[LEDE-DEV] Cake SQM killing my DIR-860L - was: [17.01] Kernel: bump to 4.4.51

[Weedy]

On 1 March 2017 at 17:40, Weedy <weedy2887 at gmail.com> wrote:
> On 28 February 2017 at 05:40, Martin Tippmann <mt at i3o.de> wrote:
>> On Mon, Feb 27, 2017 at 9:17 PM, Stijn Segers
>> <francesco.borromini at inventati.org> wrote:
>>> Okay, so I tracked it down to cake being the culprit. When I disable the
>>> Cake SQM instance, no more of those traces, and no more sudden reboots.
>>>
>>> If I can help debug this, let me know - I enabled a Cake SQM instance on an
>>> APU2 and so far that seems to run fine.
>>
>> cake: Maybe it's related - I'm seeing high cpu usage with cake on
>> TP-Link 841N routers even with none, moderate traffic after a while. I
>> don't see hanging tasks in the logs but the system feels sluggish even
>> it's idle.
>
>
> I have a WR842ND v2, I'm also seeing high CPU suddenly with only
> default fq-codel on 4.4.50.
> Are you able to git bisect? This particular device is installed in a
> remote location so I can't deal with it for a while.
>
>  >pppoe-wan                    │ 494.90KiB    351 pps     │  12.13KiB    192 pps
>
> Mem: 19620K used, 8308K free, 4K shrd, 864K buff, 1472K cached
> CPU:   1% usr  93% sys   0% nic   0% idle   0% io   0% irq   4% sirq
> Load average: 6.89 4.88 2.96 5/58 9906
>   PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
>  1555     1 root     R     1948   7%  16% /usr/sbin/hostapd -s -P /var/run/wifi
>    97     2 root     SW       0   0%  12% [kworker/0:1]
>   440     1 root     S     1180   4%   7% /sbin/ubusd
>  9165  8584 root     R     1196   4%   5% top -d3
>   840     1 root     S     1396   5%   5% /usr/sbin/odhcpd
>  9886  9883 root     R     1224   4%   4% /bin/sh /etc/netCheck.sh
>     3     2 root     SW       0   0%   4% [ksoftirqd/0]
>   104     2 root     SW       0   0%   2% [kswapd0]
>
> On the other hand, here is my WDR4300
>
>  >pppoe-wan                    │ 420.29KiB   1.69K pps    │  78.09KiB
>  1.10K pps
>
> Mem: 21212K used, 6716K free, 12K shrd, 792K buff, 1584K cached
> CPU:   6% usr  88% sys   0% nic   0% idle   0% io   0% irq   5% sirq
> Load average: 3.38 2.13 1.16 1/56 9259
>   PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
>    97     2 root     RW       0   0%  18% [kworker/0:1]
>  1555     1 root     S     1948   7%  12% /usr/sbin/hostapd -s -P /var/run/wifi
>  2714  2713 root     R     2484   9%   4% /usr/sbin/bmon -p ppp*
>  9240  9239 root     S     1184   4%   4% /bin/ping -W 3 -c 6 -q -I pppoe-wan g
>   840     1 root     S     1396   5%   4% /usr/sbin/odhcpd
>     3     2 root     SW       0   0%   4% [ksoftirqd/0]
>  9241  9239 root     S     1204   4%   3% awk /packets received  {print $4}
>  9165  8584 root     R     1188   4%   3% top -d3
>  2389     1 dnsmasq  S     1412   5%   2% /usr/sbin/dnsmasq -C /var/etc/dnsmasq

Crap wrong paste, both of those top excerpts are from my WR842ND at
about 550pps.
But choking on sys usage.

HERE is my WDR4300, moving over 2000pps with basically no sys usage.

Mem: 42960K used, 17456K free, 216K shrd, 3084K buff, 9716K cached
CPU:   5% usr   1% sys   0% nic  79% idle   0% io   0% irq  14% sirq
Load average: 0.14 0.13 0.13 1/59 7749
  PID  PPID USER     STAT   VSZ %VSZ %CPU COMMAND
 2365     1 nobody   R     5260   9%   4% /usr/sbin/darkstat --verbose -i br-la
 2297  2295 root     S     2408   4%   3% /usr/sbin/bmon -p ppp*
    3     2 root     RW       0   0%   1% [ksoftirqd/0]
 2548  2536 root     R     1188   2%   1% top -d3
 2229   995 root     S     1132   2%   0% /usr/sbin/dropbear -F -P /var/run/dro
20388     2 root     SW       0   0%   0% [kworker/0:0]

 >pppoe-wan                    │ 420.29KiB   1.69K pps    │  78.09KiB
 1.10K pps