Re: [Cake] cake separate qos for lan

[Allan Pinto <allan316@gmail.com>]

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>tc qdisc replace dev imq0 root handle 2: cake raw bandwidth $NONCACHE_RATE
flows
here imq0 should be replaced by ifb0 right?.
i will be testing this tonight and reply with results.

On Mon, Mar 28, 2016 at 4:01 PM, Jonathan Morton <chromatix99@gmail.com>
wrote:

>
> > On 27 Mar, 2016, at 11:20, moeller0 <moeller0@gmx.de> wrote:
> >
> > it might be more future-proof to just use IFBs from the get-go
>
> For this particular use-case, it seems to be more complicated to use IFB
> than IMQ, largely because there is no iptables rule to divert packets
> through an IFB device, and unlike iptables, the CBQ filter mechanism
> doesn’t directly support negative matches of any kind.
>
> However, I think this would work - though it’s completely untested:
>
> ip link set ifb0 up
>
> tc qdisc replace dev ppp0 root handle 1: cake pppoe-vcmux bandwidth
> $FULL_RATE triple-isolate
>
> tc qdisc replace dev imq0 root handle 2: cake raw bandwidth $NONCACHE_RATE
> flows
>
> tc filter replace dev ppp0 protocol ip prio 1 handle 11 u32 match ip src
> $CACHE_IP/32
>
> tc filter replace dev ppp0 protocol ip prio 2 handle 12 u32 action mirred
> egress redirect dev ifb0
>
> The logic of the above is that a positive match is made on the cache
> traffic, but no action is taken.  This terminates filter processing for
> that traffic.  The remaining traffic is redirected unconditionally to the
> IFB device by the second filter rule.
>
> One thing I’m not entirely certain of is whether traffic that has been
> through an IFB device is then requeued in the normal way on the original
> device.  I’d appreciate feedback on whether this system does in fact work.
>
> > I would respectfully recommend to avoid the symbolic overhead parameters
>
> Even if I change their underlying behaviour in the future, it’ll be in a
> way that retains backwards compatibility with all the examples I’ve given
> for the current scheme.  I mostly wanted to raise awareness that the
> overhead compensation system exists for use on encapsulated links.
>
>  - Jonathan Morton
>
>


-- 
Thanx and regd's.

Allan.

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