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Krishna Kumar bbd8a0d3a3 net: Avoid enqueuing skb for default qdiscs 
dev_queue_xmit enqueue's a skb and calls qdisc_run which
dequeue's the skb and xmits it. In most cases, the skb that
is enqueue'd is the same one that is dequeue'd (unless the
queue gets stopped or multiple cpu's write to the same queue
and ends in a race with qdisc_run). For default qdiscs, we
can remove the redundant enqueue/dequeue and simply xmit the
skb since the default qdisc is work-conserving.

The patch uses a new flag - TCQ_F_CAN_BYPASS to identify the
default fast queue. The controversial part of the patch is
incrementing qlen when a skb is requeued - this is to avoid
checks like the second line below:

+  } else if ((q->flags & TCQ_F_CAN_BYPASS) && !qdisc_qlen(q) &&
>>         !q->gso_skb &&
+          !test_and_set_bit(__QDISC_STATE_RUNNING, &q->state)) {

Results of a 2 hour testing for multiple netperf sessions (1,
2, 4, 8, 12 sessions on a 4 cpu system-X). The BW numbers are
aggregate Mb/s across iterations tested with this version on
System-X boxes with Chelsio 10gbps cards:

----------------------------------
Size |  ORG BW          NEW BW   |
----------------------------------
128K |  156964          159381   |
256K |  158650          162042   |
----------------------------------

Changes from ver1:

1. Move sch_direct_xmit declaration from sch_generic.h to
   pkt_sched.h
2. Update qdisc basic statistics for direct xmit path.
3. Set qlen to zero in qdisc_reset.
4. Changed some function names to more meaningful ones.

