You need the tc mirred to get stuff into ifb0. I don't know what the redirect command you are using does. tc -s qdisc will show stats for the cake instance if that was all you need on this platform.
On Wed, Jan 27, 2021 at 9:49 AM <[email protected]> wrote: > > Thanks so much for getting back to me. > First, I am not so expert in these things, so please excuse my questions > about providing the info you have requested and implementing your suggestions. > > 1. I don’t know what imq0 is used for, either. > I don't have a script to run CAKE at system start because I haven't got > it working well enough. So, at reboot, the out-of-the box qdiscs are: > > qdisc ingress ffff: dev eth0 parent ffff:fff1 ---------------- > qdisc pfifo_fast 0: dev imq0 root refcnt 2 bands 3 priomap 1 2 2 2 1 > 2 0 0 1 1 1 1 1 1 1 1 > qdisc pfifo_fast 0: dev ifb0 root refcnt 2 bands 3 priomap 1 2 2 2 1 > 2 0 0 1 1 1 1 1 1 1 1 > > You can see that the imq0 device is present at startup. A quick search > suggests that Ubiquiti uses this for native QOS during egress. If it's not > clear what it's doing and if it's interfering, I will happily remove it, if I > knew how. The worst that happens is that the system crashes and I have to > reboot. > > 2. At startup (so no CAKE), sudo tc qdisc -s show: > > qdisc ingress ffff: dev eth0 parent ffff:fff1 ---------------- > Sent 2055477419 bytes 2270158 pkt (dropped 0, overlimits 0 requeues > 0) > backlog 0b 0p requeues 0 > > qdisc pfifo_fast 0: dev imq0 root refcnt 2 bands 3 priomap 1 2 2 2 1 > 2 0 0 1 1 1 1 1 1 1 1 > Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0) > backlog 0b 0p requeues 0 > > qdisc pfifo_fast 0: dev ifb0 root refcnt 2 bands 3 priomap 1 2 2 2 1 > 2 0 0 1 1 1 1 1 1 1 1 > Sent 2087261885 bytes 2270207 pkt (dropped 0, overlimits 0 requeues > 1) > backlog 0b 0p requeues 1 > > 3. I set up CAKE with the following commands: > sudo tc qdisc add dev eth0 root handle 1:0 cake bandwidth...[switches] > > sudo set interfaces input ifb0 > sudo set interfaces ethernet eth0 redirect ifb0 > sudo tc qdisc add dev ifb0 root handle 2:0 cake bandwidth...[switches] > > Do these commands make CAKE the default, or can I choose a qdisc to use > when running flent? If so, how do I do this? > > 4. Regarding your suggestion: "the download setting up tc mirred I assume you > are doing with sqm? Do that." > > This is outside my knowledge, and I have not done anything like that. > I have read an alternative (older?) way to set up CAKE for ingress: > sudo ip link add name ifb4eth0 type ifb > sudo tc qdisc del dev eth0 ingress > sudo tc qdisc add dev eth0 handle ffff: ingress > sudo tc qdisc del dev ifb4eth0 root > sudo tc qdisc add dev ifb4eth0 root cake bandwidth... > sudo ifconfig ifb4eth1 up > sudo tc filter add dev eth1 parent ffff: protocol all prio 10 u32 > match u32 0 0 flowid 1:1 action mirred egress redirect dev ifb4eth1 > > I suspect the first 6 lines of this code achieve the same thing as the > first two lines of code that I used (see point 3, above). Am I right? > Is the filter that is specified in the last line what you are suggesting > I add? > > This is about as much as I can address with what you have suggested, without > a super long email. > > Please feel free to correct my mistakes in understanding. > If you have suggestions based on what I have written, I would so grateful. I > am really looking forward to hearing what you think. > This learning curve is a little steep. > > Many thanks. > > > -----Original Message----- > From: Dave Taht <[email protected]> > Sent: Tuesday, January 26, 2021 11:19 PM > To: [email protected] > Cc: Cake List <[email protected]> > Subject: Re: [Cake] Trouble getting decent performance with CAKE > > As much as I like to get the fustest with the mostest with the rrul test, it > is often easier to test up and