On Tue, Sep 19, 2000 at 12:34:31PM +0200, Ramón Agüero wrote:
> Hi all,
>
> I'm working within an application which creates packets and sends them.
> To accomplish this I use the dev_queue_xmit function. At a fist stage,
> everything runs OK, but I would like also to give priority to these messages,
> in relation with other messages that the machine creates, so that they don't
> have to wait.
>
> I would be pleased if you could tell me how to assign this priority. I'm
> working with 2.2.14 kernel.
>
You can set skb->priority to values between 0 and 15
(see include/linux/pkt_sched.h)
What actually happens depends on the queueing discipline that is set for
the interface. The default one uses a 3 way pfifo, which maps 6 and 7
to the highest priority queue.
Usually this scheduling does not help much though, because the underlying
devices have a longer queue itself where the priorities are ignored
(e.g. bus mastering ethernet cards with big TX rings or worse a modem
that does v.42bis)
-Andi
--
This is like TV. I don't like TV.
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