Signed-off-by: Krishna Kumar <krkumar2@in.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
 		2009-08-06 20:10:18 -07:00
..
9p net/9p: handle correctly interrupted 9P requests 2009-04-05 16:54:53 -05:00
bluetooth Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/holtmann/bluetooth-next-2.6 2009-06-11 05:47:43 -07:00
irda net: mark read-only arrays as const 2009-08-05 10:42:58 -07:00
iucv af_iucv: Return -EAGAIN if iucv msg limit is exceeded 2009-06-19 00:10:40 -07:00
netfilter netfilter: tcp conntrack: fix unacknowledged data detection with NAT 2009-06-29 14:07:56 +02:00
netns net, netns_xt: shrink netns_xt members 2009-07-05 19:16:18 -07:00
phonet Phonet: sockets list through proc_fs 2009-07-23 17:58:19 -07:00
sctp net: mark read-only arrays as const 2009-08-05 10:42:58 -07:00
tc_act
…
tipc
…
act_api.h
…
addrconf.h ipv6: Fix conflict resolutions during ipv6 binding 2009-03-24 19:49:11 -07:00
af_ieee802154.h ieee802154: move headers out of extra directory 2009-07-23 17:08:51 +04:00
af_rxrpc.h
…
af_unix.h net: Fix soft lockups/OOM issues w/ unix garbage collector 2008-11-26 15:32:27 -08:00
ah.h
…
arp.h
…
atmclip.h clip: convert to internal network_device_stats 2009-01-21 14:01:59 -08:00
ax25.h
…
ax88796.h ax88796: Add method to take MAC from platform data 2009-03-24 23:32:03 -07:00
cfg80211.h cfg80211: enable country IE support to all cfg80211 drivers 2009-08-04 16:44:19 -04:00
checksum.h include/net net/ - csum_partial - remove unnecessary casts 2008-11-19 15:44:53 -08:00
cipso_ipv4.h netlabel: Label incoming TCP connections correctly in SELinux 2009-03-28 15:01:36 +11:00
compat.h
…
datalink.h
…
dcbnl.h net: fix DCB setstate to return success/failure 2008-12-21 20:09:50 -08:00
dn.h decnet: compile fix for removal of byteorder wrapper 2008-11-27 23:04:13 -08:00
dn_dev.h
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dn_fib.h decnet: remove private wrappers of endian helpers 2008-11-27 00:12:47 -08:00
dn_neigh.h
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dn_nsp.h
…
dn_route.h
…
dsa.h dsa: add switch chip cascading support 2009-03-21 19:06:54 -07:00
dsfield.h
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dst.h net: skb->dst accessors 2009-06-03 02:51:04 -07:00
esp.h
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ethoc.h net: Add support for the OpenCores 10/100 Mbps Ethernet MAC. 2009-03-27 00:16:21 -07:00
fib_rules.h net: Remove unused parameter from fill method in fib_rules_ops. 2009-05-20 17:26:23 -07:00
flow.h netns xfrm: lookup in netns 2008-11-25 17:35:18 -08:00
garp.h
…
gen_stats.h pkt_sched: gen_estimator: Optimize gen_estimator_active() 2008-11-26 15:24:32 -08:00
genetlink.h genetlink: make netns aware 2009-07-12 14:03:27 -07:00
icmp.h
…
ieee80211_radiotap.h wireless: radiotap updates 2009-03-27 20:12:52 -04:00
ieee802154.h ieee802154: move headers out of extra directory 2009-07-23 17:08:51 +04:00
ieee802154_netdev.h ieee802154: move headers out of extra directory 2009-07-23 17:08:51 +04:00
if_inet6.h ipv6: reorder struct inet6_ifaddr to remove padding on 64 bit builds 2009-03-21 13:29:05 -07:00
inet6_connection_sock.h
…
inet6_hashtables.h net: skb->dst accessors 2009-06-03 02:51:04 -07:00
inet_common.h
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inet_connection_sock.h
…
inet_ecn.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
inet_frag.h inet fragments: fix sparse warning: context imbalance 2009-02-26 23:13:35 -08:00
inet_hashtables.h net: skb->dst accessors 2009-06-03 02:51:04 -07:00
inet_sock.h Merge branch 'for-linus2' of git://git.kernel.org/pub/scm/linux/kernel/git/vegard/kmemcheck 2009-06-16 13:09:51 -07:00
inet_timewait_sock.h net: annotate inet_timewait_sock bitfields 2009-06-15 15:49:32 +02:00
inetpeer.h
…
ip.h snmp: add missing counters for RFC 4293 2009-04-27 02:45:02 -07:00
ip6_checksum.h
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ip6_fib.h xfrm: select sane defaults for xfrm[4|6] gc_thresh 2009-07-30 18:52:15 -07:00
ip6_route.h net: skb->dst accessors 2009-06-03 02:51:04 -07:00
ip6_tunnel.h
…
ip_fib.h ipv4: remove unused macro (FIB_RES_RESET) from ip_fib.h. 2009-05-03 14:19:51 -07:00
ip_vs.h net: mark read-only arrays as const 2009-08-05 10:42:58 -07:00
ipcomp.h
…
ipconfig.h
…
ipip.h sit: stateless autoconf for isatap 2009-05-19 16:02:02 -07:00
ipv6.h udpv6: Remove unused skb argument of ipv6_select_ident() 2009-07-12 14:29:28 -07:00
ipx.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
iw_handler.h wext: constify extra argument to wireless_send_event 2009-07-10 15:01:49 -04:00
lapb.h
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lib80211.h wireless: missing include in lib80211.h 2008-11-21 11:42:55 -05:00
llc.h
…
llc_c_ac.h
…
llc_c_ev.h
…
llc_c_st.h
…
llc_conn.h
…
llc_if.h
…
llc_pdu.h
…
llc_s_ac.h
…
llc_s_ev.h
…
llc_s_st.h
…
llc_sap.h
…
mac80211.h mac80211: FIF_PSPOLL filter flag 2009-08-04 16:44:35 -04:00
mip6.h
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ndisc.h ipv6: Fix sporadic sendmsg -EINVAL when sending to multicast groups. 2009-01-04 16:04:39 -08:00
neighbour.h neigh: Convert garbage collection from softirq to workqueue 2009-08-02 18:35:16 -07:00
net_namespace.h net: explain netns notifiers a little better 2009-07-20 08:03:00 -07:00
netdma.h net_dma: convert to dma_find_channel 2009-01-06 11:38:15 -07:00
netevent.h
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netlabel.h netlabel: Cleanup the Smack/NetLabel code to fix incoming TCP connections 2009-03-28 15:01:37 +11:00
netlink.h netfilter: conntrack: add support for DCCP handshake sequence to ctnetlink 2009-05-27 17:50:35 +02:00
netrom.h netrom: convert to internal net_device_stats 2009-01-21 14:02:01 -08:00
nexthop.h
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nl802154.h ieee802154: move headers out of extra directory 2009-07-23 17:08:51 +04:00
p8022.h
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pkt_cls.h ematch: simpler tcf_em_unregister() 2008-11-16 23:01:49 -08:00
pkt_sched.h net: Avoid enqueuing skb for default qdiscs 2009-08-06 20:10:18 -07:00
protocol.h ipv6: Use correct data types for ICMPv6 type and code 2009-06-23 04:31:07 -07:00
psnap.h snap: use const for descriptor 2009-03-21 19:06:50 -07:00
raw.h
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rawv6.h ipv6: Use correct data types for ICMPv6 type and code 2009-06-23 04:31:07 -07:00
red.h
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regulatory.h cfg80211: clean up includes 2009-04-22 16:57:17 -04:00
request_sock.h net: Fix memory leak in the proto_register function 2008-11-21 16:45:22 -08:00
rose.h NET: ROSE: Don't use static buffer. 2009-07-26 19:11:14 -07:00
route.h net: skb->rtable accessor 2009-06-03 02:51:02 -07:00
rtnetlink.h
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sch_generic.h net: Avoid enqueuing skb for default qdiscs 2009-08-06 20:10:18 -07:00
scm.h cleanup: remove unused member in scm_cookie. 2009-07-05 19:16:10 -07:00
slhc_vj.h
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snmp.h snmp: add missing counters for RFC 4293 2009-04-27 02:45:02 -07:00
sock.h net: sock_copy() fixes 2009-07-16 18:05:26 -07:00
stp.h
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tcp.h tcp: Fix MD5 signature checking on IPv4 mapped sockets 2009-07-20 07:49:07 -07:00
tcp_states.h
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timewait_sock.h net: Fix memory leak in the proto_register function 2008-11-21 16:45:22 -08:00
transp_v6.h net: replace __constant_{endian} uses in net headers 2009-02-14 22:58:35 -08:00
udp.h udpv4: Handle large incoming UDP/IPv4 packets and support software UFO. 2009-07-12 14:29:21 -07:00
udplite.h udp: introduce struct udp_table and multiple spinlocks 2008-10-29 01:41:45 -07:00
wext.h
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wimax.h rfkill: rewrite 2009-06-03 14:06:13 -04:00
x25.h x25: Fix sleep from timer on socket destroy. 2009-06-16 05:40:30 -07:00
x25device.h
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xfrm.h xfrm: select sane defaults for xfrm[4|6] gc_thresh 2009-07-30 18:52:15 -07:00