[Cake] Cake not more CPU efficient than HTB+FQ-CoDel (anymore)?

Toke Høiland-Jørgensen toke at toke.dk
Thu Apr 12 06:48:27 EDT 2018

Toke Høiland-Jørgensen <toke at toke.dk> writes:

> Jonathan Morton <chromatix99 at gmail.com> writes:
>>> On 11 Apr, 2018, at 6:24 pm, Toke Høiland-Jørgensen <toke at toke.dk> wrote:
>>> So, um, did we cram so many features into Cake that it no longer uses
>>> less CPU? Can anyone confirm these results?
>> To be sure about this, it seems wise to configure Cake to turn off as
>> many of the new features as possible. That means selecting "besteffort
>> flows nonat" mode at least.
>> I forget whether simplest.qos correctly uses the built-in shaper with
>> Cake, rather than just layering it with HTB as usual. If not, then of
>> course Cake will use more CPU, and we should be grateful that it's by
>> a relatively small margin (maybe 15%).
> It is definitely using Cake as the shaper; in besteffort mode, but with
> nat and triple-isolation enabled I think. I'll run another test tomorrow
> with those disabled.
>> There's also a minor complication in that Cake and fq_codel behave
>> differently when handed superpackets. A fair comparison requires
>> switching aggregation modes off for both of them.
> I *think* offloads were turned off for those tests; but I'll double
> check... Also would be nice to get a measure of the smoothness of the
> shaper; will see if I can't extract that from a pcap file or
> something...

Right, double checked and ran a few more tests. Setting cake to
flowblind mode help somewhat, but HTB/FQ-CoDel still gets higher
throughput. Graph attached.


-------------- next part --------------
A non-text attachment was scrubbed...
Name: cake-vs-fqcodel-cpulimit-moretests.pdf
Type: application/pdf
Size: 115775 bytes
Desc: not available
URL: <https://lists.bufferbloat.net/pipermail/cake/attachments/20180412/9ee157a2/attachment-0001.pdf>

More information about the Cake mailing list