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authorEric Dumazet <eric.dumazet@gmail.com>2010-06-02 16:09:29 +0400
committerDavid S. Miller <davem@davemloft.net>2010-06-02 16:09:29 +0400
commit79640a4ca6955e3ebdb7038508fa7a0cd7fa5527 (patch)
tree128a3d1e9d173963070d49cc64ad38d8eb67dd7b /net/sched/sch_generic.c
parent097811bb48c7837db94d7fe5d94f0f4b5e19e78c (diff)
downloadlinux-79640a4ca6955e3ebdb7038508fa7a0cd7fa5527.tar.xz
net: add additional lock to qdisc to increase throughput
When many cpus compete for sending frames on a given qdisc, the qdisc spinlock suffers from very high contention. The cpu owning __QDISC_STATE_RUNNING bit has same priority to acquire the lock, and cannot dequeue packets fast enough, since it must wait for this lock for each dequeued packet. One solution to this problem is to force all cpus spinning on a second lock before trying to get the main lock, when/if they see __QDISC_STATE_RUNNING already set. The owning cpu then compete with at most one other cpu for the main lock, allowing for higher dequeueing rate. Based on a previous patch from Alexander Duyck. I added the heuristic to avoid the atomic in fast path, and put the new lock far away from the cache line used by the dequeue worker. Also try to release the busylock lock as late as possible. Tests with following script gave a boost from ~50.000 pps to ~600.000 pps on a dual quad core machine (E5450 @3.00GHz), tg3 driver. (A single netperf flow can reach ~800.000 pps on this platform) for j in `seq 0 3`; do for i in `seq 0 7`; do netperf -H 192.168.0.1 -t UDP_STREAM -l 60 -N -T $i -- -m 6 & done done Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Acked-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/sched/sch_generic.c')
-rw-r--r--net/sched/sch_generic.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/net/sched/sch_generic.c b/net/sched/sch_generic.c
index 37b86eab6779..d20fcd2a5519 100644
--- a/net/sched/sch_generic.c
+++ b/net/sched/sch_generic.c
@@ -561,6 +561,7 @@ struct Qdisc *qdisc_alloc(struct netdev_queue *dev_queue,
INIT_LIST_HEAD(&sch->list);
skb_queue_head_init(&sch->q);
+ spin_lock_init(&sch->busylock);
sch->ops = ops;
sch->enqueue = ops->enqueue;
sch->dequeue = ops->dequeue;