Correct RWIN setting for my connection

[yours truly]

hi guys,

ive been lucky to an extent, that ive got 24.5mb DSL broadband.

however im not sure what RWIN setting to use. Im on XP

if i go to dslreports.com and run the tweaktest it says it should between 230680 to 614660

but when i use TCPOtimpizer and move the slider to the right its sets at 1027840.

theres a big difference between the two, which one should i use?

many thanks

 

[spidey07]

The one that gives you the best performance. There is no right answer.

If you have any packet loss, then lower it.

 

[JackMDS]

You try both, measure the download and settle on the one that works best.

 

[yours truly]

thanks for your replies guys, was just a little confused, but ok now, sort of

 

[spidey07]

Originally posted by: hopeless74
thanks for your replies guys, was just a little confused, but ok now, sort of

Work in halves to see what works best. Your RWIN changes depending on loss and latency, you are just setting an initial value. TCP will work out the rest. I can't recall, but maybe this is a MAX RWIN setting as well.

Start at 500K, then 1000K, compare. See if you need to go up or down. Keep in mind that network conditions can yield different results, at different times. So there really is no "right" setting.

 

[yours truly]

thanks spidey07, i'll start tinkering, see what happens..

 

[spidey07]

Originally posted by: hopeless74
thanks spidey07, i'll start tinkering, see what happens..

If you really are interested and want to learn look up the how TCP operates. It's nothing more than an algorithm based on math.

The entire goal of TCP was to adapt to conditions and it did a really good job. But high bandwidth/high latency networks weren't part of the math as they didn't exist when it was developed.

In essence, make your receive window as large as you can without impacting overall throughput due to packet loss.

 

[yours truly]

ok will do, i'll start at 10million and go down fron there then, lol

cheers :beer:

 

[spidey07]

Originally posted by: hopeless74
ok will do, i'll start at 10million and go down fron there then, lol

cheers :beer:

Me thinks you will be going down. More is not necessarily better with this.

On a LAN where packet loss is extremely rare, maybe.

 

[yours truly]

i can copy/paste my stats from my speedtouch 780, maybe you could tell me if all is ok??

Link Information


Uptime: 0 days, 11:34:38

Modulation: G.992.5 Annex A

Bandwidth (Up/Down) [kbps/kbps]: 1,408 / 24,574

Data Transferred (Sent/Received) [MB/GB]: 499.07 / 3.66

Output Power (Up/Down) [dBm]: 12.0 / 18.5

Line Attenuation (Up/Down) [dB]: 6.0 / 14.5

SN Margin (Up/Down) [dB]: 4.5 / 4.0

Vendor ID (Local/Remote): TMMB / µ

Loss of Framing (Local/Remote): 0 / 0

Loss of Signal (Local/Remote): 0 / 0

Loss of Power (Local/Remote): 0 / 0

Loss of Link (Remote): 0

Error Seconds (Local/Remote): 935 / 0

FEC Errors (Up/Down): 0 / 0

CRC Errors (Up/Down): 51,003 / 954

HEC Errors (Up/Down): 12,753 / 814





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loads of errors, thats got to be bad!

oh btw spidey07, how do i check for packet loss?

 

[JackMDS]

That shows the Router's performance Not the Computer's TCP/IP Stack performance.

 

[yours truly]

ok thanks.

im having trouble finding if i have packet loss, is there somewhere in windows or free software where i can check

many thanks

(i think i can hear spidey07 mowing his lawn. hurry dude, before the feds get ya)