50 Mbit Cable LAN (measuring) - Windows7 64 - fast Notebook i7 Nvidia
also use on lower speed WLAN - and with surf-stick
After using the newest Speedguide Optimizer 3.0.8 with settings optimal got the following hint - in red colour:
"RWIN is not fully optimized. 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."see below in yello
TCP options string = 020405b40103030201010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which equals MSS.
Default TCP Receive Window (RWIN) = 65700
RWIN Scaling (RFC1323) = 2 bits (scale factor: 2^2=4)
Unscaled TCP Receive Window = 16425
In Windows 7, unless "TCP/IP Auto-Tuning" is disabled, only the Current TCP Window is displayed. Use the latest TCP Optimizer for tweaking.
RWIN is not fully optimized. 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:
64240 (up to 2 Mbit lines, depending on latency. MSS * 44)
128480 (1-5 Mbit lines, depending on latency. MSS * 44 * 2)
256960 (2-14 Mbit lines, depending on latency. MSS * 44 * 2^2)
513920 (8-30 Mbit lines, depending on latency. MSS * 44 * 2^3)
1027840 (25-60 Mbit lines depending on latency. MSS * 44 * 2^4)
bandwidth * delay product (Note this is not a speed test):
Your TCP Window limits you to: 2628 kbps (329 KBytes/s) @ 200ms
Your TCP Window limits you to: 1051 kbps (131 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = ON
Time to live left = 54 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349) = 00000000 (0)
------------
« SpeedGuide.net TCP Analyzer Results »
Tested on: 2012.05.04 19:00
IP address: 80.219.xxx.xx
Client OS/browser: Windows 7 (Internet Explorer 9.0)
TCP options string: 020405b40103030201010402
MSS: 1460
MTU: 1500
TCP Window: 65700 (multiple of MSS)
RWIN Scaling: 2 bits (2^2=4)
Unscaled RWIN : 16425
Recommended RWINs: 64240, 128480, 256960, 513920, 1027840
BDP limit (200ms): 2628kbps (329KBytes/s)
BDP limit (500ms): 1051kbps (131KBytes/s)
MTU Discovery: ON
TTL: 54
Timestamps: OFF
SACKs: ON
IP ToS: 00000000 (0)
-----------------------
Out of SG TCP Optimizer Windows7 64 - CURRENT settings: AFTER using Optimizer (several times) to Optimal:
TCP Window Auto-Tuning... normal
Congestion... ctcp
TCP ... enabled
Receive slide scaling... enabled
DCA ... enabled
TCPA ... enabled
MTU ... 1500
TTL ... 64
ECN ... disabled
Windows scaling heuristics.. disabled
Checksum ... enabled:0
TCP 1323 Options... Windows scaling



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