Re: [Fwd: [LARTC] quantum value for voip]

[Victor Cassar <victorcassar@yahoo.com>]

Tnx Mathieu

I will try with pfifo, my voice traffic can be marked
with diffserv from the source device, so i´ll try to
take advantage of this marked traffic

regards


--- Mathieu Deziel <mathieu.deziel@crc.ca> wrote:
> Hi Victor,  see below.
> 
> >
> > >Why not a simple fifo?  You can adapt the size of
> it
> > >from the command line.
> 
> > I want tu use this pfifo queue i know its
> hardwired
> > and that i need to mark packets here or from the
> > source
> > in order to use dscp field
> >
> 
> The pfifo and bfifo qdiscs are not "hardwired". 
> Their size is configurable (specified in bytes for
> the bfifo, and in number of packets for the pfifo). 
> The one that is hardwired is the pfifo_fast:  it is
> the default qdisc, the one that is there when you
> don't configure anything.  The pfifo_fast has 3
> internal prio
> queues.  Packets are classified in one of the three
> prio queue according to the dscp mark, just like you
> said in you previous mail.  Yes, to make use of the
> priority capability of pfifo_fast, your packets must
> marked before they enter the tc software.  You can
> use iptables to mark the packets before they enter
> tc.
> 
> Another thing you can do it make use of the prio
> qdisc, and then create your own (u32) filters.  You
> can then mark the packets with dsmark before the
> packets go out, if you want.
> 
> Hope this helps,
> Mathieu.
> 


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