Artūras Šlajus wrote:
Hello,
I'm having such problem with HFSC with following config:
+ tc qdisc del dev eth3 root
+ tc qdisc add dev eth3 root handle 1: hfsc default 2
+ tc class add dev eth3 parent 1: classid 1:1 hfsc ls rate 512kbit ul
rate 512kbit
+ tc class add dev eth3 parent 1:1 classid 1:2 hfsc ls rate 2kbit ul
rate 400kbit
+ tc class add dev eth3 parent 1:1 classid 1:3 hfsc ls rate 32kbit ul
rate 32kbit
+ tc class add dev eth3 parent 1:1 classid 1:4 hfsc ls rate 300kbit ul
rate 300kbit
Let's say i start to upload thru 1:3. the upper-limit applies, traffic
doesn't do up more than 4kb/s. The 1:4 is still functional, but 1:2, the
default class starts backlogging and dropping as hell:
Seems to work OK for me - are you saying that there is traffic using
default but no backlog until you use 1:3?
class hfsc 1: root
Sent 0 bytes 0 pkts (dropped 0, overlimits 0)
period 0 level 2
class hfsc 1:1 parent 1: ls m1 0bit d 0us m2 512000bit ul m1 0bit d 0us
m2 512000bit
Sent 0 bytes 0 pkts (dropped 0, overlimits 0) <-- This is weird too ^_^
period 2643 work 821712 bytes level 1
You need to do a tc -s qdisc ls to get the overlimits counter for 1:0.
class hfsc 1:2 parent 1:1 ls m1 0bit d 0us m2 2000bit ul m1 0bit d 0us
m2 400000bit
Sent 477205 bytes 3874 pkts (dropped 0, overlimits 0)
backlog 201p <-- HUH? (it goes even to 800p..1000p then it starts
dropping)
period 2494 work 456595 bytes level 0
Remember arp will end up stuck here too unless you filter it elsewhere.
If you want to make the queue shorter add a p/b fifo or something and
specify limit.
class hfsc 1:3 parent 1:1 ls m1 0bit d 0us m2 32000bit ul m1 0bit d 0us
m2 32000bit
Sent 350599 bytes 558 pkts (dropped 0, overlimits 0)
backlog 11p
period 70 work 342761 bytes level 0
class hfsc 1:4 parent 1:1 ls m1 0bit d 0us m2 300000bit ul m1 0bit d 0us
m2 300000bit
Sent 22356 bytes 214 pkts (dropped 0, overlimits 0)
period 212 work 22356 bytes level 0
The 1:1 shows no packets sent as you see.. Is this desirable behavior?
The default class kinda becomes unusable. Can someone explain me such
behavior?
This is normal Patrick said in a recent post -
"HFSC doesn't update statistics of upper classes because I didn't want to
walk up the entire heirarchy for each packet just for statistics."
Andy.
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