From: Stephen Hemminger <shemminger-ZtmgI6mnKB3QT0dZR+AlfA@public•gmane.org>
To: Eric Dumazet <eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public•gmane.org>
Cc: Dave Taht <dave.taht-Re5JQEeQqe8AvxtiuMwx3w@public•gmane.org>,
David Miller <davem-fT/PcQaiUtIeIZ0/mPfg9Q@public•gmane.org>,
linux-wireless
<linux-wireless-u79uwXL29TY76Z2rM5mHXA@public•gmane.org>,
netdev-u79uwXL29TY76Z2rM5mHXA@public•gmane.org,
Hagen Paul Pfeifer <hagen-GvnIQ6b/HdU@public•gmane.org>,
bloat-devel
<bloat-devel-JXvr2/1DY2fm6VMwtOF2vx4hnT+Y9+D1@public•gmane.org>,
bloat <bloat-JXvr2/1DY2fm6VMwtOF2vx4hnT+Y9+D1@public•gmane.org>
Subject: Re: [PATCH net-next] sch_red: Adaptative RED AQM
Date: Thu, 8 Dec 2011 09:21:30 -0800 [thread overview]
Message-ID: <20111208092130.656c39ff@nehalam.linuxnetplumber.net> (raw)
In-Reply-To: <1323360363.2521.30.camel@edumazet-HP-Compaq-6005-Pro-SFF-PC>
On Thu, 08 Dec 2011 17:06:03 +0100
Eric Dumazet <eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public•gmane.org> wrote:
> Changes against our RED implementation are :
>
> max_p is no longer a negative power of two (1/(2^Plog)), but a Q0.32
> fixed point number, to allow full range described in Adatative paper.
>
> To deliver a random number, we now use a reciprocal divide (thats really
> a multiply), but this operation is done once per marked/droped packet
> when in RED_BETWEEN_TRESH window, so added cost (compared to previous
> AND operation) is near zero.
>
> dump operation gives current max_p value in a new TCA_RED_MAX_P
> attribute.
>
> Example on a 10Mbit link :
>
> tc qdisc add dev $DEV parent 1:1 handle 10: est 1sec 8sec red \
> limit 400000 min 30000 max 90000 avpkt 1000 \
> burst 55 ecn adaptative bandwidth 10Mbit
>
> # tc -s -d qdisc show dev eth3
> ...
> qdisc red 10: parent 1:1 limit 400000b min 30000b max 90000b ecn
> adaptative ewma 5 max_p=0.113335 Scell_log 15
> Sent 50414282 bytes 34504 pkt (dropped 35, overlimits 1392 requeues 0)
> rate 9749Kbit 831pps backlog 72056b 16p requeues 0
> marked 1357 early 35 pdrop 0 other 0
>
>
> Signed-off-by: Eric Dumazet <eric.dumazet-Re5JQEeQqe8AvxtiuMwx3w@public•gmane.org>
Is this backward compatible for users that don't specify
an adaptive parameter.
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next prev parent reply other threads:[~2011-12-08 17:21 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-12-05 9:05 Time in Queue, bufferbloat, and... our accidentally interplanetary network Dave Taht
2011-12-05 10:59 ` Eric Dumazet
2011-12-06 2:03 ` Adrian Chadd
[not found] ` <CAJ-VmomuA7u5=zRGMK2Jd3WG+HWTRTZNST4JDVWU9kUEcfE91Q-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-12-07 9:59 ` Dave Taht
2011-12-07 10:15 ` Hagen Paul Pfeifer
2011-12-07 10:19 ` Hagen Paul Pfeifer
2011-12-07 11:53 ` [Bloat] " Eric Dumazet
2011-12-08 16:06 ` [PATCH net-next] sch_red: Adaptative RED AQM Eric Dumazet
2011-12-08 17:21 ` Stephen Hemminger [this message]
2011-12-08 18:16 ` Eric Dumazet
2011-12-09 12:46 ` [PATCH net-next] sch_red: generalize accurate MAX_P support to RED/GRED/CHOKE Eric Dumazet
2011-12-09 18:46 ` David Miller
2011-12-09 0:55 ` [PATCH net-next] sch_red: Adaptative RED AQM David Miller
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