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Proxomitron reduces RWIN to 32768
Nov. 12, 2005, 03:55 AM
Post: #80
 
z12 Wrote:[As I noted above, I use XP Pro SP2 and have the issue. In fact, I find it hard to believe that users of other win os's don't have this problem.

Well, having done a bit of Googling, the default RWIN for Win9x and NT is apparently 8760 and for Me/2k and XP 17520 (presumably sp1), all of which are less than Proxomitron's setting of 32768. XP Home and Pro however have dynamic settings for RWIN - the others being static - though the scaling for large Window sizes isn't apparently enabled by default. 65535 is the highest achievable without scaling.

Now some gamers noticed that installing sp2 changed both the RWIN and the MTU, unoptimising their machines from their POV. OTOH, other folk noticed that their cable connection speeded up. That's probably where our main problem lies.

"While it may be possible to fake xp into using a larger MTU, I doubt any routers will pass frames larger than 1500 bytes, resulting in fragmentation. You can increase the size of the receive buffer up to 1GB, but this brings us right back where we are now. No matter what registry setting I have for the window size, proxo sets it to 32768. "

Well, this is why I said we need kuruden's opinion - he's actually built this sort of filter, and has undoubtedly analysed Proxomitron. We're only having a guess at what it's doing, where as he undoubtedly knows. Can someone tap him on the shoulder and ask him to contribute? Hell, there may or may not be stuff here relevant to the design of Proximodo. Does anyone know what the RWIN is for Proximodo?

"Any test that does not report the rwin as advertised via the TCP header is meaningless."

I'd go with that. I'd like to know how dslreport's tester does its business though - but that will take one of the java folk round here.

As to Peakaboo's question:

1) With a fully patched XP home SP2 system, and fixed tcpip.sys via lvllord's fix, if I read the data on wininet.dll correctly http://support.microsoft.com/?kbid=320721 the server limit for http & http1 of 4 & 2 go away and the issue of greater than 10 simultaneous connections goes away. Is this correct?

The limits are, according to Internet specifications, 2 established connections - though how many servers actually enforce this is another matter. :-) OTOH, it's another case of default settings in the registry. MS tell you how to fiddle with it in one of their technical notes, but then cop out and tell you that you're breaking internet specs - this from a company that does its own thing on specs when it feels like it. :-) Anyway, if the standards are enforced, other potential connections outside those two have to wait half open, i.e. not yet established because the three way handshake hasn't been completed, and the limit on those simultaneous half-open connections is, in sp2, a maximum of ten. It was, in earlier OS, 50. So you could get a bottle neck on top of the smaller RWIN. Increase the number of simultaneous established connections, and the number of allowed simultaneous half-open connections, and your bottleneck vanishes or is at least reduced. You won't affect the RWIN of Proxomitron, but you'll have lots of simultaneous connections offsetting that chokepoint. It's a bit like sucking a thick milkshake through a straw - you can either increase the size of the straw or use several straws of the same size.

From those figures, OS below XP were never in any danger of exceeding the limits on Proxomitron's window. Presumably sp1 could have done, but for some reason (probably Microsoft's default registry settings) it didn't. Installation of sp2 on the other hand has been observed to to increase speed on cable connections, and sent a load of gamers back to retweak their machines for internet gaming.

"As mentioned earlier, I do not have any training or expertise in this area at all as you can probably tell. For some reason this problem is interesting to me as far as finding the root cause and potential solution."

