LARTC - Jun 2003 - FW: pfifo_fast and prio

I sent this the other day, but I must have misaddressed it since
this is my first posting to this list.

Sorry for the newbie questions.

Bibb Cain
>  -----Original Message-----
> From: 	Cain, Joseph  
> Sent:	Thursday, May 29, 2003 5:18 PM
> To:	''lartc@mailman.ds9a.nl''
> Cc:	Cain, Joseph
> Subject:	pfifo_fast and prio
> 
> A couple of quick questions about using priority queuing. I am
> doing experiments with ad hoc routing protocols and I want
> to ultimately have 3 or 4 classes of traffic. At present I am
> using the default pfifo_fast queuing discipline on the wireless
> interface with 3 classes of traffic and with a 100 packet
> buffer on the interface.
> 1) Is there a way to allocate a fixed amount of buffer space
> to each of the 3 bands with pfifo_fast? I suspect not, but I
> don''t see any documentation on this. My guess is that it is
> one big block of memory that could be filled by lower
> priority packets and reject new higher priority packets when full.
> I think we have encountered congested situations where
> higher priority traffic may be blocked because the buffer
> is full of lower priority packets. Will this be true?
> 2) I want to eventually replace this pfifo_fast queuing discipline 
> with the prio queuing discipline with 4 bands and with defined
> amounts of buffer space allocated to each band when I understand how to do
> it. The examples I have seen in the HOWTO for configuring this seem to
> indicate
> that the prio queuing discipline automatically comes up with 3 bands, but I
> didn''t see
> any examples of tc commands to configure additional bands
> or allocate buffer to the bands. Is this possible and is there 
> a tc document that provides the necessary commands?
> Or could you show me the necessary commands?
> 
> Thanks for the help.
> 
> Bibb Cain
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On Monday 02 June 2003 18:41, Cain, Joseph wrote:
> I sent this the other day, but I must have misaddressed it since
> this is my first posting to this list.
It arrived fine.  But none of the other list members had an answer on your 
questions.
> Sorry for the newbie questions.
>
> Bibb Cain
>
> >  -----Original Message-----
> > From: 	Cain, Joseph
> > Sent:	Thursday, May 29, 2003 5:18 PM
> > To:	''lartc@mailman.ds9a.nl''
> > Cc:	Cain, Joseph
> > Subject:	pfifo_fast and prio
> >
> > A couple of quick questions about using priority queuing. I am
> > doing experiments with ad hoc routing protocols and I want
> > to ultimately have 3 or 4 classes of traffic. At present I am
> > using the default pfifo_fast queuing discipline on the wireless
> > interface with 3 classes of traffic and with a 100 packet
> > buffer on the interface.
> > 1) Is there a way to allocate a fixed amount of buffer space
> > to each of the 3 bands with pfifo_fast? I suspect not, but I
> > don''t see any documentation on this. My guess is that it is
> > one big block of memory that could be filled by lower
> > priority packets and reject new higher priority packets when full.
> > I think we have encountered congested situations where
> > higher priority traffic may be blocked because the buffer
> > is full of lower priority packets. Will this be true?
> > 2) I want to eventually replace this pfifo_fast queuing discipline
> > with the prio queuing discipline with 4 bands and with defined
> > amounts of buffer space allocated to each band when I understand how
to
> > do it. The examples I have seen in the HOWTO for configuring this seem
to
> > indicate
> > that the prio queuing discipline automatically comes up with 3 bands,
but
> > I didn''t see
> > any examples of tc commands to configure additional bands
> > or allocate buffer to the bands. Is this possible and is there
> > a tc document that provides the necessary commands?
> > Or could you show me the necessary commands?
> >
> > Thanks for the help.
> >
> > Bibb Cain
>
> _______________________________________________
> LARTC mailing list / LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/mailman/listinfo/lartc HOWTO: http://lartc.org/
Stef

-- 

stef.coene@docum.org
 "Using Linux as bandwidth manager"
     http://www.docum.org/
     #lartc @ irc.oftc.net

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