tcp optimizer

[carl]

hi, i've been fooling around with the tcp receive window values. i have been using 64240. i've tried 513920,256960,128480 also. i did a download test. i tried downloading a 50.3 mg file with all of the above values. i get around the same download speed with all. it's 15.4 - 15.8 mgs in 1 1/2 mins. i delete temp files cookies and history everytime i test and reboot. that's the only thing i change in optimizer is the receive window. is that all i have to change to see which is fastest. and is that a good speed.

running p4 1.4 intel
256 rambus 800 mhz ram
asus p4t motherboard 400mhz front side bus
cable modem
windows me
thanks carl

[MadDoctor]

Hi. Post the results of the SG Analyzer and lets see what you've got. Maybe a tweak or two will help you out (edit out your IP number).

[Lobo]

Try Tcp Recieve Windows of 595680, 601520, 607360, 642400

[carl]

TCP options string = 020405b40103030001010402

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) = 64240
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 64240
RWIN is 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)

bandwidth * delay product:
Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




9556 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030001010402

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) = 64240
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 64240
RWIN is 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)

bandwidth * delay product:
Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




9556 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030001010402

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) = 64240
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 64240
RWIN is 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)

bandwidth * delay product:
Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




9556 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030001010402

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) = 64240
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 64240
RWIN is 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)

bandwidth * delay product:
Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




9556 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030001010402

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) = 64240
RWIN Scaling (RFC1323) = 0 bits
Unscaled Receive Window = 64240
RWIN is 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)

bandwidth * delay product:
Your RcvWindow limits you to: 2569.6 kbps (321.2 KBytes/s) @ 200ms
Your RcvWindow limits you to: 1027.84 kbps (128.48 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




9556 connections tested since 03.10.2001.
Analyzer version: Beta 0.99

[MadDoctor]

Looks like a standard setup. One of the boys might be able to tweak that setting for you (I don't have the necessary IQ to help. I'm working on it though).

[Lobo]

Try numbers I gave you above, you do not need to delete cookies:

Do your speed tests here after you turn off all running programs http://www.speakeasy.net/main.php?page=sup_pops , select site nearest to you, turn everything off thats running, Check Taskbar, 1 browser, clear cache,



Even though it is not the nearest the Dallas test is pretty quick


BEFORE SPEEDTEST
1.) Make sure defrag has been run, defragmented files slow you down.
2. At top of IE, click on Tools, internet options, click on delete files and click on offline files (It's safe), click on clear history, yes
3.) Go to Start button, programs, accessories, system tools, disk cleanup, Click OK (Safe)
4.) Run scandisk (Short version)
5.) Scandisk on XP?
Click on My Computer, select Drive that XP is on, RIGHT click on BLANK place, select properties, then tools at top tab, click check now, check box automattically fix system errors, click start,
then test. Turn all running programs off. Reboot computer so you have all your RAM

[carl]

sg it's the one you told me to put in before lobo.

[Lobo]

Yea I saw it late, so sorry

[Lobo]

Don't forget to turn scaling back on, Tcp1323Opts, Check windows scaling

[Lobo]

Carl, whenever RWIN or Tcp Recieve Window is above 65535 you must have Windows scaling checked

[carl]

you think i should try those settings you gave me. also this is what i have dont modify network adapters, and modify all network adapters both unchecked. mtu disc- yes, black hole detect - no, selective acks yes, max duplicate acks - 3, tcp 1323 options checked.

[Lobo]

Max duplicate acks=2 and yes try numbers

[carl]

ok i'll change max duplicate acks =2 and try those numbers. i'll be back with results. and i'll make sure scaling is checked when i change. hold on brb

[Lobo]

Carl, it has your name at top, which means you had 2 browsers open, no, no do it again

[carl]

ok here it isfrom speakeasy.net
dallas 1481 down 224 up, boston 1406 down 209 up 595680
dallas 1390 down 210 up, boston 1422 down 231 up 601520
dallas 1374 down 219 up, boston 1447 down 238 up 607360
dallas 1322 down 225 up, boston 1463 down 178 up 642400

i change the max duplicate acks to 2 each time plus deleted files.
no good, what do you think. i'm from ma.

[Lobo]

And the winner is:

wait, wait:

dallas 1481 down 224 up, boston 1406 down 209 up 595680

[carl]

so lobo you think i should put in 595680 with max dup acks =2
does that seem good, avg, not so good.

[Lobo]

Is that faster than before are your CAPS 1500/128

[carl]

let me try the settings i had before. in the mean time tell me what caps 1500 and 128 mean brb

[Lobo]

When CONcast & AT&T bought @Home they lowered bandwidth to 1.5 down and 128kbs up, 1.5 is 1500, if you don't know CAPS, pack pic-nic lunch and call ISP

[carl]

dallas 1300- 211 boston 1397 - 234
64240
this is what i have nowTCP options string = 020405b40103030401010402

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) = 595680
RWIN Scaling (RFC1323) = 4 bits
Unscaled Receive Window = 37230
RWIN is 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: 23827.2 kbps (2978.4 KBytes/s) @ 200ms
Your RcvWindow limits you to: 9530.88 kbps (1191.36 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




10748 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030401010402

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) = 595680
RWIN Scaling (RFC1323) = 4 bits
Unscaled Receive Window = 37230
RWIN is 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: 23827.2 kbps (2978.4 KBytes/s) @ 200ms
Your RcvWindow limits you to: 9530.88 kbps (1191.36 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




10748 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030401010402

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) = 595680
RWIN Scaling (RFC1323) = 4 bits
Unscaled Receive Window = 37230
RWIN is 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: 23827.2 kbps (2978.4 KBytes/s) @ 200ms
Your RcvWindow limits you to: 9530.88 kbps (1191.36 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




10748 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030401010402

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) = 595680
RWIN Scaling (RFC1323) = 4 bits
Unscaled Receive Window = 37230
RWIN is 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: 23827.2 kbps (2978.4 KBytes/s) @ 200ms
Your RcvWindow limits you to: 9530.88 kbps (1191.36 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




10748 connections tested since 03.10.2001.
Analyzer version: Beta 0.99
TCP options string = 020405b40103030401010402

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) = 595680
RWIN Scaling (RFC1323) = 4 bits
Unscaled Receive Window = 37230
RWIN is 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: 23827.2 kbps (2978.4 KBytes/s) @ 200ms
Your RcvWindow limits you to: 9530.88 kbps (1191.36 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 47 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000




10748 connections tested since 03.10.2001.
Analyzer version: Beta 0.99