down separately. > > do : > > tc qdisc delete ifb0 root > tc qdisc delete eth0 root > > I am not sure what imq is being used for.... > > Can you share the output of tc -s > > instead? > > a simple upload test would then be: > > (unless you made cake the default) > > flent -t pfifo_fast -H wherever --socket-stats -x --te=upload_streams=4 > tcp_nup > > tc qdisc add dev eth0 root cake all_your_options > > flent -t cake -H wherever --socket-stats -x --te=upload_streams=4 tcp_nup > > the download setting up tc mirred I assume you are doing with sqm? Do that. > > flent -t -H wherever --socket-stats -x --te=download_streams=4 tcp_ndown > > then send tc -s > > It's entirely feasible your so-called 100mbit service is running at far far > less than 100mbit in the first place. > > Another thing to check is if your modem is connecting to the device at > 100Mbit or a gbit. SOME - not enough - dsl modems actually connect at 100Mbit > and/or joy of joys excert hw flow control. > 95Mbit is gonna be slightly too high in former case for cake to control > things, try 92mbit, or less. > > On Tue, Jan 26, 2021 at 4:22 PM <[email protected]> wrote: > > > > Dear CAKE experts, > > > > I write for your help in getting CAKE to perform on my router as I > > understand it should. > > > > > > > > I replaced my aging Asus home router with a Ubiquiti Edgerouter 4 > > specifically so I could take advantage of the port of CAKE to it. > > > > > > > > I am in the US, with VDSL2 service provided by AT&T at 100/20. I now have > > all unfiltered traffic delivered by the AT&T modem to the eth0 port on the > > router. > > > > > > > > My desktop runs Windows. So, to take advantage of flent to quantify CAKE > > performance, I stood up a Linux Mint VM and ran flent rrul tests before > > CAKE installation, and after. > > > > > > > > The first attached datafile, labeled qdisc pfifo fast, is the performance > > before CAKE. The other file, called 20/95 ack filtered bridged ptm, is my > > latest attempt with configuring CAKE flags. > > > > My major issue is with Ingress. Egress seems fine. > > > > For ingress, I see very little difference between performances with and > > without CAKE. And the overall throughput is far less than 100 mbit. > > > > > > > > The queuing disciplines on the router are: > > > > > > > > jeremymarks@ubnt:~$ sudo tc qdisc show > > > > > > > > qdisc cake 1: dev eth0 root refcnt 2 bandwidth 20Mbit besteffort > > dual-srchost nat nowash ack-filter split-gso rtt 100.0ms ptm overhead > > 22 no-sce > > > > qdisc ingress ffff: dev eth0 parent ffff:fff1 ---------------- > > > > qdisc pfifo_fast 0: dev imq0 root refcnt 2 bands 3 priomap 1 2 2 2 1 > > 2 0 0 1 1 1 1 1 1 1 1 > > > > qdisc cake 2: dev ifb0 root refcnt 2 bandwidth 95Mbit besteffort > > dual-dsthost nat nowash ingress ack-filter split-gso rtt 100.0ms ptm > > overhead 22 no-sce > > > > > > > > I must be making a major mistake in configuring CAKE. > > > > > > > > I would be grateful for any help or advice in getting this amazing program > > to work as it should. > > > > > > > > Many thanks for any help. > > > > Jeremy > > > > > > > > > > > > _______________________________________________ > > Cake mailing list > > [email protected] > > https://lists.bufferbloat.net/listinfo/cake > > > > -- > "For a successful technology, reality must take precedence over public > relations, for Mother Nature cannot be fooled" - Richard Feynman > > [email protected] <Dave Täht> CTO, TekLibre, LLC Tel: 1-831-435-0729 > -- "For a successful technology, reality must take precedence over public relations, for Mother Nature cannot be fooled" - Richard Feynman [email protected] <Dave Täht> CTO, TekLibre, LLC Tel: 1-831-435-0729 _______________________________________________ Cake mailing list [email protected] https://lists.bufferbloat.net/listinfo/cake
