[Cake] Cake, low speed ADSL & fwmark

[Y]

Hi,all

My situation is/was similer.
I prefer to use cake because it costs lower cpu time than htb + fq_codel.

tc qdisc add root dev eth0 cake bandwidth 810kbit pppoa-vcmux diffserv4 
ack-filter-aggressive dual-srchost

pi at raspberrypi:~ $ tc -s qdisc show dev eth0
qdisc cake 8023: root refcnt 2 bandwidth 810Kbit diffserv4 dual-srchost 
nonat nowash ack-filter-aggressive split-gso rtt 100.0ms atm overhead 10
  Sent 18265833249 bytes 23590044 pkt (dropped 7172987, overlimits 
53950415 requeues 11)
  backlog 1444b 1p requeues 11
  memory used: 130147b of 4Mb
  capacity estimate: 810Kbit
  min/max network layer size:           30 /    1478
  min/max overhead-adjusted size:       53 /    1643
  average network hdr offset:           14

                    Bulk  Best Effort        Video        Voice
   thresh       50624bit      810Kbit      405Kbit    202496bit
   target        356.5ms       22.3ms       44.6ms       89.1ms
   interval      713.0ms      117.3ms      139.6ms      184.1ms
   pk_delay       62.6ms      132.6ms       13.8ms       86.4ms
   av_delay        9.0ms       42.3ms        7.2ms       14.8ms
   sp_delay        1.3ms        5.5ms        981us        3.6ms
   backlog            0b        1444b           0b           0b
   pkts              369     30744151         8116        10396
   bytes           19926  23924477414       438264      5958198
   way_inds            0      6553855            4            1
   way_miss          250      1048934         4749          205
   way_cols            0            0            0            0
   drops               0      4430387            0            0
   marks               0         7611            0            0
   ack_drop            0      2742600            0            0
   sp_flows            1            4            1            1
   bk_flows            0            2            0            0
   un_flows            0            0            0            0
   max_len            54         2984           54          590
   quantum           300          300          300          300



On 28/07/2020 06:41, Jim Geo wrote:
> Hello,
> 
> Thank you for all the efforts you have done to make internet usable.
> 
> I currently use htb & fq_codel in my low speed ADSL 6Mbps downlink/1 
> Mbps uplink. I use fwmark to control both uplink and downlink with good 
> results in terms of bandwidth allocation. Streaming video is chopping 
> bulk traffic successfully.
> 
> Is setting up cake worth the effort at such low speeds? Would it reduce 
> latency?
> 
> Regarding fwmark can you please elaborate more on the calculations 
> performed? Man page is not that helpful.
> 
> My understanding is this:
> 
> I use 1,2,3,4 as marks of traffic.
> If I set the mask to 0xffffff[..] the marks will remain unchanged. Then 
> right shifting will occur for the unset bits, so they will land on tins
> 1,1,3,1
> 
> Can you please correct me? If logical and performed between mask and 
> mark value?
> 
> Thanks,
> Jim
> 
> 
> 
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