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From: Eric Dumazet <eric.dumazet@gmail.com>
To: Dave Taht <dave.taht@gmail.com>
Cc: Tomas Hruby <thruby@google.com>,
	Nandita Dukkipati <nanditad@google.com>,
	netdev <netdev@vger.kernel.org>,
	codel@lists.bufferbloat.net
Subject: Re: [RFC v2] fq_codel : interval servo on hosts
Date: Tue, 04 Sep 2012 18:57:29 +0200	[thread overview]
Message-ID: <1346777849.13121.50.camel@edumazet-glaptop> (raw)
In-Reply-To: <CAA93jw6k4pgwanTa81oHb8jV6WGMfoo6KuOBSjbrfU3eRMbt5A@mail.gmail.com>

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.

      parent reply	other threads:[~2012-09-04 16:57 UTC|newest]

Thread overview: 11+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <1346396137.2586.301.camel@edumazet-glaptop>
2012-08-31 13:50 ` [RFC] fq_codel : interval servo on hosts Eric Dumazet
2012-08-31 13:57   ` [RFC v2] " Eric Dumazet
2012-09-01  1:37     ` Yuchung Cheng
2012-09-01 12:51       ` Eric Dumazet
2012-09-04 15:10         ` Nandita Dukkipati
2012-09-04 15:25           ` Jonathan Morton
2012-09-04 15:39             ` Eric Dumazet
2012-09-04 15:34           ` Eric Dumazet
2012-09-04 16:40             ` Dave Taht
2012-09-04 16:54               ` Eric Dumazet
2012-09-04 16:57               ` Eric Dumazet [this message]

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