From: Krishna Kumar <krkumar2@in.ibm.com>
Date: Mon, 31 Aug 2009 05:20:28 +0000 (-0700)
Subject: pkt_sched: Fix resource limiting in pfifo_fast
X-Git-Tag: v2.6.32-rc1~703^2~211
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=a453e0689a3ccf85c08cb89753d7685046248c5c;p=pandora-kernel.git

pkt_sched: Fix resource limiting in pfifo_fast

pfifo_fast_enqueue has this check:
        if (skb_queue_len(list) < qdisc_dev(qdisc)->tx_queue_len) {

which allows each band to enqueue upto tx_queue_len skbs for a
total of 3*tx_queue_len skbs. I am not sure if this was the
intention of limiting in qdisc.

Patch compiled and 32 simultaneous netperf testing ran fine. Also:
# tc -s qdisc show dev eth2
qdisc pfifo_fast 0: root bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
 Sent 16835026752 bytes 373116 pkt (dropped 0, overlimits 0 requeues 25)
 rate 0bit 0pps backlog 0b 0p requeues 25

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
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