Well, I'm not an IT professional - I'm an archaeologist by training, though archaeologists do use computers as well as shovels. :-) I just got interested enough in this stuff, years ago, to try research it and understand it, mostly by getting my hands dirty, listening to other folk, picking folks' brains, experimenting with the damned things, occasionally going "what if?" and getting daft jobs at work, such as the boss telling me, 4 hours before he's due to go, "On this trip I want to access the internet - you've got a laptop and a mobile phone, sort it", back in the days when this was almost unheard of. Nothing like being asked the impossible for a learning curve! :-) And no, we didn't have the relevant software to hand. :-) Even got round to building a PC from spares back in the days of 386s. :-) Plus rarely having any support service, cos I was originally using second hand machines, so you have to learn how to dig yourself out of problems, cos no one else will. On the only occasion I did have a support contract, it lasted 3 months, cos the company refused to support the machine any further if I got rid of the crap Me they insisted on selling me (I wanted 2000 or NT) and replaced it with XP. So fine - I told them to stuff it, got rid of Me and installed XP, upgraded drivers, software, the lot. This machine has been disowned by its vendor ever since. :-) It's Not As Per Original Spec as far as software goes. :-) Give me a bit of money and it will be less of the original spec as far as hardware goes. :-)

In short, basically bugger around with the things, pick brains, read and somewhere along the line you learn things. Not as much as an IT professional, but enough to get by. As for programming - well I take my hats off to the likes of Kye-U, Sidki and the others round here who develop the Java filters. I've about got my head round HTML filtering, but that's as far as it goes.

