View Full Version : Tcpoptimizer

02-27-2003, 08:05 PM
Well, I wanted to know what all the fuss is about and used the TCPOptimizer...
I have an ADSL 768/128 connection and couldn't believe my eyes after some extensive testing:
Before: 707 (average, did about 10 tests)
After: 980 (again, this is an average from 10 tests). The filesize of the testfile was 1,5 MB, but still I find it difficult to believe that this can be right?
Any good explanation for this?

BTW - should this have been posted in softwareworld? Or even hardwareworld?

02-27-2003, 10:29 PM
TCPOptimiser works well on some connections, less well on others...

looks like you got lucky.

Explanation: Microsoft's default TCP settings are crud.

02-27-2003, 10:43 PM
Yeah, looks like it - will try to see if that can be a constant speed with larger files.
The thing is, I'm running Linux as well, and a friend of mine optimized it until I got a max 800 k, but 980...
Well, maybe I shouldn't think about it too much and just enjoy it.

02-27-2003, 11:29 PM
I have used several optimizers so far and none of them have changed my speed a bit! I'm on a 256k\128k DSL line and I get about 220k.

02-28-2003, 12:40 AM
All of these programs work well but you can mod it further in the registry.

02-28-2003, 06:18 AM
Yes, they are analyzing your settings on the site I downloaded the program from and give more suggestions for values you could try.

These are my current settings:

TCP options string = 020405a00103030201010402

MTU = 1480
MTU is optimized for Windows XP PPoE DSL broadband. If not, consider raising MTU to 1500 for optimal throughput.

MSS = 1440
Maximum useful data in each packet = 1440, which equals MSS.
MSS is optimized for Windows XP PPPoE DSL broadband. If not, consider raising MTU to 1500 for maximum throughput.

Default Receive Window (RWIN) = 255552
RWIN Scaling (RFC1323) = 2 bits
Unscaled Receive Window = 63888
For optimum performance, consider changing RWIN to a multiple of MSS.
Other values for RWIN that might work well with your current MTU/MSS:
506880 (MSS x 44 * scale factor of 8)
253440 (MSS x 44 * scale factor of 4)
126720 (MSS x 44 * scale factor of 2)
63360 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 10222.08 kbps (1277.76 KBytes/s) @ 200ms
Your RcvWindow limits you to: 4088.832 kbps (511.104 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 57 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

I might fiddle around a bit more, but as I said, I'm still pretty stunned about the initial results.
If anyone hasn't tried it yet, this is the url:

Speedguide (http://www.speedguide.net)