I don't get it

[Mohan-san]

I changed my Rwin to a random number, and not being a multiple of MSS (1460) my speeds have gone up. :confused:

Test running..........
** Speed 470(down)/231(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

Test running..........
** Speed 474(down)/230(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

Test running..........
** Speed 476(down)/231(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

Test running..........
** Speed 477(down)/247(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

They used to be much lower, infact a bit like this

Test running..........
** Speed 420(down)/230(up) kbps **
(At least _ times faster than a 56k modem)
Finish.

[mnosteele52]

Just because it's not a mulptiple doesn't mean it won't work, but if it is a multiple is reduces the chance for lost packets thereby slowing you down. Try taking the number you used and rasie it ir lower to make it a multiple.

From the White Papers:

.............TCP adjusts to even increments of the maximum segment size (MSS) negotiated during connection setup. Matching the receive window to even increments of the MSS increases the percentage of full-sized TCP segments used during bulk data transmission.



:D ;)

[Mohan-san]

Welll its 27670 right now. So I'll change it to 27740. Let's see...

[Mohan-san]

Right..

Test running..........
** Speed 474(down)/231(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

Test running..........
** Speed 472(down)/210(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

Test running..........
** Speed 477(down)/213(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

Test running..........
** Speed 477(down)/242(up) kbps **
(At least 9 times faster than a 56k modem)
Finish.

See any difference?

[mnosteele52]

I think your missing the point. It increases the percentage of receiving more full sized data packets.

TcpWindowSize

Description: This parameter determines the maximum TCP receive window size offered by the system. The receive window specifies the number of bytes a sender may transmit without receiving an acknowledgment. In general, larger receive windows will improve performance over high (delay * bandwidth ) networks. For highest efficiency, the receive window should be an even multiple of the TCP Maximum Segment Size (MSS).

:)

[Mohan-san]

Ahh I see. :)

[vicoman]

Some tweaking programs and even speed patches from other sites, do not always use a multiple of MSS. What I would like to know is what is the formula they use to come up with these numbers or are they just pulling them out of the air, which I doubt. Does anyone have a link to a informative page on this subject? I haven't been able to find anything.

[jeff8874]

I have tested almost evey possible RWIN and I find that the best that works for me is 372296, which is not a multiple obviously. Xsetup changed it to that and I never felt the need to change it back. It works great.