netdev - Re: [RFC v2] fq_codel : interval servo on hosts

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Date:	Tue, 04 Sep 2012 18:57:29 +0200
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Dave Taht <dave.taht@...il.com>
Cc:	Nandita Dukkipati <nanditad@...gle.com>,
	Yuchung Cheng <ycheng@...gle.com>, codel@...ts.bufferbloat.net,
	Kathleen Nichols <nichols@...lere.com>,
	netdev <netdev@...r.kernel.org>, Tomas Hruby <thruby@...gle.com>
Subject: Re: [RFC v2] fq_codel : interval servo on hosts

On Tue, 2012-09-04 at 09:40 -0700, Dave Taht wrote:

> fq_codel has a standing queue problem, based on the fact that when a
> queue empties, codel.h resets. This made sense for the single FIFO
> codel but not multi-queued fq_codel. So after we hit X high rate
> flows, target can never be achieved, even straining mightily, and we
> end up with a standing queue again.
> 
> Easily seen with like 150 bidirectional flows at 10 or 100Mbit.
> 
> (as queues go, it's still pretty good queue. And: I've fiddled with
> various means of draining multi-queue behavior thus far, and they
> ended up unstable/unfair)

No idea of what you mean by "codel.h resets".

Please use small mails, one idea by mail.



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