to coast
daemon@ATHENA.MIT.EDU (James Braunegg)
Tue Jun 18 20:25:18 2013
From: James Braunegg <james.braunegg@micron21.com>
To: "Valdis.Kletnieks@vt.edu" <Valdis.Kletnieks@vt.edu>
Date: Wed, 19 Jun 2013 00:24:15 +0000
In-Reply-To: <6185.1371575929@turing-police.cc.vt.edu>
Cc: Jakob Heitz <jakob.heitz@ericsson.com>,
"<nanog@nanog.org>" <nanog@nanog.org>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
Dear Valdis
Thanks for your comments, whilst I know you can optimize servers for TCP wi=
ndowing I was more talking about network backhaul where you don't have cont=
rol over the server sending the traffic.
ie backhauling IP transit over the southern cross cable system
Kindest Regards
James Braunegg
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-----Original Message-----
From: Valdis.Kletnieks@vt.edu [mailto:Valdis.Kletnieks@vt.edu]=20
Sent: Wednesday, June 19, 2013 3:19 AM
To: James Braunegg
Cc: Phil Fagan; Jakob Heitz; <nanog@nanog.org>
Subject: Re: 10gig coast to coast
On Tue, 18 Jun 2013 15:53:48 -0000, James Braunegg said:
> We Deal with TCP window size all day every day across the southern=20
> cross from LA to Australia which adds around 160ms... I've given up=20
> looking for a solution to get around physical physics of sending TCP=20
> traffic a long distance at a high speed....
http://www.extremetech.com/extreme/141651-caltech-and-uvic-set-339gbps-inte=
rnet-speed-record
It's apparently doable. ;)
A quick cheat sheet for the low-hanging fruit:
http://www.psc.edu/index.php/networking/641-tcp-tune
Though to get to *really* high througput, you may have to play some games w=
ith TCP slow-start so it's not quite as slow (otherwise for long hauls it c=
an take literally hours to open the window after a packet burp at 10G or hi=
gher)
Also, you may want to look at CODEL or related queueing disciplines to mini=
mize the amount of trouble that bufferbloat can cause you at high speeds.
