[LARTC] For a root-qdisc, can the bandwidth be smaller than the bandwidth of the device？

[Martin A. Brown]

 : > For a root-qdisc, can the bandwidth be smaller than the bandwidth of
 : > the device
 :
 : yes.  The root qdisc bandwidth *should* be set smaller than the
 : bandwidth of the device by about 5%

Well, wouldn't you say it depends on the qdisc in use?  If you are using
CBQ, see the comments in section 9.5.4, "The famous CBQ qdisc":

  http://lartc.org/howto/lartc.qdisc.classful.html

In short, you'll use the bandwidth parameter to both your "tc qdisc add"
and your "tc class add" commands.

But, if you are using HTB, Steve is partly correct.  Under HTB, you do not
specify the real device bandwidth, but rather the rate to which you wish
to limit your transmitted traffic.  And in this case, it is wise to set
the rate a bit lower than the real bandwidth to ensure that the HTB
qdisc/classes are the bottleneck between the networks.

-Martin

-- 
Martin A. Brown --- SecurePipe, Inc. --- mabrown@securepipe.com