10gig coast to coast

Tue Jun 18 15:53:48 UTC 2013

Dear All

We Deal with TCP window size all day every day across the southern cross from LA to Australia which adds around 160ms...  I've given up looking for a solution to get around physical physics of sending TCP traffic a long distance at a high speed....

UDP traffic however comes in very fast....

Kindest Regards

James Braunegg
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-----Original Message-----
From: Phil Fagan [mailto:philfagan at gmail.com] 
Sent: Wednesday, June 19, 2013 12:16 AM
To: Jakob Heitz
Cc: <nanog at nanog.org>
Subject: Re: 10gig coast to coast

Sorry; yes Sawtooth is the more accurate term. I see this on a daily occurance with large data-set transfers; generally if the data-set is large multiples of the initial window. I've never tested medium latency(
<100ms) with small enough payloads where it may pay-off threading out many thousands of sessions. However, medium latency with large files (50M-10G) threads well in the sub 200 range and does a pretty good job at filling several Gig links. None of this is scientific; just my observations from the wild.....infulenced by end to end tunings per environment.

On Tue, Jun 18, 2013 at 7:45 AM, Jakob Heitz <jakob.heitz at ericsson.com>wrote:

> Thanks Fred. Sawtooth is more familiar.
> How much of that do you actually see in practice?
>
> Cheers,
> Jakob.
>
>
> On Jun 18, 2013, at 6:27 AM, "Fred Reimer" <freimer at freimer.org> wrote:
>
> > It is also called a "sawtooth" or similar terms.  Just google "tcp 
> > sawtooth" and you will see many references, and images that depict 
> > the traffic pattern.
> >
> > HTH,
> >
> > Fred Reimer | Secure Network Solutions Architect Presidio | 
> > www.presidio.com <http://www.presidio.com/>
> > 3250 W. Commercial Blvd Suite 360, Oakland Park, FL 33309
> > D: 954.703.1490 | C: 954.298.1697 | F: 407.284.6681 |
> freimer at presidio.com
> > CCIE 23812, CISSP 107125, HP MASE, TPCSE 2265
> >
> >
> >
> >
> > On 6/18/13 9:20 AM, "Jakob Heitz" <jakob.heitz at ericsson.com> wrote:
> >
> >>> Date: Mon, 17 Jun 2013 22:04:52 -0600
> >>> From: Phil Fagan <philfagan at gmail.com> ... you could always thread 
> >>> the crap out of whatever it is your transactioning across the link 
> >>> to make up for TCP's jackknifes...
> >>
> >> What is a TCP jackknife?
> >>
> >> Cheers.
> >> Jakob.
> >>
> >
>
>

--
Phil Fagan
Denver, CO
970-480-7618