On Thu, 08 Dec 2011 17:06:03 +0100 Eric Dumazet <eric.dumazet@xxxxxxxxx> 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@xxxxxxxxx> Is this backward compatible for users that don't specify an adaptive parameter. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
