[Cake] Cake memory usage after 1TB

[Pete Heist]

Hmm, since I see in the code that this could lead to drops, I've
restarted it and upped the limit to 16M. I haven't had reports of
widespread problems, but I'll keep an eye on this more closely. :)

Pete

On Thu, 2021-06-24 at 15:06 +0200, Pete Heist wrote:
> I'm using Cake on an EdgeRouter-X at a site that does around 50-
> 100GB/day, and we're quite happy with it so far. Egress and ingress
> stats are below after ~1TB download and ~100GB upload.
> 
> I use "memlimit 8M", and noticed that it's reporting 8389696 bytes
> used
> on egress, which is at the maximum (slightly over actually). Around
> 6M
> is used on ingress. Should I then raise these limits, or is it normal
> for it to settle in around the maximum over time?
> 
> Pete
> 
> 
> Egress:
> -------
> 
> qdisc cake 8008: dev eth4 root refcnt 2 bandwidth 8Mbit diffserv4
> dual-
> srchost nat nowash no-ack-filter split-gso rtt 100.0ms raw overhead 0
> fwmark 0xf no-sce 
>  Sent 102655686381 bytes 386831397 pkt (dropped 377557, overlimits
> 230324326 requeues 0) 
>  backlog 0b 0p requeues 0
>  memory used: 8389696b of 8Mb
>  capacity estimate: 8Mbit
>  min/max network layer size:           42 /    1514
>  min/max overhead-adjusted size:       42 /    1514
>  average network hdr offset:           14
> 
>                    Bulk  Best Effort        Video        Voice
>   thresh        500Kbit        8Mbit        4Mbit        2Mbit
>   target         36.3ms        5.0ms        5.0ms        9.1ms
>   interval      131.3ms      100.0ms      100.0ms      104.1ms
>   pk_delay       17.5ms        4.1ms        1.7ms        2.0ms
>   av_delay        4.5ms        232us         82us        382us
>   sp_delay         14us         23us          6us          7us
>   backlog            0b           0b           0b           0b
>   pkts           165781    324229040     61032588      1781545
>   bytes        45344666  98316181815   4518083349    291035866
>   way_inds           42     18492140      7782656        34167
>   way_miss         4289      6575635        77917        62650
>   way_cols            0          340            0            0
>   sce                 0            0            0            0
>   marks               7        19542            1            0
>   drops               8       377528           15            6
>   ack_drop            0            0            0            0
>   sp_flows            0            2            0            1
>   bk_flows            0            1            0            0
>   un_flows            0            0            0            0
>   max_len          1514         1514         1514         1514
>   quantum           300          300          300          300
> 
> Ingress:
> --------
> 
> qdisc cake 1: dev ifb4eth4 root refcnt 2 bandwidth 40Mbit diffserv4
> dual-dsthost nat nowash no-ack-filter split-gso rtt 100.0ms raw
> overhead 0 fwmark 0xf no-sce 
>  Sent 1081750548776 bytes 839670608 pkt (dropped 1616216, overlimits
> 657093747 requeues 0) 
>  backlog 0b 0p requeues 0
>  memory used: 6027328b of 8Mb
>  capacity estimate: 40Mbit
>  min/max network layer size:           60 /    1514
>  min/max overhead-adjusted size:       60 /    1514
>  average network hdr offset:           14
> 
>                    Bulk  Best Effort        Video        Voice
>   thresh       2500Kbit       40Mbit       20Mbit       10Mbit
>   target          7.3ms        5.0ms        5.0ms        5.0ms
>   interval      102.3ms      100.0ms      100.0ms      100.0ms
>   pk_delay        2.0ms        6.5ms        692us        1.1ms
>   av_delay        248us        2.6ms         88us        139us
>   sp_delay         12us         16us          7us          6us
>   backlog            0b           0b           0b           0b
>   pkts            29132    682090182    155330794      3836716
>   bytes        25452377 850788764602 230875228776   2357107850
>   way_inds            3     37939194     21198287        71120
>   way_miss         9448      6525310        97141        51428
>   way_cols            0          107            0            0
>   sce                 0            0            0            0
>   marks               0       206496          203           30
>   drops              30      1534636        80809          741
>   ack_drop            0            0            0            0
>   sp_flows            0            2            0            0
>   bk_flows            0            1            0            0
>   un_flows            0            0            0            0
>   max_len          1484         1514         1514         1514
>   quantum           300         1220          610          305
> 
>