SG Broadband Community

Well I've been trying different RWIN Multiples, and I cant seem to find a good one! heh maybe someone could help, well someone posted they had like 20940, I tried that and got a Blue screen of death in the VxD or whatever that thing is, I know thats the registry setting where Microsoft screwed up and I got the patch soo i figured it was just a bad RWIN multiple, and it works now but I set it quite high, so I got More packet loss i think, I cant really tell whether Im getting packet loss, Ive done the speed tests on several sites, Im fine by them except I just seem to be going ALOT slower on page loading, this is my current settings

TCP options string = 020405ac0103030301010402

MTU = 1492
MTU seems to be optimized for PPPoE... If you are not on a PPPoE connection, consider increasing your MTU to 1500 for optimal throughput.

MSS = 1452
Maximum useful data in each packet = 1452, which is equal to MSS.
MSS is optimized for PPPoE. If you are not on a PPPoE connection, consider increasing your MTU value.

Default Receive Window (RWIN) = 511104
RWIN Scaling (RFC1323) = 3 bits
Unscaled Receive Window = 63888
RWIN is a multiple of MSS
Other values for RWIN that might work well with your current MTU/MSS:
255552 (MSS x 44 * scale factor of 4)
127776 (MSS x 44 * scale factor of 2)
63888 (MSS x 44)

bandwidth * delay product:
Your RcvWindow limits you to: 20444.16 kbps (2555.52 KBytes/s) @ 200ms
Your RcvWindow limits you to: 8177.664 kbps (1022.208 KBytes/s) @ 500ms

MTU Discovery (RFC1191) = ON

Time to live left = 117 hops
TTL value is ok.

Timestamps (RFC1323) = OFF

Selective Acknowledgements (RFC2018) = ON

IP type of service field (RFC1349)= 00000000


Like I said I tried alll sorts of Multiples, some seem to be tooo small, some seem Too big so I get more packet loss, if someone could help me with a good RWIN multiple I'd greatly appreciate it..
As U can tell Im using PPPoE software, but I dont connect through with it, I just use normal Windows Dial Up Networking to dial into.. If any more info is needed plz post, because I really wanna get this fixed thx!

Lower your RWIN to 64240 and reboot. Lemme know how it works

What are your service caps or your ISP's advertised speed?

HL, he should try 63888 instead because he has an MSS of 1452 and 64240 will not be a multipule.

Just read a past post of yours and if you're capped at 1500 kbps down then try these. 18873, 27588, 37752, 46464 or 56628

I think caps are 1.5 MB Downloads... but Ive done the speed test its like 1365KB :-/
BTW Im trying those settings now.. lemme reboot heh

I read a past post of yours and edited my original reply to include more RWIN valuse to try.

I set the RWIN to 18000 while I was setting my MTU for max of the PPPoE connection (1492) and I was going kinda fast.. the only prob was I was D/Ling at about 25KB per second when i should be like about 150 KB :-/

Try the higher values I gave you. All those values are based on your max download speed (1500 kbps) but with different latency variables. If they don't work I can suggest some others to try that are higher.

I have a PPPoE connection with 1.536 Mbps down and 384 Kbps up on Fastpath with low latency and no packet loss. Try values in the range of 32K and 64K, specifically 31944 and 63888 for an MSS of 1452 and an MTU of 1492. You may use other values, but they should be latency dependent. The less latency you have the smaller the RWIN necessary for optimum throughput. Low latency is defined to be less than 50 ms. When you start to go around 100 ms you are getting into a high latency issue for terrestrial connections. Satellite connections are notorious for very high latency. Terrestrial connections have this condition only when there is non optimum routing and/or congestion. Packet loss is something that the ISP must fix, not much else can be done it.

right now I got a general latency of about 30-45.. soo which setting SHOULD i use? ive tried Id say about 10 settings? each seem about the same

u should make ur mtu 1500

For PPPoE your MTU should be 1492 as a maximum value. Try the lower RWIN first, it should do well.

Test running..........
** Speed 951(down)/683(up) kbps **
(At least 19 times faster than a 56k modem)
Logging result
Finish.

I used to be around 1300(down)
:-(
any Ideas?

Try this URL for throughput testing. Use the value that gives you about 85% of 1500, which is about 1275. This will be your max throughput. Use ALL of the servers that are near you and use the highest value attained.



http://www.speakeasy.net/main.php?page=sup_pops

Try 63888 on the web sites I posted.

I was just rereading one of your previous posts and it claims an upload speed of 6XX which is not indicative of ADSL. Typically, ADSL has an upload cap of around 384 Kbps. Your DSLAM may have been reprovisioned incorrectly making you SDSL at a lower speed. If you can achieve a download speed of say around 1250-1300 kbps with an upload of say no more than about 300 kbps then you are OK. I am suspicious of an upload speed greater than 300 kbps. You may want to contact your ISP to have them reprovision you, if nothing else works.

Try using 74052 as your RWIN. I think it will work well with your connection, and you should also have alot less packet loss with it.

If you use an RWIN larger than 65535 you must turn on Window Scaling. Just a friendly reminder!!! I also recommend that Time Stamping remain OFF as it is not used in most cases.