netdev - Re: fq_codel with 802.15.4 6LoWPAN fragmentation issue

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Message-ID: <1421413456.11734.125.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Fri, 16 Jan 2015 05:04:16 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Alexander Aring <alex.aring@...il.com>
Cc:	netdev@...r.kernel.org, linux-wpan@...r.kernel.org,
	stephen@...workplumber.org, jukka.rissanen@...ux.intel.com
Subject: Re: fq_codel with 802.15.4 6LoWPAN fragmentation issue

On Fri, 2015-01-16 at 05:00 -0800, Eric Dumazet wrote:
> On Fri, 2015-01-16 at 04:57 -0800, Eric Dumazet wrote:
> >  example :
> > 
> 
> Sorry, one keyword was missing :
> 
> tc qdisc replace dev lowpan0 root fq_codel interval XXX
> 

But the parameter that you probably want to change is not the interval.
It is probably the target :

tc qdisc replace dev lowpan0 root fq_codel interval 200ms target 25ms

Now, if the fragmentation was done after qdisc dequeue, as in GSO layer,
you would not have this issue : all segments of one ipv6 message would
be transmitted, no matter what.


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