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Date:      Sun, 29 Jun 2014 12:16:30 -0400
From:      Allan Jude <allanjude@freebsd.org>
To:        freebsd-hackers@freebsd.org
Subject:   Re: ipfw pipe config bw tun0
Message-ID:  <53B03BDE.8020302@freebsd.org>
In-Reply-To: <CA%2BhQ2%2BgREg_L4Ar021EOSjcc9xPOPinpDeTefpP0B4zz4%2B0_Nw@mail.gmail.com>
References:  <alpine.BSF.2.00.1406291615530.88662@wojtek.tensor.gdynia.pl> <CA%2BhQ2%2BgREg_L4Ar021EOSjcc9xPOPinpDeTefpP0B4zz4%2B0_Nw@mail.gmail.com>

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On 2014-06-29 10:52, Luigi Rizzo wrote:
> On Sun, Jun 29, 2014 at 4:16 PM, Wojciech Puchar <
> wojtek@wojtek.tensor.gdynia.pl> wrote:
>=20
>> i tried to use ipfw dummynet as described in manual
>>
>> ---
>> If a device name is specified instead of a numeric value, as in
>>
>>                    ipfw pipe 1 config bw tun0
>>
>>              then the transmit clock is supplied by the specified devi=
ce.
>> At
>>              the moment only the tun(4) device supports this functiona=
lity,
>>              for use in conjunction with ppp(8).
>>
>> ----
>>
>>
>> got "no if support" error message. what i missed?
>>
>=20
> you missed =E2=80=8Bnothing -- it's just that no device that i know
> of still implements the feature.
> i implemented it 15 years ago and enabled it on the 'ed'
> device driver only.
>=20
> What it needed is a notification on the transmit
> interrupt to kick the pipe and tell it how many
> packets went out (at the time 'ed' only supported
> one packet at a time, so the code might make
> assumptions).=E2=80=8B
>=20
> It might need a bit of redesign these days to make it
> work efficiently with fast pipes and deep interface queues.
>=20
> cheers
> luigi
> _______________________________________________
> freebsd-hackers@freebsd.org mailing list
> http://lists.freebsd.org/mailman/listinfo/freebsd-hackers
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rg"
>=20

If you check out the IPFW article in the FreeBSD Journal May/June issue,
I have some better examples. When I get time I'll work similar examples
into the handbook and maybe the man page.

--=20
Allan Jude


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