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TN-Ken
EVDO Newbie
Joined: 18 Jan 2006
Posts: 9
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 Posted: Thu Feb 09, 2006 3:49 pm Post subject: TCP Receive Window Setting |
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I've been reading these forums with interest since I purchased a "supercharged" EVDO setup from Robert Kim. One of the things that works from him is the suggestion to set the TCP Receive Window WAY up to 232320.
I just tested this with the Stanford test site http://netspeed.stanford.edu/ and got much better results than with the lower setting suggested here of 65k
My results at 232320 were consistently in the 610-620 kb range and at the lower setting were in the 300-350 range.
This is with a Novatel 620 card in a KR1 router with no external antenna (testing - will add antenna tomorrow).
By the way - the KR1 is just absolutely the cat's meow! - I'm using it here at my home/office and have another wireless router in the other part of the house and all are using the EVDO card for access. No "disconnect" problems with the Novatel card - I'll switch to my Kyocera 650 tomorrow for more testing.
Thanks for all the good info. |
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Michael
Site Admin
Joined: 13 Jan 2005
Posts: 5308
Location: Cary, IL
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| Posted: Thu Feb 09, 2006 4:33 pm Post subject: |
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neophyte - no problem - we are a friendly bunch here and welcome newbies.
TN-Ken - thanks for posting your info and findings. We are all about sharing and helping, so hopefully your post will help others.
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EVDO :: EVDO News :: EVDO Antennas :: Buy Verizon :: Buy Sprint :: EVDO Amplifier |
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diabolos88
EVDO Newbie
Joined: 25 Oct 2005
Posts: 7
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| Posted: Mon Feb 13, 2006 10:50 pm Post subject: |
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| Im also newbie, but what I'd like to know is the difference between 232320 and 65k? what does it mean? |
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TN-Ken
EVDO Newbie
Joined: 18 Jan 2006
Posts: 9
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| Posted: Tue Feb 14, 2006 7:44 am Post subject: TCP Receive Window Setting |
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The numbers that we're talking about are the respective values for the TCP Receive Window setting. Think of it as a funnel - like you'd use to fill a gas tank. This value is the size of the smallest part of the funnel. If you're only pouring a little bit of gas then you don't need a very large funnel but if you are able to pour a large amount then you need a bigger one.
The value of 232320 allows more data to flow than a setting of 65536 (65k).
My observations are that in order to fully utilize the bandwidth of the EVDO card the larger setting is needed. For those of you using Windows ICS note that each machine needs these settings. This does not seem to apply if you're using the KR1 router. The router does all this for you - and incidentally doesn't seem to be optimized. I get much faster speeds with the card directly than I do with the router (but that's another post in another section!)
RWIN is the setting for the maximum TCP Receive Window size. It's the number of bytes that the sender can transmit without receiving an acknowledgement. There are other considerations in setting this number as well - it needs to be an even multiple of the TCP Maximum Segment Size (MSS).
Most of my info for this comes from a great little program called TZ Connection Booster. Using EVDO without increasing these settings results in not maximizing the throughput.
Have fun! |
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xenophon
EVDO Addict
Joined: 30 Aug 2005
Posts: 2004
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| Posted: Fri Feb 17, 2006 3:55 pm Post subject: |
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Tip for FireFox users: Try the FasterFox extension.
https://addons.mozilla.org/extensions/moreinfo.php?id=1269&application=firefox
You have to restart browser after installing.
It doesn't seem to improve performance with Java as Java-based test sites show no improvement. But for javascript and html tests, it does seem to improve performance.
I'm showing improvements on this test site...
www.dslreports.com/mspeed
...but that test site only goes up to 1200Kbits/sec.
I also seem to get better performance using NDIS mode on the Sprint S620 card but I haven't done enough tests to confirm. |
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ebradsha
EVDO Newbie
Joined: 12 Mar 2006
Posts: 3
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| Posted: Sun Mar 12, 2006 3:36 am Post subject: |
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| Just wanted to give the thread starter a BIG THANKS for posting that tip. I increased my Verizon EV-DO performance from 484kbps to 1745kbps! This is no joke, my download speeds literally went from 65ish kilobytes a second to 215 kilobytes a second with this little tweak. Thanks again! |
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horsessmellfunny
EVDO Junkie
Joined: 03 Feb 2006
Posts: 356
Location: Castle Rock, CO
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| Posted: Sun Mar 12, 2006 11:51 am Post subject: |
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| r u sure u didnt just recently enter an EVDO area? That is an extreme increase for this tweak. This tweak only bumps up the speed a little bit, maybe an extra 50kbps. hmmm I would double check that just because that is a little high. But I have seen tranger things happen! Either way, congrats! Thats freakin awesome! lol |
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ebradsha
EVDO Newbie
Joined: 12 Mar 2006
Posts: 3
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| Posted: Sun Mar 12, 2006 12:38 pm Post subject: |
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| horsessmellfunny wrote: | | r u sure u didnt just recently enter an EVDO area? That is an extreme increase for this tweak. This tweak only bumps up the speed a little bit, maybe an extra 50kbps. hmmm I would double check that just because that is a little high. But I have seen tranger things happen! Either way, congrats! Thats freakin awesome! lol |
Yeah I'm positive I was in an EVDO area. I was in the same spot as I was before when I first had the 70 kilobyte download speed to when I got the 220 kilobyte download speeds. Maybe the EVDO towers aren't used as much in my area; we have a lot of EVDO coverage for the amount of people here. |
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Glenn7500
EVDO User
Joined: 03 Feb 2006
Posts: 39
Location: New Orleans, La USA
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| Posted: Sun Mar 12, 2006 1:27 pm Post subject: |
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I have played with my TCP settings quite a bit and here is my personal best using
http://speedtest.frontiernet.net/
Welcome to BBR! Run more tests! see forums
2006-02-14 19:58:59 EST: 973 / 115
Your download speed : 973 kbps or 121.7 KB/sec.