Kevin
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Messages In This Thread
Proxomitron reduces RWIN to 32768 - Tony Tough - Oct. 19, 2005, 06:12 AM
RE: Proxomitron reduces RWIN to 32768 - JJoe - Jan. 10, 2007, 04:09 AM
RE: Proxomitron reduces RWIN to 32768 - Guest - Sep. 28, 2008, 07:17 PM
RE: Proxomitron reduces RWIN to 32768 - Mele20 - Sep. 29, 2008, 12:07 PM
RE: Proxomitron reduces RWIN to 32768 - Kye-U - Sep. 30, 2008, 05:54 PM
RE: Proxomitron reduces RWIN to 32768 - Kye-U - Oct. 09, 2008, 12:22 AM
RE: Proxomitron reduces RWIN to 32768 - Guest - Oct. 14, 2008, 03:16 PM
[] - Kye-U - Oct. 19, 2005, 09:23 PM
[] - elshaddai - Oct. 20, 2005, 12:13 AM
[] - Kye-U - Oct. 20, 2005, 05:00 AM
[] - Guest - Oct. 20, 2005, 06:13 AM
[] - Tony Tough - Oct. 20, 2005, 06:15 AM
[] - Peakaboo - Oct. 20, 2005, 05:27 PM
[] - Kye-U - Oct. 20, 2005, 07:52 PM
[] - Oddysey - Oct. 21, 2005, 07:50 AM
[] - Tony Tough - Oct. 21, 2005, 08:19 AM
Same problem under windows98SE - mambo - Oct. 21, 2005, 08:27 AM
[] - Ralph - Oct. 21, 2005, 12:11 PM
[] - Tony Tough - Oct. 21, 2005, 12:24 PM
[] - Peakaboo - Oct. 21, 2005, 12:39 PM
[] - mambo - Oct. 21, 2005, 12:46 PM
[] - mambo - Oct. 21, 2005, 01:20 PM
[] - Peakaboo - Oct. 21, 2005, 01:40 PM
[] - elshaddai - Oct. 21, 2005, 04:45 PM
Cable Modem - mozerd - Oct. 21, 2005, 05:52 PM
Re: Cable Modem - Peakaboo - Oct. 21, 2005, 06:36 PM
[] - Kye-U - Oct. 21, 2005, 07:43 PM
[] - Kye-U - Oct. 21, 2005, 07:44 PM
Re: Cable Modem - Guest - Oct. 23, 2005, 09:56 PM
Re: Cable Modem - mozerd - Oct. 23, 2005, 11:24 PM
Re: Cable Modem - Guest - Oct. 24, 2005, 02:54 AM
Re: Cable Modem - Tony Tough - Oct. 24, 2005, 05:43 PM
[] - Tony Tough - Oct. 24, 2005, 06:00 PM
[] - hpguru - Oct. 24, 2005, 09:18 PM
[] - Guest - Oct. 24, 2005, 09:35 PM
[] - Guest - Oct. 24, 2005, 09:40 PM
[] - z12 - Oct. 24, 2005, 09:59 PM
[] - Peakaboo - Oct. 24, 2005, 10:24 PM
[] - hpguru - Oct. 24, 2005, 10:30 PM
[] - Guest - Oct. 24, 2005, 10:35 PM
[] - Guest - Oct. 24, 2005, 10:38 PM
[] - Guest - Oct. 25, 2005, 04:11 AM
[] - Guest - Oct. 25, 2005, 04:22 AM
[] - hpguru - Oct. 25, 2005, 07:47 AM
[] - z12 - Oct. 25, 2005, 12:38 PM
[] - ProxRocks - Oct. 25, 2005, 12:38 PM
[] - z12 - Oct. 25, 2005, 01:01 PM
[] - ProxRocks - Oct. 25, 2005, 01:17 PM
[] - Tony Tough - Oct. 25, 2005, 01:21 PM
[] - z12 - Oct. 25, 2005, 01:43 PM
[] - Peakaboo - Oct. 25, 2005, 02:06 PM
[] - hpguru - Oct. 25, 2005, 02:53 PM
[] - JJoe - Oct. 25, 2005, 04:45 PM
[] - mambo - Oct. 25, 2005, 05:09 PM
[] - z12 - Oct. 26, 2005, 01:23 AM
[] - Peakaboo - Oct. 26, 2005, 02:16 AM
[] - z12 - Oct. 26, 2005, 10:21 AM
[] - Oddysey - Oct. 26, 2005, 07:54 PM
[] - z12 - Oct. 26, 2005, 11:46 PM
[] - Oddysey - Oct. 27, 2005, 03:09 AM
[] - z12 - Oct. 27, 2005, 02:31 PM
[] - Peakaboo - Oct. 30, 2005, 01:41 AM
[] - WildTbag - Oct. 31, 2005, 12:45 AM
[] - Oddysey - Oct. 31, 2005, 02:41 AM
[] - ProxRocks - Oct. 31, 2005, 01:30 PM
[] - laighleas - Nov. 04, 2005, 12:36 PM
[] - laighleas - Nov. 04, 2005, 12:52 PM
[] - laighleas - Nov. 04, 2005, 02:02 PM
[] - Peakaboo - Nov. 04, 2005, 03:17 PM
[] - JJoe - Nov. 04, 2005, 06:08 PM
