netdev - Re: [Question]The benefit of weight_p in __qdisc

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Message-ID: <54914AEC.7070600@redhat.com>
Date:	Wed, 17 Dec 2014 10:20:44 +0100
From:	Daniel Borkmann <dborkman@...hat.com>
To:	Dennis Chen <kernel.org.gnu@...il.com>
CC:	netdev@...r.kernel.org
Subject: Re: [Question]The benefit of weight_p in __qdisc_run

On 12/17/2014 09:54 AM, Dennis Chen wrote:
> weight_p is used as the burst xmit packet quota in the while loop of
> the __qdisc_run function,
> does anybody can elaborate the benefit of the weight_p introduced
> here? what's the consequence without it?

It acts as a quota to introduce fairness among qdiscs. See also slide 7
onwards for experiments with/without it:

   http://vger.kernel.org/netconf2011_slides/jamal_netconf2011.pdf
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