Screenplay Posted January 24, 2006 CID Share Posted January 24, 2006 I am having problems with my speed. I have cox cable advertised at 4.0. When I do speed test some days I will be up to 5.1 but on others I will be down to .8. What is the deal??? I always keep up with ad aware and virus scans. Plus I have already downloaded the cablenut program (think that is why I get 5.1 sometimes). Any help would be great. P.S. could it be my modem? It is old Surfboard sb3100 Link to comment Share on other sites More sharing options...
trogers Posted February 10, 2006 CID Share Posted February 10, 2006 Could be that your RWIN setting has been set too precised for a specfic latency value. Example using the RWIN formula RWIN = bandwidth x latency divided by 8 (bit) = ________ KBytes Say you bandwidth is 4000 Kbps and you design your ccs file for a 100 ms latency RWIN = 4000 x 100 / 8 = 50000 Everything is all balanced. You get your throughput of 4000 Mbps. If latency falls to 80 ms, your throughput goes up to 5 Mbps. What happens to your throughput when latency to a particular site is 300 ms? Bandwidth = RWIN x 8 divided by latency Bandwidth = 50000 x 8 / 300 = 1333 Kbps. (compared it to your original bandwidth 4000 Kbps) Now your download speed falls by two-third. Link to comment Share on other sites More sharing options...
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