Is this normal for testing? [Archive] - SpeedGuide.net Broadband Community

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Vesuvius
02-05-02, 08:13 PM
I got a few different RWINS from Lobo and proceeded to test them this morning (yes speakeasy came back up for me :p). What I noticed is that the numbers don't really vary all that much, when averaged out, 50kbps tops.

I tested 6 different RWINs (51100, 64240, 256960, 513920, 522680 and 524176). I ran 3 speed tests at speakeasy off the Chicago server and averaged them out. I assumed that they would slowly improve till I reached my optimum RWIN then start going down when I passed it up. In reality they jumped all over the board on me. One test would show 1400 down then the same RWIN would re test at 800 down (yes I cleared the cache and crap between each test). Last night at around 5:00 PM EST 51100 tested the fastest, then this morning at around 4:30 AM I got 256960 as my fastest one. Needless to say, I'm confused here.:confused:

Is there a second type of test I could use to get a better feel for what's happening here or is this just the "nature of the beast". I can see minor improvements here and there but can't seem to nail down what my best RWIN is due to the tests varying a lot. Any advice on a second test I could do for each RWIN to nail it down?

mnosteele52
02-05-02, 08:20 PM
The best test is just use different RWIN's for a while, different times of the day when internet traffic varies, and see what works for you. Where you will see the most difference is downloading large files 10mb or larger, with a larger RWIN you should see a great improvement.:D ;) :p

HalfLifer
02-05-02, 08:40 PM
Speed of connection and latency is what deciphers the RWIN, not lobos idea of CPU and ram (rofl).

Lobo
02-05-02, 10:06 PM
His idea, not mine:) Try Dallas test

Mike_W
02-07-02, 11:53 AM
I did the same thing...tested many many RWINS. In XP, this is my current Optimizer results. Any suggestions?
__________________________________________
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) = 601520
RWIN Scaling (RFC1323) = 4 bits
Unscaled Receive Window = 37595
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: 24060.8 kbps (3007.6 KBytes/s) @ 200ms
Your RcvWindow limits you to: 9624.32 kbps (1203.04 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 46 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000

Mike_W
02-07-02, 11:56 AM
Oh, while I'm here. Here is the Speakeasy speed test results (WinXP)
____________________________________________

Test running.....Upload got ok 1 bytes uploaded
Uploaded 1bytes in 60ms
Upload got ok 1 bytes uploaded
Uploaded 1bytes in 51ms
Upload got ok 1 bytes uploaded
Uploaded 1bytes in 70ms
Upload got ok 50000 bytes uploaded
Uploaded 50000bytes in 3074ms
Upload got ok 100000 bytes uploaded
Uploaded 100000bytes in 6499ms

** Speed 1230(down)/124(up) kbps **
(At least 24 times faster than a 56k modem)
Finish.

Lobo
02-07-02, 12:02 PM
Thats about it for Comcast, 50 times faster than 28.8 modem=25 times faster than 56K:)