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1abbe1394a
kernel-ark/include/net
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Eric Dumazet 1abbe1394a pkt_sched: avoid requeues if possible 
With BQL being deployed, we can more likely have following behavior :

We dequeue a packet from qdisc in dequeue_skb(), then we realize target
tx queue is in XOFF state in sch_direct_xmit(), and we have to hold the
skb into gso_skb for later.

This shows in stats (tc -s qdisc dev eth0) as requeues.

Problem of these requeues is that high priority packets can not be
dequeued as long as this (possibly low prio and big TSO packet) is not
removed from gso_skb.

At 1Gbps speed, a full size TSO packet is 500 us of extra latency.

In some cases, we know that all packets dequeued from a qdisc are
for a particular and known txq :

- If device is non multi queue
- For all MQ/MQPRIO slave qdiscs

This patch introduces a new qdisc flag, TCQ_F_ONETXQUEUE to mark
this capability, so that dequeue_skb() is allowed to dequeue a packet
only if the associated txq is not stopped.

This indeed reduce latencies for high prio packets (or improve fairness
with sfq/fq_codel), and almost remove qdisc 'requeues'.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Jamal Hadi Salim <jhs@mojatatu.com>
Cc: John Fastabend <john.r.fastabend@intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2012-12-12 00:16:47 -05:00
..
9p
bluetooth Bluetooth: trivial: Change NO_FCS_RECV to RECV_NO_FCS 2012-12-03 16:00:01 -02:00
caif caif-hsi: Remove use of module parameters 2012-06-25 16:44:12 -07:00
irda TTY: ircomm, use tty from tty_port 2012-06-12 15:50:24 -07:00
iucv af_iucv: add shutdown for HS transport 2012-03-07 22:52:24 -08:00
netfilter netfilter: nf_nat: Handle routing changes in MASQUERADE target 2012-12-03 15:14:20 +01:00
netns sctp: Make hmac algorithm selection for cookie generation dynamic 2012-10-26 02:22:18 -04:00
nfc NFC: Export nfc_hci_sak_to_protocol() 2012-11-19 23:56:59 +01:00
phonet net: remove my future former mail address 2012-06-17 16:29:38 -07:00
sctp sctp: Add RCU protection to assoc->transport_addr_list 2012-12-07 14:15:04 -05:00
tc_act
act_api.h
addrconf.h netconf: advertise mc_forwarding status 2012-12-04 13:08:10 -05:00
af_ieee802154.h
af_rxrpc.h
af_unix.h unix: Remove unused field from unix_sock 2012-10-21 20:37:06 -04:00
ah.h
arp.h net: Dont use ifindices in hash fns 2012-08-09 16:18:06 -07:00
atmclip.h
ax25.h userns: Convert net/ax25 to use kuid_t where appropriate 2012-08-14 21:49:42 -07:00
ax88796.h
cfg80211-wext.h
cfg80211.h cfg80211: fix BSS struct IE access races 2012-11-30 13:42:20 +01:00
checksum.h net: core: add function for incremental IPv6 pseudo header checksum updates 2012-08-30 03:00:16 +02:00
cipso_ipv4.h cipso: handle CIPSO options correctly when NetLabel is disabled 2012-06-01 14:18:29 -04:00
cls_cgroup.h net: Update args to dummy sock_update_classid(). 2012-10-26 05:07:00 -04:00
codel.h codel: refine one condition to avoid a nul rec_inv_sqrt 2012-08-10 16:52:54 -07:00
compat.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
datalink.h
dcbevent.h
dcbnl.h net/dcb: Add an optional max rate attribute 2012-04-05 05:08:04 -04:00
dn_dev.h
dn_fib.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
dn_neigh.h
dn_nsp.h
dn_route.h decnet: Use neighbours privately in dn_route struct. 2012-07-05 01:12:14 -07:00
dn.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
dsa.h
dsfield.h
dst_ops.h net: Fix warnings in dst_ops.h 2012-07-19 10:43:03 -07:00
dst.h Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2012-08-22 14:21:38 -07:00
esp.h
ethoc.h
fib_rules.h ipv4: Elide fib_validate_source() completely when possible. 2012-06-29 01:36:36 -07:00
flow_keys.h
flow.h ipv4: Add FLOWI_FLAG_KNOWN_NH 2012-10-08 17:42:36 -04:00
garp.h
gen_stats.h
genetlink.h netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
gre.h
gro_cells.h net: fix a race in gro_cell_poll() 2012-12-11 12:49:53 -05:00
icmp.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
ieee80211_radiotap.h mac80211: support (partial) VHT radiotap information 2012-11-27 11:56:18 +01:00
ieee802154_netdev.h mac802154: declare reduced mlme operations 2012-05-16 15:16:56 -04:00
ieee802154.h
if_inet6.h net: delete all instances of special processing for token ring 2012-05-15 20:14:35 -04:00
inet6_connection_sock.h ipv6: Add helper inet6_csk_update_pmtu(). 2012-07-16 03:44:56 -07:00
inet6_hashtables.h ipv6: Early TCP socket demux 2012-07-26 15:50:39 -07:00