Your upload speed : 115 kbps or 14.4 KB/sec.
Before I changed my TCP I could never get 900 kbps to 1.5 to hold during a download. Below is a list of my tools.
Verizon EVDO
KPC650 Card.
Holding a solid three bars
Firmware Version: CG1.0.06 1 [Apr 06 2005 08:50:45]
PRL Version: 50491
Dr.TCP (windows 2000/XP)
Tcp Receive Window: 128480
Window Scaling: Yes
Time Stamping: No
Everything else: Default
[Note] if TCP settings are changed you must Restart your computer in order for the new TCP setting to be in affect. |
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criggs
EVDO Fledgling
Joined: 20 Mar 2006
Posts: 17
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| Posted: Tue Apr 04, 2006 7:04 am Post subject: Re: SuperCharged EVDO - Free Performance Tip |
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| Zorog wrote: | If you want the best performance from EVDO (I assume that's all of us  ), there is a parameter you should be aware of.
TCP Receive Window Size = 65536
The easiest way to check or change it is by downloading a copy of Dr TCP from Broadband Reports. http://www.dslreports.com/drtcp |
Something doesn't make sense here. When I go to http://www.dslreports.com/tweaks and run the Tweak Tester there, the applet analyzes the results and tells me both what my current TCP Receive Window is and also what it should be. Does that very from connection to connection, from computer to computer, from operating system to operating system?
In any event, I decided to explore this parameter. First I ran several speed tests at various sites, Toast.net, frontier.net, speakeasy.net, dslreports.com, etc. etc. My average download speed was consistently in the low to mid 300s.
Then I went to http://www.dslreports.com/tweaks to see where my TCPRWIN was current set. I ran the Tweak Tester at that page, and was told that my TCP Receive Window was set at 64000+ (forget the exact number). The Tweak Tester didn't like that, and told me to put it between a 4 digit number (I think it was something like 1800) and 17000+.
Well, first I changed it, using the app at http://www.dslreports.com/drtcp , to 65536, as you recommended.
Well, after rebooting and running a speed test, I established to my satisfaction that I was experiencing NO speed improvement whatsoever.
Then I did what the Tweak Tester told me to do, changed to 17000, and did another reboot and another test. Again, no change.
I'm wondering whether it's possible with some cards, some computers, and some operating systems, this adjustment MAKES NO DIFFERENCE WHATSOEVER!!!!!!
For the record, I use a PC5740 card, an HP Pavilion laptop, and the Windows XP Professional with Service Pack 2.
Cheers,
Charles |
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TN-Ken
EVDO Newbie
Joined: 18 Jan 2006
Posts: 9
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| Posted: Tue Apr 04, 2006 8:03 am Post subject: |
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Hey criggs.... yes, it's possible that the setting is dependent on lots of factors. I've heard that the card that you have is significantly slower than a card like the Novatel 620 or Kyocera KP650. It's cheaper but there's a price to pay for that.
I've seen dramatic differences with the TCP receive window size setting - but all I use are the two cards above.
If you can get your hands on one of the other cards it would be interesting to see what difference it made to you. Lots of the differences are in "fringe area" reception as well as speed.
Do you use an external antenna? If you're not getting enough signal to your card then it's not going to use the bandwidth no matter how wide you have it set. |
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criggs
EVDO Fledgling
Joined: 20 Mar 2006
Posts: 17
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| Posted: Tue Apr 04, 2006 9:56 am Post subject: |
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| TN-Ken wrote: | | If you can get your hands on one of the other cards it would be interesting to see what difference it made to you. Lots of the differences are in "fringe area" reception as well as speed. Do you use an external antenna? If you're not getting enough signal to your card then it's not going to use the bandwidth no matter how wide you have it set. |
I'm not in a fringe area, at least I don't thnk so. I consistently get four bars, and my signal strength averages between -60 and -70.
