[Cake] cake memory consumption

Toke Høiland-Jørgensen toke at redhat.com
Mon Sep 16 10:01:39 EDT 2019

Sebastian Gottschall <s.gottschall at newmedia-net.de> writes:

> Am 16.09.2019 um 14:08 schrieb Toke Høiland-Jørgensen:
>> Sebastian Gottschall <s.gottschall at newmedia-net.de> writes:
>>> after we found out serious out of memory issues on smaller embedded
>>> devices (128 mb ram) we made some benchmarks with different schedulers
>>> with the result that cake takes a serious amount of memory. we use the
>>> out of tree cake module and we use it class based since we have complex
>>> methods of doing qos per interface, per mac addresse or even per
>>> ip/network. so its not just simple cake on a single interface solution.
>>> we made some benchmarks with different schedulers. does anybody have a
>>> solution for making that better?
>>> HTB/FQ_CODEL ------- 62M
>>> HTB/SFQ ------- 62M
>>> HTB/PIE ------- 62M
>>> HTB/FQ_CODEL_FAST ------- 67M
>>> HTB/CAKE -------111M
>>> HFSC/FQ_CODEL_FAST ------- 47M
>>> HTB/PIE ------- 49M
>>> HTB/SFQ ------- 50M
>>> HFSC /FQ_CODEL ------- 52M
>>> HFSC/CAKE -------109M
>> How are you measuring the memory usage, and what is your full config for
>> each setup? :)
> me? nothing. i requested this test from a reporter and he uses just free 
> / top. so there is a error tollerance.

Ah, I see. So this is just total system memory as reported by top.

> but it shows a significant difference between cake and fq_codel etc. 
> cake is doing a OOM at the end
> for the full report including config screenshots see this 
> https://svn.dd-wrt.com/ticket/6798#comment:14. it shows also the qos 
> setup which i can use to reproduce and to
> print out the full tc ruleset if required (which it surelly is for you). 
> if you want i will recreate this setup and send the tc rules on this
> list

Yes, please do. The output of 'tc -s qdisc' would be useful as well to
see how much memory CAKE itself thinks it's using...

Are you setting the memory_limit in your config or relying on CAKE's


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