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Eric Dumazet 9d21493b4b net: tx scalability works : trans_start 
struct net_device trans_start field is a hot spot on SMP and high performance
devices, particularly multi queues ones, because every transmitter dirties
it. Is main use is tx watchdog and bonding alive checks.

But as most devices dont use NETIF_F_LLTX, we have to lock
a netdev_queue before calling their ndo_start_xmit(). So it makes
sense to move trans_start from net_device to netdev_queue. Its update
will occur on a already present (and in exclusive state) cache line, for
free.

We can do this transition smoothly. An old driver continue to
update dev->trans_start, while an updated one updates txq->trans_start.

Further patches could also put tx_bytes/tx_packets counters in 
netdev_queue to avoid dirtying dev->stats (vlan device comes to mind)

Signed-off-by: Eric Dumazet <dada1@cosmosbay.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2009-05-17 20:55:16 -07:00
..
act_api.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
act_gact.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
act_ipt.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
act_mirred.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
act_nat.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
act_pedit.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
act_police.c pkt_sched: act_police: Fix a rate estimator test. 2009-03-04 17:38:10 -08:00
act_simple.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
act_skbedit.c tc: propogate errors from tcf_hash_create 2008-11-25 21:13:25 -08:00
cls_api.c net: Only store high 16 bits of kernel generated filter priorities 2009-05-02 13:48:32 -07:00
cls_basic.c pkt_sched: remove unnecessary xchg() in packet classifiers 2008-11-20 04:14:28 -08:00
cls_cgroup.c cls_cgroup: remove unneeded cgroup_lock 2009-05-17 11:59:48 -07:00
cls_flow.c CRED: Use creds in file structs 2008-11-14 10:39:25 +11:00
cls_fw.c pkt_sched: remove unnecessary xchg() in packet classifiers 2008-11-20 04:14:28 -08:00
cls_route.c pkt_sched: remove unnecessary xchg() in packet classifiers 2008-11-20 04:14:28 -08:00
cls_rsvp.c [NET_SCHED]: Remove unnecessary includes 2007-07-10 22:16:41 -07:00
cls_rsvp.h [NET_SCHED]: Use nla_policy for attribute validation in classifiers 2008-01-28 15:11:23 -08:00
cls_rsvp6.c [NET_SCHED]: Remove unnecessary includes 2007-07-10 22:16:41 -07:00
cls_tcindex.c pkt_sched: remove unnecessary xchg() in packet classifiers 2008-11-20 04:14:28 -08:00
cls_u32.c pkt_sched: cls_u32: Fix locking in u32_change() 2009-01-05 18:14:19 -08:00
em_cmp.c net: em_cmp.c use unaligned access helpers 2008-09-22 19:20:51 -07:00
em_meta.c netsched: Allow meta match on vlan tag on receive 2009-04-13 18:12:57 -07:00
em_nbyte.c [NET_SCHED]: ematch: module autoloading 2007-07-11 19:46:26 -07:00
em_text.c [NET_SCHED]: Convert classifiers from rtnetlink to new netlink API 2008-01-28 15:11:11 -08:00
em_u32.c [PKT_SCHED]: annotate cls_u32 2008-03-17 22:46:46 -07:00
ematch.c ematch: simpler tcf_em_unregister() 2008-11-16 23:01:49 -08:00
Kconfig cls_cgroup: clean up Kconfig 2008-12-29 19:40:46 -08:00
Makefile pkt_sched: add DRR scheduler 2008-11-20 04:10:00 -08:00
sch_api.c pkt_sched: sch_hfsc: sch_htb: Add non-work-conserving warning handler. 2009-02-01 01:12:42 -08:00
sch_atm.c pkt_sched: remove unnecessary xchg() in packet schedulers 2008-11-20 04:11:36 -08:00
sch_blackhole.c pkt_sched: Add qdisc->ops->peek() implementation. 2008-10-31 00:45:55 -07:00
sch_cbq.c pkt_sched: Change misleading code in class delete. 2009-03-15 20:00:19 -07:00
sch_drr.c pkt_sched: Change misleading code in class delete. 2009-03-15 20:00:19 -07:00
sch_dsmark.c pkt_sched: remove unnecessary xchg() in packet schedulers 2008-11-20 04:11:36 -08:00
sch_fifo.c net-sched: fix bfifo default limit 2009-05-06 16:45:07 -07:00
sch_generic.c net: tx scalability works : trans_start 2009-05-17 20:55:16 -07:00
sch_gred.c pkt_sched: Remove qdisc->ops->requeue() etc. 2008-11-13 22:56:30 -08:00
sch_hfsc.c pkt_sched: Change misleading code in class delete. 2009-03-15 20:00:19 -07:00
sch_htb.c pkt_sched: Change misleading code in class delete. 2009-03-15 20:00:19 -07:00
sch_ingress.c net_sched: Add accessor function for packet length for qdiscs 2008-07-20 00:08:27 -07:00
sch_multiq.c pkt_sched: sch_multiq: Change errno on non-multiqueue devices use. 2009-02-10 00:11:21 -08:00
sch_netem.c net: sch_netem: Fix an inconsistency in ingress netem timestamps. 2009-04-20 02:14:59 -07:00
sch_prio.c pkt_sched: remove unnecessary xchg() in packet schedulers 2008-11-20 04:11:36 -08:00
sch_red.c pkt_sched: remove unnecessary xchg() in packet schedulers 2008-11-20 04:11:36 -08:00
sch_sfq.c remove lots of double-semicolons 2009-01-08 08:31:14 -08:00
sch_tbf.c net/*: use linux/kernel.h swap() 2009-03-21 13:36:17 -07:00
sch_teql.c sch_teql: convert to net_device_ops 2009-01-06 10:45:57 -08:00