netdev - Re: [PATCH 4/6] pkt_sched: Add qdisc->ops->peek() implementation.

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Message-ID: <20081016125413.GB20302@ff.dom.local>
Date:	Thu, 16 Oct 2008 12:54:13 +0000
From:	Jarek Poplawski <jarkao2@...il.com>
To:	Patrick McHardy <kaber@...sh.net>
Cc:	David Miller <davem@...emloft.net>, netdev@...r.kernel.org,
	Herbert Xu <herbert@...dor.apana.org.au>
Subject: Re: [PATCH 4/6] pkt_sched: Add qdisc->ops->peek() implementation.

On Thu, Oct 16, 2008 at 02:26:33PM +0200, Patrick McHardy wrote:
> Jarek Poplawski wrote:
>> Add qdisc->ops->peek() implementation for work-conserving qdiscs.
>>
>> diff --git a/net/sched/sch_multiq.c b/net/sched/sch_multiq.c
>> index 915f314..155648d 100644
>> --- a/net/sched/sch_multiq.c
>> +++ b/net/sched/sch_multiq.c
>
> I haven't looked at sch_multiq in detail yet, but isn't it supposed to
> be used as root qdisc? In that case we wouldn't need a ->peek operation.
>

It's recommended, but IMHO, could be useful as a child too, especially
for testing. I've thought if it shouldn't be rather treated as non-work-
conserving, but I don't think there is a reason for preventing such test
or other non-optimal usage.

>> diff --git a/net/sched/sch_teql.c b/net/sched/sch_teql.c
>> index d35ef05..8d7acd8 100644
>> --- a/net/sched/sch_teql.c
>> +++ b/net/sched/sch_teql.c
>
> teql is also meant to be used as root qdisc. It doesn't seem to enfore
> it though.

Probably like above: there is not much of this code, but it could be
cut, no problem.

Jarek P.
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