netdev - Re: AW: RFC: replace packets already in queue

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Message-ID: <1341214310.5269.27.camel@edumazet-glaptop>
Date:	Mon, 02 Jul 2012 09:31:50 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	"Erdt, Ralph" <ralph.erdt@...e.fraunhofer.de>
Cc:	Rick Jones <rick.jones2@...com>,
	"netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: AW: RFC: replace packets already in queue

On Mon, 2012-07-02 at 07:02 +0000, Erdt, Ralph wrote:

> Even if the wireless queue is a problem (because of our setup, this is
> not a problem), the network stack queue (*) is the biggest queue, and
> a good point to optimize. 

Hmm, I am not convinced you have no queues on wireless.

Please describe how you managed this.

In fact this is the biggest problem with wireless : mac82011 framework
aggressively pull packets from Linux packet qdisc in order to perform
packet aggregation.

Most packets don't stay in qdisc but are sitting in wireless driver,
unless you really flood it. If it happens, you already are in trouble.

So code your qdisc thing, but I am not sure you'll get much improvement.
You would need to implement it in wireless code instead.

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