johkal

Don't worry about the receive buffer. Every time you run the web100 test, it will give you a different suggestion on buffer size. Network traffic determines their suggestion of size. The Rwin suggested on DslReports starts at a low range for your connection. You would be ok with 10220. I have been tweaking PCs for years and know per your tests and specs that your Rwin can be pushed to 21780 safely(based on an MTU of 1492). Your connection looks good. Enjoy! Forgot to add: If you want to experiment further with rwins, stay between 10220 & 21900. Try: 13140, 16060, 18980 & 21900 These are all multiples of MMS(1460) Example: 1460 x 7 =10220 My suggestion for 21780 was based on an MTU of 1492(MMS 1452) not 1500. You see in my list of Rwins that 21900 is there and not 21780. Not knowing which MTU you were using; 21780 was safe.

Looking good thus far. Run these tests for me and post results: http://web100.rit.edu:7123/ http://www.dslreports.com/tweaks

Using DrTCP Use these settings Rwin: 21780 Window scaling: Off Time stamping: Off Selective ACKs: On Path MTU Discovery: On Max Duplicate ACKs: 2 MTU: Try 1500 or 1492

What is your advertised speed from your ISP? (example: 6000/768)Do you have DSL or Cable? I see you did much better with an Rwin of 10164.

You can visit: http://www.dslreports.com/ You will find DrTCP in Tests & Tools

To Keith_L, The only thing I agree with is: " RWIN is the most important setting realated to internet connection speed. Setting it too low can limit your throughput and setting too high could also reduce your connection speed." When you use the term "Max Setting", this is a term I associate with "One Size Fits All". To suggest an Rwin of 256960, which you've stated is a Max setting is clearly not suited for everyones individual computers and connections. This too high Rwin will cause lower download rates and can cause page lag. The optimum Rwin is an Rwin that is the lowest value that gives you consistant speeds. One size does not fit all. This Rwin your utility sets does not take into consideration average ping times/latency in the calculation. In fact, there is no calculation, just a Max setting. One size fits all? No, it certainly does not. If I was a size 9 shoe, why would I want to wear a size "36"?