TCP Optimization, Windows Registry, MTU, RWIN

Michael · Last edited by Michael on Tue Mar 08, 2005 9:28 pm; edited 1 time in total

Hello,

I just posted a story and link to a web site that offers information on tweaking the Windows Registry for optimum TCP performance. Much of this can be applied to our EVDO connections. In fact, there is a download that automatically applies the settings for you.

If anyone has previously done these settings, or has additional info, please post it here for all to see.

http://www.EVDOInfo.com/Tips/PC_5220/Windows_2000%10XP_TCP_Registry_Tweaks_2005030787/

Richard Carver · Guest

That's a good site, there's a tool called DrTCP available there which give you a graphical interface to manually adjust RWIN numbers.

I've been experimenting with it and this is what I got today with a 128480 setting.

You have to be careful if you exceed 65XXX to make sure you have windows scaling turned on. The V620 software automatically does that. I have set it as high as 513XXX but the 128480 setting seems best for my set up.

All these figures are without using Venturi.

Michael · Posted: Mon Mar 07, 2005 3:30 pm Post subject:

Interesting to know what the benchmarks were before you changed any settings.

Richard Carver · Guest

The major difference is between the 5220 and the V620. I never got over 500 or so with the 5220 and 800-900 seems to be about average for the V620. There hasn't been a 10% variation in any of the combos I've tried.

I think the 5220 would have been a lot faster for me had I known how to alter the RWIN when I had it. It was set at 17,500 and I never changed it. The SW for the V620 set the RWIN at 62480 out of the box and I'm convinced that the big difference.

Guest · Posted: Mon Mar 07, 2005 5:49 pm Post subject:

Thanks Michael & Richard,

This is GREAT information.

I have a PC 5220 card and will be traveling at the end of the week and do some tweaking and testing and report the results here.