JawZ
03-17-01, 07:15 AM
TCP options string = 020405b401010402
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which is equal to MSS.
Default Receive Window (RWIN) = 65535
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 65535
Note: Under Windows 9x, if you have RWIN set to any other value, and the Analyzer reports 65535 you might need to install the MS Vtcp386 fix.
For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product:
Your RcvWindow limits you to: 2621.4 kbps (327.675 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1048.56 kbps (131.07 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = OFF
Time to live left = 51 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349)= 00000000
26144 connections tested since 03-10-2001, 14:30 ET
I am using System Mechanic to perform my tweaks without the Vtcp.386 update so here are my settings:
Start Test: 3/17/01 8:12:07 AM
Test Type: Download 1 megabyte
Operating System: Windows 98
-------------Settings Used------------
Maximum Transfer Unit: 1500
Tcp Receive Window: 372300
Time To Live: 64
Black Hole Detection: False
Auto-Detect Maximum Transfer Unit: False
Maximum number of simultaneous HTTP 1.0 Connections: 10
Maximum number of simultaneous HTTP 1.1 Connections: 8
Tcp Options: 3 - Window Scaling and Timestamp Options
Fast Retransmission and Recovery support value: 3
Support for Selective Acknowledgements: True
---------------------------------------------
Data Transfer Start: 3/17/01 8:12:11 AM
Data Transfer Complete: 3/17/01 8:12:14 AM
--->Total Data Received: 1024.06 kilobytes
--->Time to Complete Transfer: 00:00:03:618
--->Average Speed: 274.06 kilobytes per second
--->Peak Speed: 390.10 kilobytes per second
Am I doing anything wrong so far? :)
MTU = 1500
MTU is fully optimized for broadband.
MSS = 1460
Maximum useful data in each packet = 1460, which is equal to MSS.
Default Receive Window (RWIN) = 65535
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 65535
Note: Under Windows 9x, if you have RWIN set to any other value, and the Analyzer reports 65535 you might need to install the MS Vtcp386 fix.
For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
513920 (MSS x 44 * scale factor of 8)
256960 (MSS x 44 * scale factor of 4)
128480 (MSS x 44 * scale factor of 2)
64240 (MSS x 44)
bandwidth * delay product:
Your RcvWindow limits you to: 2621.4 kbps (327.675 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1048.56 kbps (131.07 KBytes/s) @ 500ms
MTU Discovery (RFC1191) = OFF
Time to live left = 51 hops
TTL value is ok.
Timestamps (RFC1323) = OFF
Selective Acknowledgements (RFC2018) = ON
IP type of service field (RFC1349)= 00000000
26144 connections tested since 03-10-2001, 14:30 ET
I am using System Mechanic to perform my tweaks without the Vtcp.386 update so here are my settings:
Start Test: 3/17/01 8:12:07 AM
Test Type: Download 1 megabyte
Operating System: Windows 98
-------------Settings Used------------
Maximum Transfer Unit: 1500
Tcp Receive Window: 372300
Time To Live: 64
Black Hole Detection: False
Auto-Detect Maximum Transfer Unit: False
Maximum number of simultaneous HTTP 1.0 Connections: 10
Maximum number of simultaneous HTTP 1.1 Connections: 8
Tcp Options: 3 - Window Scaling and Timestamp Options
Fast Retransmission and Recovery support value: 3
Support for Selective Acknowledgements: True
---------------------------------------------
Data Transfer Start: 3/17/01 8:12:11 AM
Data Transfer Complete: 3/17/01 8:12:14 AM
--->Total Data Received: 1024.06 kilobytes
--->Time to Complete Transfer: 00:00:03:618
--->Average Speed: 274.06 kilobytes per second
--->Peak Speed: 390.10 kilobytes per second
Am I doing anything wrong so far? :)