tbf token help

mknific@siol.net
Mon, 21 Jun 2004 10:43:22 -0000

Hi all!

I just started to experiment with bandwidth management using tbf.
I have the folowing problems with token understanding:

1) What unit is token? Is "1 token = 1 byte" ?
    If this is so, then with rate=0.5mbit and HZ=100 the bucket gets filled
    with 0,64kb (655 tokens) every 10ms?

2) How much tokens are used for one packet (1500)?

3) And token unrelated question. Does packet droping alway ocurrs or
    it happens because of bad settings?

    I have applied this settings on 10mbit ethernet card:
    tc qdisc add dev eth1 root tbf rate 0.5mbit burst 5kb latency 70ms /
    peakrate 1mbit minburst 1540

   Result:
   qdisc tbf 8007: dev eth1 rate 512Kbit burst 5Kb/8 mpu 0b peakrate 1Mbit mtu
   1539b/8 mpu 0b lat 68.4ms
   Sent 1284481 bytes 852 pkts (dropped 48, overlimits 1743)


Thanks!

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