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Date:      Tue, 04 Jun 2002 08:47:13 -0700
From:      Lars Eggert <larse@ISI.EDU>
To:        Luigi Rizzo <rizzo@icir.org>
Cc:        net@FreeBSD.ORG
Subject:   Re: Dummynet WFQ
Message-ID:  <3CFCE101.3040108@isi.edu>
References:  <3CFB9BC4.9080506@isi.edu> <20020603122913.A78688@iguana.icir.org>

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Luigi Rizzo wrote:
> the signal that tell the WFQ algorithm when you can transmit the
> next packet comes from the pipe. The latter ticks either at a
> predefined rate (as configured with the 'bw NNN bit/s' parameter),
> or from the tx interrupt coming from a device (e.g. you can say
> something like 'bw ed0' to get the transmit clock from device ed0).
> 
> HOWEVER: i have implemented the necessary machinery in dummynet (it
> is a function called if_tx_rdy()) and in the user interface, "ipfw",
> but have not added the hooks to call if_tx_rdy() in each device
> driver because these calls are somewhat expensive, and you probably do not want
> them on a 100Mbit/s interface.
> 
> See http://www.geocrawler.com/archives/3/165/2002/3/0/8222181/
> on how to use them (a search for "dummynet if_tx_rdy()" should return
> some results).

I'm trying to merge this into the sis driver, which seems to batch 
transmissions together. For clarification, do you expect one if_tx_rdy() 
  call per packet or one per batch? Per packet may result in a burst of 
these calls, does dummynet handle this?

Thanks,
Lars
-- 
Lars Eggert <larse@isi.edu>           USC Information Sciences Institute

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