netdev - Re: qstats update in packet scheduling

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Message-ID: <CAHmvzZTF76DwdyBF9og2v9Vumx5v0BhHR584uX54o5R+T+iUMw@mail.gmail.com>
Date:	Mon, 24 Nov 2014 14:14:12 -0500
From:	Josh Clark <jcinma@...il.com>
To:	Dave Taht <dave.taht@...il.com>
Cc:	Eric Dumazet <eric.dumazet@...il.com>,
	netdev <netdev@...r.kernel.org>
Subject: Re: qstats update in packet scheduling

On Mon, Nov 24, 2014 at 2:01 PM, Dave Taht <dave.taht@...il.com> wrote:
> On Mon, Nov 24, 2014 at 10:42 AM, Eric Dumazet <eric.dumazet@...il.com> wrote:
>> On Mon, 2014-11-24 at 13:17 -0500, Josh Clark wrote:
>>
>>> But I'm seeing no change at all in qlen. qlen and backlog are both
>>> zero, which results in zero qavg, meaning I can't test the RED
>>> functionality at all.
>>
>> Wait. If you use some kernel patch without giving it, I can not comment.
>>
>> If you use regular "tc -s qdisc ...", then you'll see non zero qlen
>
> Well, assuming you have BQL or a software rate limiter in place in
> front of it...
>
At the moment, I'm using standard RED (from /net/sched/sch_red.c) with
some printks to output qstats.
Are you saying that when I set this up, I need to use the -s flag in
tc to maintain those statistics?

One more question: if I don't use -s, then what would RED use to calculate qavg?

>>
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>
>
> --
> Dave Täht
>
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