netdev - Re: qstats update in packet scheduling

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Message-ID: <1416850289.17888.67.camel@edumazet-glaptop2.roam.corp.google.com>
Date:	Mon, 24 Nov 2014 09:31:29 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Josh Clark <jcinma@...il.com>
Cc:	netdev <netdev@...r.kernel.org>
Subject: Re: qstats update in packet scheduling

On Mon, 2014-11-24 at 12:06 -0500, Josh Clark wrote:
> Hi everyone,
> 
> I'm working on a research project to add some extra functionality to
> RED. Right now, I'm tracking qstats to look at the factors that RED
> uses to calculate marking probability. Using standard RED with printk
> debug statements, I'm seeing that there are some drops, but no change
> in qlen or backlog when I send 12Mbps through a 10Mbps link.
> 
> Does RED use some other means to update qstats and track backlog, or
> do I need to change how I'm sending the test traffic though?

With steady traffic, there is no reason qlen should vary.

It should reach some equilibrium as well.


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