netdev - Re: [PATCH net-next] sch_red: generalize accurate MAX

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Message-Id: <20111209.134645.470426835770901939.davem@davemloft.net>
Date:	Fri, 09 Dec 2011 13:46:45 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	shemminger@...tta.com, dave.taht@...il.com, netdev@...r.kernel.org,
	hagen@...u.net
Subject: Re: [PATCH net-next] sch_red: generalize accurate MAX_P support to
 RED/GRED/CHOKE

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Fri, 09 Dec 2011 13:46:45 +0100

> Now RED uses a Q0.32 number to store max_p (max probability), allow
> RED/GRED/CHOKE to use/report full resolution at config/dump time.
> 
> Old tc binaries are non aware of new attributes, and still set/get Plog.
> 
> New tc binary set/get both Plog and max_p for backward compatibility,
> they display "probability value" if they get max_p from new kernels.
> 
> # tc -d  qdisc show dev ...
> ...
> qdisc red 10: parent 1:1 limit 360Kb min 30Kb max 90Kb ecn ewma 5
> probability 0.09 Scell_log 15
> 
> Make sure we avoid potential divides by 0 in reciprocal_value(), if
> (max_th - min_th) is big.
> 
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Applied, thanks.
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