[LARTC] Re: dropped bytes in "tc -s class" output

[Christian Benvenuti <christian.benvenuti@libero.it>]

Hi,

>Hi All
>
>Is there any output that counts the number of dropped bytes
>(not packets) just as in "Sent" in "tc -s class" output?

No.
A simple workaround (for simple configurations) consists of redirecting
all the traffic you want to drop to a dedicated class and attach a
blackhole qdisc (i.e., drop everything) to it.

Supposing you redirect to class 1:12 all the traffic that is to be
dropped, all you need is:

        tc qdisc add dev eth1 parent 1:12 handle 12: blackhole

The counters of class 1:12 are what you are looking for:

class htb 1:12 parent 1:1 leaf 12: prio 0 quantum 1600 rate 128000bit
ceil 128000bit burst 1664b/8 mpu 0b overhead 0b cburst 1664b/8 mpu 0b
overhead 0b level 0
 Sent 2352 bytes 24 pkt (dropped 0, overlimits 0 requeues 0)
 ^^^^^^^^^^^^^^^^^^^^^^

qdisc blackhole 12: dev eth1 parent 1:12
 Sent 0 bytes 0 pkt (dropped 24, overlimits 0 requeues 0)
                     ^^^^^^^^^^

>I have an HTB arrangement here I can see "dropped" in father/mother 1:0
qdisc
>but NOT in each class (they are all zeroes).
>These dropped are packets or bytes? 

Number of packets.

>Why these "drops" do not show thenselves in its own class(es) under its
>qdisc?
>
>Any patch perhaps??
>Regards

Regards
/Christian
[http://benve.info]



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