[] - Kye-U - Nov. 04, 2005, 08:50 PM
[] - ProxRocks - Nov. 04, 2005, 09:39 PM
[] - Peakaboo - Nov. 05, 2005, 03:33 AM
[] - z12 - Nov. 06, 2005, 02:37 PM
[] - laighleas - Nov. 09, 2005, 07:43 PM
[] - laighleas - Nov. 09, 2005, 07:50 PM
[] - JJoe - Nov. 09, 2005, 10:28 PM
[] - laighleas - Nov. 10, 2005, 03:03 AM
[] - JJoe - Nov. 10, 2005, 05:45 AM
[] - z12 - Nov. 10, 2005, 10:56 AM
[] - laighleas - Nov. 10, 2005, 12:18 PM
[] - laighleas - Nov. 10, 2005, 12:52 PM
[] - laighleas - Nov. 10, 2005, 01:05 PM
[] - Peakaboo - Nov. 11, 2005, 07:04 PM
[] - z12 - Nov. 12, 2005, 02:18 AM
[] - laighleas - Nov. 12, 2005 03:55 AM
[] - laighleas - Nov. 12, 2005, 04:56 AM
[] - z12 - Nov. 13, 2005, 07:26 AM
[] - Peakaboo - Nov. 13, 2005, 04:59 PM
[] - z12 - Nov. 13, 2005, 08:34 PM
[] - Oddysey - Nov. 13, 2005, 08:40 PM
[] - Peakaboo - Nov. 13, 2005, 09:23 PM
[] - z12 - Nov. 13, 2005, 10:43 PM
[] - Peakaboo - Nov. 14, 2005, 03:12 AM
[] - laighleas - Nov. 14, 2005, 03:36 PM
[] - Guest - Nov. 14, 2005, 04:32 PM
[] - Oddysey - Nov. 14, 2005, 07:47 PM
[] - Kye-U - Nov. 15, 2005, 12:07 AM
[] - z12 - Nov. 15, 2005, 05:14 PM
[] - Kye-U - Nov. 16, 2005, 06:20 AM
[] - laighleas - Nov. 26, 2005, 03:25 PM
RE: Proxomitron reduces RWIN to 32768 - JJoe - Nov. 26, 2005, 09:55 PM
[] - laighleas - Nov. 27, 2005, 02:16 AM
[] - Kye-U - Nov. 27, 2005, 02:37 AM
[] - Siamesecat - Nov. 27, 2005, 06:50 AM
[] - JJoe - Nov. 27, 2005, 08:25 AM
[] - Peakaboo - Nov. 28, 2005, 03:26 AM
[] - Kye-U - Nov. 28, 2005, 05:00 AM
[] - JJoe - Nov. 28, 2005, 06:17 AM
[] - Siamesecat - Nov. 28, 2005, 07:04 AM
[] - JJoe - Nov. 28, 2005, 01:53 PM
[] - Peakaboo - Nov. 28, 2005, 02:22 PM
[] - JJoe - Nov. 28, 2005, 03:30 PM
[] - JJoe - Nov. 28, 2005, 05:00 PM
[] - Kye-U - Nov. 28, 2005, 09:30 PM
[] - Siamesecat - Nov. 29, 2005, 08:02 AM
[] - JJoe - Nov. 29, 2005, 04:33 PM
[] - Siamesecat - Nov. 29, 2005, 08:14 PM
[] - JJoe - Nov. 30, 2005, 04:49 AM
[] - JJoe - Nov. 30, 2005, 05:12 AM
[] - Siamesecat - Nov. 30, 2005, 07:19 AM
[] - Guest - Nov. 30, 2005, 10:40 AM
[] - toods - Nov. 30, 2005, 12:45 PM
[] - JJoe - Nov. 30, 2005, 03:31 PM
[] - Tony Tough - Nov. 30, 2005, 03:56 PM
[] - Siamesecat - Dec. 01, 2005, 06:34 AM
[] - JJoe - Dec. 01, 2005, 03:33 PM
[] - laighleas - Dec. 01, 2005, 11:45 PM
[] - JJoe - Dec. 02, 2005, 12:56 AM
[] - Oddysey - Dec. 02, 2005, 12:59 AM
[] - Siamesecat - Dec. 02, 2005, 08:23 AM
[] - peakaboo g - Dec. 02, 2005, 02:50 PM
[] - JJoe - Dec. 02, 2005, 03:34 PM
[] - laighleas - Dec. 02, 2005, 04:58 PM
[] - laighleas - Dec. 02, 2005, 05:00 PM
[] - JJoe - Dec. 02, 2005, 11:35 PM
[] - Oddysey - Dec. 03, 2005, 12:03 AM
[] - laighleas - Dec. 03, 2005, 12:13 AM
[] - Siamesecat - Dec. 03, 2005, 07:15 PM
[] - Siamesecat - Dec. 04, 2005, 01:46 AM
[] - JJoe - Dec. 04, 2005, 04:46 AM
[] - Siamesecat - Dec. 04, 2005, 07:06 AM
[] - JJoe - Dec. 04, 2005, 06:11 PM
[] - Siamesecat - Dec. 05, 2005, 06:44 AM
[] - JJoe - Dec. 05, 2005, 09:48 PM
[] - Siamesecat - Dec. 06, 2005, 06:23 AM
[] - JJoe - Dec. 06, 2005, 09:33 PM
[] - Siamesecat - Dec. 07, 2005, 06:00 AM

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