Re: [Bloat] tc -s qdisc questions

[Dave Taht <dave.taht@gmail.com>]

On Thu, May 14, 2015 at 3:22 PM, Kevin Darbyshire-Bryant
<kevin@darbyshire-bryant.me.uk> wrote:
> Hi Chaps,
>
> Further to Dave's recent request for 'tc -s qdisc' stats looking at drops vs
> ecn marks, please could someone take a look at these and explain to this
> idiot quite what is going on?  This is a particularly slow & ratty ADSL line
> providing my parents internet 'service'.  Before I got hold of it with
> OpenWrt CC trunk + cake jammed in it, 6 seconds of bufferbloat was not
> uncommon.  I'm using the default sqm scripts that arrive with the
> 'ceropackages' repo (used as a source of patched iproute2, cake, etc)  In
> essence 2 questions: 1) Why no ECN marks, only drops?

http://www.bufferbloat.net/projects/cerowrt/wiki/Enable_ECN

> 2) What falls into
> diffserv class 0 (alias, why has nothing used it?)

depends.
>
> Your time, patience etc is greatly appreciated.
>
> Kevin
>
> root@Router:~# tc -s qdisc show dev pppoa-wan
> qdisc cake 803a: root refcnt 2 bandwidth 256Kbit diffserv4 flows
>  Sent 1928303 bytes 12121 pkt (dropped 73, overlimits 6915 requeues 0)
>  backlog 0b 0p requeues 0
>            Class 0     Class 1     Class 2     Class 3
>   rate       256Kbit     240Kbit     192Kbit      64Kbit
>   target      70.5ms      75.2ms      94.0ms     282.0ms
> interval     564.0ms     601.6ms     752.0ms        2.3s
> Pk delay         0us      91.4ms      17.5ms       3.2ms
> Av delay         0us       2.9ms       2.9ms        53us
> Sp delay         0us         5us       136us         7us
>   pkts             0       11754         408          32
> way inds           0           0           0           0
> way miss           0         347         404           5
> way cols           0           0           0           0
>   bytes            0     1973100       28163        6537
>   drops            0          73           0           0
>   marks            0           0           0           0
> qdisc ingress ffff: parent ffff:fff1 ----------------
>  Sent 8221609 bytes 11969 pkt (dropped 6, overlimits 0 requeues 0)
>  backlog 0b 0p requeues 0
> root@Router:~# tc -s qdisc show dev ifb4pppoa-wan
> qdisc cake 803b: root refcnt 2 bandwidth 1512Kbit besteffort flows
>  Sent 7597496 bytes 11494 pkt (dropped 482, overlimits 10487 requeues 0)
>  backlog 0b 0p requeues 0
>            Class 0
>   rate      1512Kbit
>   target      12.0ms
> interval     112.0ms
> Pk delay       3.3ms
> Av delay       289us
> Sp delay         5us
>   pkts         11976
> way inds           0
> way miss         769
> way cols           0
>   bytes      8270163
>   drops          482
>   marks            0
>
>
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-- 
Dave Täht
Open Networking needs **Open Source Hardware**

https://plus.google.com/u/0/+EricRaymond/posts/JqxCe2pFr67