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Message-Id: <20140819.110021.1713996150126013087.davem@davemloft.net>
Date: Tue, 19 Aug 2014 11:00:21 -0700 (PDT)
From: David Miller <davem@...emloft.net>
To: vvs@...allels.com
Cc: netdev@...r.kernel.org, jhs@...atatu.com, eric.dumazet@...il.com,
kuznet@....inr.ac.ru
Subject: Re: [PATCH net v2 0/2] cbq: incorrectly low bandwidth blocks
limited traffic
From: Vasily Averin <vvs@...allels.com>
Date: Thu, 14 Aug 2014 12:27:29 +0400
> v2: patch description changes
> Fixes: f0f6ee1f70c4 ("cbq: incorrect processing of high limits")
>
> Mainstream commit f0f6ee1f70c4 ("cbq: incorrect processing of high limits")
> have side effect: if cbq bandwidth setting is less than real interface
> throughput non-limited traffic can delay limited traffic for a very long time.
>
> This happen because of q->now changes incorrectly in cbq_dequeue():
> in described scenario L2T is much greater than real time delay,
> and q->now gets an extra boost for each transmitted packet.
>
> Accumulated boost prevents update q->now, and blocked class can wait
> very long time until (q->now >= cl->undertime) will be true again.
>
> More detailed problem description can be found here:
> http://www.spinics.net/lists/netdev/msg292493.html
>
> Following patches should fix the problem.
Series applied, thanks.
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