I am of course, always interested in more folk dumping hfsc and complicated designs, and trying sch_cake.... On Fri, Dec 28, 2018 at 3:54 AM Alan Goodman <notifications@xxxxxxxxxxxxxxxxxxxxxxxx> wrote: > > Perhaps you should post an example of your tc setup? > > I had a bug a few months back where traffic in important queues would > seemingly randomly get 100% drop rate (as in your example below). Upon > penning an email with the tc setup I realised that I had a leaf class on > the wrong branch and was trying to guarantee 99.9+% of traffic for that > leaf if it had significant traffic... Number 1:2 was swapped for number > 1:1 and everything went back to normal. > > Alan > > On 27/12/2018 22:26, Grzegorz Gwóźdź wrote: > > > >> Are there any "hacks" in TC allowing to look in the guts? > >> > >> It looks like it's changing state to "clogged" but > >> > >> tc -s class ls dev eth0 > >> > >> looks completely normal (only grows number of sfq queues created > >> dynamically for every connection since more and more connections are > >> created but not closed) > > > > > > In fact i've noticed something interesting during "clugged" state... > > > > a few runs of: > > > > tc -s class ls dev eth0 > > > > shows that filters sort packets well but packets that goes into > > suitable classes are dropped: > > > > class hfsc 1:1012 parent 1: leaf 1012: sc m1 6144Kbit d 10.0s m2 > > 4096Kbit ul m1 6144Kbit d 10.0s m2 4096Kbit > > Sent 103306048 bytes 75008 pkt (dropped 12, overlimits 0 requeues 0) > > backlog 39Kb 127p requeues 0 > > period 13718 work 103306048 bytes rtwork 103306048 bytes level 0 > > > > and after a while: > > > > class hfsc 1:1012 parent 1: leaf 1012: sc m1 6144Kbit d 10.0s m2 > > 4096Kbit ul m1 6144Kbit d 10.0s m2 4096Kbit > > Sent 103306048 bytes 75008 pkt (dropped 116, overlimits 0 requeues 0) > > backlog 39160b 127p requeues 0 > > period 13718 work 103306048 bytes rtwork 103306048 bytes level 0 > > > > "Sent" stands still and all packets are "dropped" > > > > Some classes passes packets but as time goes by more and more classes > > stops passing and starts dropping. > > > > > > GG > > -- Dave Täht CTO, TekLibre, LLC http://www.teklibre.com Tel: 1-831-205-9740
