Re: altq for vlans?
From: Gilbert Tsang (gtsang_at_lnxw.com)
Date: 07/23/05
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Date: Fri, 22 Jul 2005 19:07:17 -0700 To: Max Laier <max@love2party.net>, freebsd-net@freebsd.org
I believe the solution is not patching ALTQ to the VLAN driver, but
rather make ALTQ recognize rules that classify according to fields in
Layer 2 header (fields such as VLANid and Priority, other than just
src/dst addr/port and protocol in IP header). For example, build
filter rules that specify priority tracking according to the 3-bit
field in the VLAN tag as per 802.1p.
For example in /etc/altq.conf:
interface vx0 bandwidth 100M cbq
class cbq vx0 root_class NULL pbandwidth 100
class cbq vx0 vlan1_class root_class pbandwidth 80
filter vx0 cs1_class vlan1_class vlanprio 6 # priority 6 takes
more bandwidth
class cbq vx0 vlan2_class root_class pbandwidth 15
filter vx0 cs2_class vlan2_class vlanprio 4 # priority 4 takes
less bandwidth
The discussion (patch) back then is good for a FreeBSD configured as
end-host, but not as a MAC bridge:
[1]http://lists.freebsd.org/pipermail/freebsd-net/2005-January/006240.
html
Regards, Gilbert Tsang.
Max Laier wrote:
On Sunday 13 February 2005 22:36, David Gilbert wrote:
Has anyone considered patching the vlan driver to support altq? I
gather that since tun works, so should vlan.
This should be a FAQ. Anyway, here is the story:
While you can do ALTQ queueing on vlan interfaces the usefulness of this is
very little. If the physical interface supports ALTQ it is *always* better
to do the queueing there. If the physical interface does not support ALTQ it
must be patched.
[snipped]
References
1. http://lists.freebsd.org/pipermail/freebsd-net/2005-January/006240.html
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