* Federico Giannici <giann...@neomedia.it> [2014-08-22 09:51]: > On 08/22/14 08:22, Henning Brauer wrote: > >* Adam Thompson <athom...@athompso.net> [2014-08-21 19:13]: > >>Unless I've mis-understood all the emails and reports about this, it > >>affects low-bandwidth queues, not low-bandwidth interfaces. > >>In other words, limiting traffic to 50Mbps on a 1Gb link will work fine, > >>limiting it to 50kbps on the same link will not. > >> > >>Yes/no? > > > >pretty much. > > I can imagine that it could be rather complicated to give the exact numbers, > but can you give me an idea where the problem comes from, and maybe where I > can find more info about it?
kinda obvious: BW measurement and go/holdoff decision is (at most) once per tick. ticks @ HZ, aka 100 ticks per second with HZ=100. If the NIC can transfer "too much" data within one tick, the bw shaping becomes inaccurate. Obviously worse the bigger the difference between interface speed and desired queue speed is. -- Henning Brauer, h...@bsws.de, henn...@openbsd.org BS Web Services GmbH, http://bsws.de, Full-Service ISP Secure Hosting, Mail and DNS. Virtual & Dedicated Servers, Root to Fully Managed Henning Brauer Consulting, http://henningbrauer.com/
