[Cake] Cake performance optimization

Sebastian Moeller moeller0 at gmx.de
Mon Nov 23 06:16:46 EST 2015

Hi Vincent,

On Nov 23, 2015, at 10:50 , Vincent Frentzel <vincent at frentzel.eu> wrote:

> Sounds encouraging. Just a note/thought... I am actually not running ingress through the IFB. I set the download speed to 0 and perform egress shaping on the lan bridge iface (br-lan).

	Not a bad idea, this gets rid of to challenges at once: the fact that redirection through an IFB is not computationally free and the fact that the ingress packets in the IFB are pre-NAT (as seen from outside) and will not allow to use simple filtering based on internal IP or MAC addresses. I am also happy to hear that shaping on the bridge works…

Best Regards

> Maybe not the lightest setup, but this gives a really high flexiblity to classify the ingress traffic (ie. I dont have to use best effort nor trust the incoming DSCPs which are anyway tweaked by my provider).
> On x86_64 I agree with your observation, no speed problem there. But running a 1.83 Ghz box for routing 4 devices is a tad overkill :)
> I use the connmark stuff to reclass tcp streaming traffic from CS0 to AF4x and udp traffic to EF (Netflix/Youtube and Voip respectively). I also apply priority to DNS (AF4x), NTP (EF), SSH (AF4x) and deprioritize some traffic to CS1. I do this in my firewall3 config and firewall.user (some of my rules are MAC based -> chromecast, nas box, etc..). I set the mark and connmark save it on egress, on ingress (egress of the other iface) I simply restore the mark. In an ideal world... all apps would apply meaningful DSCPs to their packets and this classification would not be needed. In general, I tend to trust the DSCPs on egress and dont override them, on ingress I squash everything. 
> I used to run htb + fq_codel and performance was awful, cake performs *much* better.
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