[ovs-discuss] QoS in OVS compared to tc

[Syed Akbar Mehdi]

Hi,

The description of the QoS tables in the Open vSwitch configuration database
(http://openvswitch.org/ovs-vswitchd.conf.db.5.pdf manual on page 21-22)
refers to the documentation of the Linux hierarchy token bucket classifier
at http://luxik.cdi.cz/~devik/qos/htb/manual/userg.htm.

However if I configure the Linux-htb classifier using tc, I get the option
to configure qdiscs and classes in a "hierarchy" which allows fine-grained
tuning of QoS policies e.g. excess-bandwidth sharing (or not sharing)
between different classes. The OVS documentation gives the impression that
this hierarchical configuration is not possible when configuring queues
using OVS (e.g. using ovs-vsctl). It appears that I can only configure
queues in a "flat" configuration where all queues are at the same level. Is
this true? In case it is then what is the policy for excess bandwidth
sharing between different queues.

Regards,
Akbar
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