Hi Sebastian, > I probably would try to instantiate cake not on the wan but on > a lan interface of the router and re-do the test without the “nat” > option just to reduce the number of tested parts. If you should do > this, please remember that ingress and egress are per interface, so > downloads from the internet use the LAN-egress while internet- uploads > use LAN-ingress, so make sure to switch the bandwidth definitions for > your two cake instances accordingly. > Finally could you post the results of “tc -s qdisc” before, > during and after your bit-torrent tests for the test you just > reported and the LAN test in case you ago that route.
I tried what you suggested on the LAN interface (ingress: 900kbit/s, egress: 3300kbit/s). Details follow. > > and when doing simple > > things (i.e. downloading from a couple of websites) the bandwidth > > is > > divided fair per-host, i.e 1:1 between A and B. > > Okay, does this stay fair if one of the hosts open a bunch of > websites at the same time? Does the download test also give per-host > fairness if the number of downloads is massively imbalanced between > the hosts? There seems to be a discrepancy here. If host A is downloading a file (e.g. kernel.org) and host B opens a bunch of websites simultaneously (e.g. "firefox arstechnica.com; firefox in.gr; firefox phoronix.com; firefox cnn.com; firefox theguardian.co.uk") the following happens: for the first 20 seconds host B gets 90% of the bandwidth and then it slowly equilibrates to 50%-50%. > > However, when one of > > the hosts is using bittorrent, he also gets most of the bandwidth, > > i.e. > > if total ingress bandwidth is 3300kbit, A is using bittorrent and > > gets > > 2900kbit, B is downloading from a single website and gets 400kbit. > > Bit-torrent is a hard problem it seems, especially the cobalts > branch that you test is supposed to better deal with it though so > this is abit of a puzzle. How long are your tests? Are you looking > only at a few seconds or something like >30 seconds (maybe the shaper > needs time to reach equilibrium)? What happens in the upload during > theses tests? I also wonder how many new torrent connections are > established during the test or are the torrent flows long lived? > I am performing this test for 5 minutes, using the torrent for ubuntu- 16.10-desktop. Regarding new established torrent connections, these are around 50 in this 5-minute interval. You *can* browse the web from host B but there is notable latency. Pings to 8.8.8.8 are typically 300- 400msec. Best regards, George _______________________________________________ Cake mailing list [email protected] https://lists.bufferbloat.net/listinfo/cake
