netdev - Re: [RFC PATCH] sched: Fix resource limiting in pfifo

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Date:	Sun, 30 Aug 2009 14:16:13 +0530
From:	Krishna Kumar2 <krkumar2@...ibm.com>
To:	Jarek Poplawski <jarkao2@...il.com>
Cc:	davem@...emloft.net, Eric Dumazet <eric.dumazet@...il.com>,
	netdev@...r.kernel.org
Subject: Re: [RFC PATCH] sched: Fix resource limiting in pfifo_fast

> Jarek Poplawski <jarkao2@...il.com>
> >> pfifo_fast_enqueue has this check:
> >>         if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) {
> >>
> >> which allows each band to enqueue upto tx_queue_len skbs for a
> >> total of 3*tx_queue_len skbs. I am not sure if this was the
> >> intention of limiting in qdisc.
> >
> > Yes I noticed that and said to myself :
> > This was to let high priority packets have their own limit,
> > independent on fact that low priority packets filled their queue.
>
>
> Good point, but then logically it could be something like:
>   if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len / 3)
>
> Of course, there is a backward compatibility question, plus
> an sch_prio consistency question.

Jarek, what is the consistency problem?

Thanks,

- KK

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