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Windows 7: RWIN tweaking

25 May 2009   #1
theCount

windows 7 Ultimate Professional 6.01.7100
 
 
RWIN tweaking

I would like to check and maybe tweak the RWIN registry value does anyone have any experience doing this on win7 rc (7100)?


My System SpecsSystem Spec
.
25 May 2009   #2
torrentg

7600.20510 x86
 
 

Vista and 7 both tune it dynamically. Hacks or changes on these OS are not recommended.

Read further here:

Tweaking for speed - dslreports.com
My System SpecsSystem Spec
25 May 2009   #3
theCount

windows 7 Ultimate Professional 6.01.7100
 
 

Quote   Quote: Originally Posted by torrentg View Post
Vista and 7 both tune it dynamically. Hacks or changes on these OS are not recommended.

Read further here:

Tweaking for speed - dslreports.com
I have done the test there and it states vista has no tweakable TCP settings

but that I should set the RWIN to between 151008 and 400752

Meanwhile over at SpeedGuide.net :: The Broadband Guide

I get this result... (the site also recognizes my OS as windows 7!)

Default TCP Receive Window (RWIN) = 66792
RWIN Scaling (RFC1323) = 2 bits (scale factor: 2^2=4)
Unscaled TCP Receive Window = 16698

RWIN is not fully optimized (even though it is a comparatively large number). The unscaled RWIN value is lower than it should be. Also, RWIN being close to and above 65535 does not justify the header overhead of enabling TCP 1323 Options. You might want to use one of the recommended RWIN values below.

RWIN is a multiple of MSS
Other RWIN values that might work well with your current MTU/MSS:
63888 (up to 2 Mbit lines, depending on latency. MSS * 44)
127776 (1-5 Mbit lines, depending on latency. MSS * 44 * 2)
255552 (2-14 Mbit lines, depending on latency. MSS * 44 * 2^2)
511104 (8-30 Mbit lines, depending on latency. MSS * 44 * 2^3)
1022208 (25-60 Mbit lines depending on latency. MSS * 44 * 2^4)

I have tweaked my win xp using DRTCP from dslreports.com
and my connection is much faster...
My System SpecsSystem Spec
.

25 May 2009   #4
theCount

windows 7 Ultimate Professional 6.01.7100
 
 
More results

just did a speed test at speedguide.net...

SpeedGuide.net Speed Test Results
12811 kbps down (~12.81 Mbps, 1564 KB/s)↓
962 kbps up (~0.96 Mbps, 117 KB/s)↑
10240 KB downloaded in 6.548 seconds
3072 KB uploaded in 26.168 seconds
Tested on: 2009.05.25 20:32 EDT
Tested from: street-spam.de
Latency: 132ms
Provider: dip.t-dialin.net
Location: Gau-Bischofsheim, DE

Speed @ 296% of the average for dip.t-dialin.net

my connection is advertised as DSL 16000 (whatever that means)
My System SpecsSystem Spec
02 Dec 2009   #5
Onecoolkat

Win 7
 
 

Not being able to adjust RWIN value is not an option for me. My ISP is wireless, and is the only option here for Hi-Speed. Without changing the RWIn I am stuck with a 10-15% Packet loss.As a game that is not acceptable. If I can not get it changed Win 7 Go in the trash.
My System SpecsSystem Spec
15 Jul 2014   #6
KEiGHT

Windows 7 Ultimate x64
 
 

Hi guys,

Is there a way to set scale factor of window scaling RFC 1323 to 2^6=64 ?
In Windows 7 x64
Thanks !
My System SpecsSystem Spec
21 Jul 2014   #7
KEiGHT

Windows 7 Ultimate x64
 
 

RWIN Scaling (RFC1323) = 6 bits (scale factor: 2^6=64)
My System SpecsSystem Spec
20 Mar 2015   #8
KEiGHT

Windows 7 Ultimate x64
 
 

Quote   Quote: Originally Posted by Onecoolkat View Post
Not being able to adjust RWIN value is not an option for me. My ISP is wireless, and is the only option here for Hi-Speed. Without changing the RWIn I am stuck with a 10-15% Packet loss.As a game that is not acceptable. If I can not get it changed Win 7 Go in the trash.

netsh int tcp set global autotuninglevel=restricted
netsh int tcp set heuristics wsh=disabled forcews=enabled
netsh int tcp set global congestionprovider=ctcp
My System SpecsSystem Spec
Reply

 RWIN tweaking




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