Re: ipfw pipe config bw tun0

We can start adding that. How should it behave for multi-queue devices?

-a

On 29 June 2014 07:52, Luigi Rizzo <rizzo@iet.unipi.it> wrote:
> On Sun, Jun 29, 2014 at 4:16 PM, Wojciech Puchar <
> wojtek@wojtek.tensor.gdynia.pl> wrote:
>
>> 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 device.
>> At
>>              the moment only the tun(4) device supports this functionality,
>>              for use in conjunction with ppp(8).
>>
>> ----
>>
>>
>> got "no if support" error message. what i missed?
>>
>
> you missed nothing -- 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.
>
> 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).
>
> It might need a bit of redesign these days to make it
> work efficiently with fast pipes and deep interface queues.
>
> cheers
> luigi
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