On Wed, Oct 10, 2012 at 04:29:11PM -0700, Stephen Hemminger wrote: > On Wed, 10 Oct 2012 19:27:11 -0400 > Michael Richardson <[email protected]> wrote: > > > > > >> But: It became obvious fast that long RTT tests were needed, > > >> which I've been trying to establish the infrastructure to do > > > > toke> I assume that by "infrastructure" you mean "(netperf) servers > > toke> far away"? What would be needed for a test server in terms of > > toke> resources (bandwidth and otherwise)? I could try and persuade > > toke> my university to let me setup a test server on their network > > toke> (which is in Denmark)... > > > > I interpret the question to mean networks where is there significant > > actual delay along them. I seem to recall that there are some ways to > > do this Linux machines, but most commercial test equipment can simulate > > things, including dropping packets. > > I think, however, that we do not want/need and packets dropped, as then > > the bandwidth constraint would not be in the device under test. > > netem can do all the stuff commercial gear can. > In fact, it is used by one of the commercial products!
similarly you can use ipfw+dummynet, it has been running on Linux and a variety of other OS for a long time, see http://info.iet.unipi.it/~luigi/dummynet/ cheers luigi _______________________________________________ Codel mailing list [email protected] https://lists.bufferbloat.net/listinfo/codel
