Is there an easier way to calculate my RWIN? Tweaking FAQ

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Is there an easier way to calculate my RWIN?

Well, maybe.

It involves clicking the "more details" portion of the tweak test result, and then looking down at the bottom right hand side for an entry saying "RTTavg."

Take this value and use it for latency in the formula: (latency) x 1.5 x (advertised speed in kbps) divide by 8

Example: MSS is 1460, RTTavg is 125ms and advertised download speed is 1500kbps.
125 x 1.5 = 187.5
187.5 x 1500kbps = 281250
281250 divide by 8 = 35156
35156 divide by 1460 (MSS) = 24.07
Round up to next even number = 26
26 x 1460 = 37960 (optimal RWIN)

got feedback?

what the heck is MSS?

2008-07-14 19:52:39

MSS = MTU - 40 bytes (IP and TCP header overhead) http://www.internetweekly.org/llarrow/mtumss.html

2008-08-15 16:50:11 (mnottage )

Is there an easier way to calculate my RWIN? (#6181): kbps = Kilo bytes per second? or Kilo bits per second?

2009-05-10 15:44:20

ISPs sell in bits.. kilobits or megabits.

2009-05-10 20:49:43 (redxii )

Should I use the value from "RTTavg (last)" at the "bottom right" or "RTTavg" located higher?

2009-09-26 11:06:12 (robo606 )

robo606: Use the value from "RTTavg (last)" at the "bottom right" in the "more details" portion of the tweak test result.

2013-03-14 21:00:12 (dwlamborg )

by garp123 edited by JMGullett
last modified: 2007-02-27 09:41:11

All FAQs » Tweaking FAQ » 5. RWIN

Is there an easier way to calculate my RWIN?