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Subject: [Bloat] tc -s qdisc questions
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Hi Chaps,

Further to Dave's recent request for 'tc -s qdisc' stats looking at=20
drops vs ecn marks, please could someone take a look at these and=20
explain to this idiot quite what is going on?  This is a particularly=20
slow & ratty ADSL line providing my parents internet 'service'.  Before=20
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=20
arrive with the 'ceropackages' repo (used as a source of patched=20
iproute2, cake, etc)  In essence 2 questions: 1) Why no ECN marks, only=20
drops?  2) What falls into diffserv class 0 (alias, why has nothing used =

it?)

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


--------------000408070509030508030507
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    Hi Chaps,<br>
    <br>
    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?=C2=A0 This is a
    particularly slow &amp; ratty ADSL line providing my parents
    internet 'service'.=C2=A0 Before I got hold of it with OpenWrt CC tru=
nk +
    cake jammed in it, 6 seconds of bufferbloat was not uncommon.=C2=A0 I=
'm
    using the default sqm scripts that arrive with the 'ceropackages'
    repo (used as a source of patched iproute2, cake, etc)=C2=A0 In essen=
ce 2
    questions: 1) Why no ECN marks, only drops?=C2=A0 2) What falls into
    diffserv class 0 (alias, why has nothing used it?)<br>
    <br>
    Your time, patience etc is greatly appreciated.<br>
    <br>
    Kevin<br>
    <br>
    <font face=3D"monospace">root@Router:~# tc -s qdisc show dev pppoa-wa=
n<br>
      qdisc cake 803a: root refcnt 2 bandwidth 256Kbit diffserv4 flows <b=
r>
      =C2=A0Sent 1928303 bytes 12121 pkt (dropped 73, overlimits 6915
      requeues 0) <br>
      =C2=A0backlog 0b 0p requeues 0 <br>
      =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Class =
0=C2=A0=C2=A0=C2=A0=C2=A0 Class 1=C2=A0=C2=A0=C2=A0=C2=A0 Class 2=C2=A0=C2=
=A0=C2=A0=C2=A0 Class 3=C2=A0 <br>
      =C2=A0 rate=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 256Kbit=C2=A0=C2=A0=
=C2=A0=C2=A0 240Kbit=C2=A0=C2=A0=C2=A0=C2=A0 192Kbit=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 64Kbit<br>
      =C2=A0 target=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 70.5ms=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0 75.2ms=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 94.0ms=C2=A0=C2=A0=C2=A0=
=C2=A0 282.0ms<br>
      interval=C2=A0=C2=A0=C2=A0=C2=A0 564.0ms=C2=A0=C2=A0=C2=A0=C2=A0 60=
1.6ms=C2=A0=C2=A0=C2=A0=C2=A0 752.0ms=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 2.3s<br>
      Pk delay=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0us=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0 91.4ms=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 17.5ms=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 3.2ms<br>
      Av delay=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0us=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0 2.9ms=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 2.9=
ms=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 53us<br>
      Sp delay=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0us=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5us=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 136us=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 7us<br>
      =C2=A0 pkts=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 11754=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 408=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0 32<br>
      way inds=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0<br>
      way miss=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 347=C2=A0=C2=A0=C2=A0=C2=
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=C2=A0=C2=A0=C2=A0 5<br>
      way cols=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
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=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0<br>
      =C2=A0 bytes=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0 1973100=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
=C2=A0 28163=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 6537<br>
      =C2=A0 drops=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 73=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0<br>
      =C2=A0 marks=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=
=A0=C2=A0 0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0=C2=A0=C2=A0=
=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 0<br>
      qdisc ingress ffff: parent ffff:fff1 ---------------- <br>
      =C2=A0Sent 8221609 bytes 11969 pkt (dropped 6, overlimits 0 requeue=
s 0)
      <br>
      =C2=A0backlog 0b 0p requeues 0 <br>
      root@Router:~# tc -s qdisc show dev ifb4pppoa-wan<br>
      qdisc cake 803b: root refcnt 2 bandwidth 1512Kbit besteffort flows
      <br>
      =C2=A0Sent 7597496 bytes 11494 pkt (dropped 482, overlimits 10487
      requeues 0) <br>
      =C2=A0backlog 0b 0p requeues 0 <br>
      =C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 Class =
0=C2=A0 <br>
      =C2=A0 rate=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 1512Kbit<br>
      =C2=A0 target=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 12.0ms<br>
      interval=C2=A0=C2=A0=C2=A0=C2=A0 112.0ms<br>
      Pk delay=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 3.3ms<br>
      Av delay=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 289us<br>
      Sp delay=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 5us<br>
      =C2=A0 pkts=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 11976<b=
r>
      way inds=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 0<br>
      way miss=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 769<br>
      way cols=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=
 0<br>
      =C2=A0 bytes=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 8270163<br>
      =C2=A0 drops=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0=C2=A0 =
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