In regard to the above, I have noticed something peculiar. Most of the time my connection speed is below Verizon's claimed floor spec of 400k. Most of the time my connection runs around 300 to 350 (and Verizon has given me a discount of $35 monthly on that basis; that was nice though I'd sooner have the faster speed I was promised).
And here's the peculiar thing. If the signal strength drops BELOW -70 the speed PERKS UP!!! In fact, on occasion, when the signal strength is in the -70s, I get the full 400k spec and then some, frequently getting 500 to 600k for an hour or two. WTF???!!!
I ran this by the folks in another thread here, and someone suggested that there were too many towers in my area and my 5740 was having a hard time locking on to just one tower. They also suggested the Kyocera, though that's a non-starter for me since I really can't afford much more than $200 at this point.
I called up Verizon tech support and suggested that perhaps Verizon should stop handing out the 5740s, since those cards can perhaps no longer handle those areas with a lot of coverage due to the ubiquitous towers. Under the circumstances, perhaps Verizon would concede that giving folks the 5740s was their screwup and they should hand out 650s instead to those folks having speed problems like me.
He put me on hold, and then came back with the following intriguing info: He claimed that EVDO is NOT better the stronger the signal strength. Rather EVDO has a sweet spot with signal strength centered at -80. Anything stronger or weaker than that will result in a correspondingly less speedy connection. He claimed that this is always true with any aircard. (I should have asked him "then why the h**l do you always claim four bars means everything is fine??")
He also said that if he transferred me to Customer Service they would be happy to swap out my current card for a 650. That was a lie. When Customer Service came on, they refused to do any such thing and suggested instead that I go to a Verizon Wireless store and ask them to troubleshoot and test the card. I happen to know that Verizon Wireless stores are NOT equipped to do ANY SUCH THING, but I was too tired to argue at that point and just said thanks and hung up.
Cheers,
Charles |
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TN-Ken
EVDO Newbie
Joined: 18 Jan 2006
Posts: 9
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| Posted: Tue Apr 04, 2006 10:03 am Post subject: |
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Ahh yes - the good ol' Verizon run-around.
The signal strength thing is totally bogus. The stronger the signal the better (at least in my experience). Without my external antenna I drop down into the 300k range but with it I run about twice that fast on average. It's hard to measure 'cause I'm now using the card in a router.
By the way - check out this link for the best speed test.
http://netspeed.stanford.edu/
It's the most reliable that I've found. The others are so dependent on other settings that the results are not as good.
You also haven't mentioned Venturi. I'm assuming that you have it disabled. |
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criggs
EVDO Fledgling
Joined: 20 Mar 2006
Posts: 17
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| Posted: Tue Apr 04, 2006 11:46 am Post subject: |
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| TN-Ken wrote: | | The signal strength thing is totally bogus. The stronger the signal the better (at least in my experience). |
Then how do you explain the fact that my speed DROPS when the strength goes over -65? Is the explanation that other poster gave me, that the 5740 is getting confused by too much signal strength caused by multiple towers, and is having trouble picking and sticking to only one router, probably the correct one?
Thanks; I've bookmarked it.
| Quote: | | You also haven't mentioned Venturi. I'm assuming that you have it disabled. |
Long since, yes, and totally removed and uninstalled as well.
Cheers,
Charles |
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JosiahW
EVDO Newbie
Joined: 17 Apr 2006
Posts: 2
Location: Barstow CA
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| Posted: Tue Apr 18, 2006 12:09 am Post subject: EVDO HELP! SLOW DOWNLOAD |
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| Zorog wrote: |
TCP Receive Window Size = 65536
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OK I did do this. I get about 2-3 bars using my Keyo 650. I don't have a booster antenna yet and would like to know which one is the best to get. I plan on hooking up my card to one of the routers but don't know which router to get either then hooking the booster antenna to the card from the router. I was thinking of getting an antenna that is posted on top of the house for best signal but don't know if that is smart or if it would even matter.
Anyway if you could give me some info on that it would be great but my main concern at the moment is that when I start to download something it starts at 90kbs but quickly almost instantly goes down to about 7 - 10kbs. I have used Dr. TCP and changed my Window Size to 65536 but did not know what else to put in the other options on the program.... what do I put for :
Window Scaling?
Time Stamping?
Selective Acks?
Dial Up (RAS) MTU?
Path MTU Discovery?
Black Hole Detection?
Max. Duplicate ACKs?
TTL?
Under Adapter Settings I only see IEEE 1394 and my Ethernet card. Should I be seeing my Keyo EVDO Card?
What do I put for MTU?
Anything else I should do beside Dr. TCP settings? Is there anything in the Registry that would be worth changing?
Do people get better connection speed on FireFox or IE? I hate IE so I hope it does not matter.
Sorry for all of the questions but thank you for any information.
I also am about to dual-boot with Suse Linux and Windows XP Pro (what I am currently on). Does anybody know what I need for Linux? What drivers, software I should get and where to get it?
Thank you. |
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