I'm measuring at the upstream router which is actually a Procera Box. (not actually a rotuer) Customer called last night complaining speeds were horrible....
Kurt Fankhauser Wavelinc Communications P.O. Box 126 Bucyrus, OH 44820 http://www.wavelinc.com tel. 419-562-6405 fax. 419-617-0110 On Sun, Apr 26, 2015 at 12:01 PM, Ken Hohhof <[email protected]> wrote: > Sorry to answer a question with a question, but are you measuring at > the SM, or at some upstream router? > > The reason I ask, is I have seen some CDN traffic that does not seem to > follow traditional TCP congestion control. It will send at twice the rate > limit, causing 50% packet loss to its own traffic and everything else to > that same subscriber. Evidently some TCP geniuses have decided to use > latency rather than packet loss as the indicator of congestion, and that > the objective is goodput not throughput. Works for last mile technologies > like T1 and DSL with big buffers at the head end of the fixed speed serial > connection, not so good with the type of rate limit queues we tend to use > unless we can provision the queues with big buffers. > > Probably not your problem, but I thought I’d bring it up just in case. > > *From:* Kurt Fankhauser <[email protected]> > *Sent:* Sunday, April 26, 2015 10:50 AM > *To:* [email protected] > *Subject:* [AFMUG] 450SM sustain bucket throttle not working.. > > I have a 450 SM that is rate limited in the SM to 1500kbps download on > the sustain side. I noticed last night that this customer was pulling a > steady almost 3mbps download for several hours on end. How is this > possible? Is there a problem with 13.2 firmware? Its a 3.65ghz SM. > > see attached. > > Kurt Fankhauser > > Wavelinc Communications > > P.O. Box 126 > > Bucyrus, OH 44820 > > http://www.wavelinc.com > > tel. 419-562-6405 > > fax. 419-617-0110 >