inet_common.h net-tcp: Fast Open client - sendmsg(MSG_FASTOPEN) 2012-07-19 11:02:03 -07:00
inet_connection_sock.h net: ipv6: fix TCP early demux 2012-08-06 13:33:21 -07:00
inet_ecn.h tunnel: drop packet if ECN present with not-ECT 2012-09-27 18:12:37 -04:00
inet_frag.h ipv6: unify fragment thresh handling code 2012-09-19 17:23:28 -04:00
inet_hashtables.h net: fix sparse endianness warnings on sock_common 2012-12-02 20:23:01 -05:00
inet_sock.h net: move inet_dport/inet_num in sock_common 2012-11-30 15:02:56 -05:00
inet_timewait_sock.h net: move inet_dport/inet_num in sock_common 2012-11-30 15:02:56 -05:00
inetpeer.h ipv4: Maintain redirect and PMTU info in struct rtable again. 2012-07-10 22:40:14 -07:00
ip6_checksum.h ipv6: Separate tcp offload functionality 2012-11-15 17:36:18 -05:00
ip6_fib.h ipv6: remove rt6i_peer_genid from rt6_info and its handler 2012-11-08 21:16:08 -05:00
ip6_route.h ipv6: export IP6_RT_PRIO_* to userland 2012-11-16 01:47:40 -05:00
ip6_tunnel.h gre: Support GRE over IPv6 2012-08-14 14:28:32 -07:00
ip_fib.h ipv4: add a fib_type to fib_info 2012-10-04 13:58:26 -04:00
ip_vs.h ipvs: fix build errors related to config option combinations 2012-10-23 09:23:40 +09:00
ip.h ipv4: fix path MTU discovery with connection tracking 2012-08-26 19:13:55 +02:00
ipcomp.h
ipconfig.h
ipip.h net: convert __IPTUNNEL_XMIT() to an inline function 2012-11-14 18:49:50 -05:00
ipv6.h ipv6: unify logic evaluating inet6_dev's accept_ra property 2012-12-01 11:36:37 -05:00
ipx.h
iw_handler.h
lapb.h lapb: Neaten debugging 2012-05-17 18:45:20 -04:00
lib80211.h
llc_c_ac.h
llc_c_ev.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
llc_c_st.h
llc_conn.h
llc_if.h
llc_pdu.h net: delete all instances of special processing for token ring 2012-05-15 20:14:35 -04:00
llc_s_ac.h
llc_s_ev.h
llc_s_st.h
llc_sap.h
llc.h llc: Remove stray reference to sysctl_llc_station_ack_timeout. 2012-09-17 13:13:24 -04:00
mac80211.h mac80211: introduce IEEE80211_HW_TEARDOWN_AGGR_ON_BAR_FAIL 2012-12-05 09:53:31 +01:00
mac802154.h mac802154: add wpan device-class support 2012-06-26 21:06:11 -07:00
mip6.h
mld.h
ndisc.h net: Dont use ifindices in hash fns 2012-08-09 16:18:06 -07:00
neighbour.h net: output path optimizations 2012-08-07 16:24:55 -07:00
net_namespace.h userns: make each net (net_ns) belong to a user_ns 2012-11-18 20:30:55 -05:00
net_ratelimit.h
netdma.h
netevent.h net: Pass neighbours and dest address into NETEVENT_REDIRECT events. 2012-07-05 02:21:55 -07:00
netlabel.h userns: Convert the audit loginuid to be a kuid 2012-09-17 18:08:54 -07:00
netlink.h netlink: Rename pid to portid to avoid confusion 2012-09-10 15:30:41 -04:00
netprio_cgroup.h cgroup: Assign subsystem IDs during compile time 2012-09-14 09:57:43 -07:00
netrom.h
nexthop.h
nl802154.h
p8022.h
ping.h
pkt_cls.h
pkt_sched.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
protocol.h net: Remove code duplication between offload structures 2012-11-15 17:39:51 -05:00
psnap.h
raw.h
rawv6.h ipv6: bool/const conversions phase2 2012-05-19 01:08:16 -04:00
red.h net_sched: red: Make minor corrections to comments 2012-04-16 23:53:11 -04:00
regulatory.h cfg80211: add cellular base station regulatory hint support 2012-07-17 12:16:39 +02:00
request_sock.h tcp: better retrans tracking for defer-accept 2012-11-03 14:45:00 -04:00
rose.h
route.h ipv4: avoid a test in ip_rt_put() 2012-11-03 14:59:04 -04:00
rtnetlink.h rtnelink: remove unused parameter from rtnl_create_link(). 2012-11-30 12:24:40 -05:00
sch_generic.h pkt_sched: avoid requeues if possible 2012-12-12 00:16:47 -05:00
scm.h net: Remove unnecessary NULL check in scm_destroy(). 2012-09-24 15:52:33 -04:00
secure_seq.h
slhc_vj.h
snmp.h net: avoid reloads in SNMP_UPD_PO_STATS 2012-08-06 13:40:47 -07:00
sock.h net: fix sparse endianness warnings on sock_common 2012-12-02 20:23:01 -05:00
stp.h
tcp_memcontrol.h cgroup: pass struct mem_cgroup instead of struct cgroup to socket memcg 2012-04-10 10:04:07 -07:00
tcp_states.h
tcp.h tcp: remove dead prototype for tcp_v4_get_peer() 2012-11-23 14:10:31 -05:00
timewait_sock.h [PATCH] tcp: Cache inetpeer in timewait socket, and only when necessary. 2012-06-09 14:56:12 -07:00
transp_v6.h
udp.h net/ipv6/udp: UDP encapsulation: introduce encap_rcv hook into IPv6 2012-04-28 22:21:51 -04:00
udplite.h net: ipv4: Standardize prefixes for message logging 2012-03-12 17:05:21 -07:00
wext.h
wimax.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
wpan-phy.h mac802154: monitor device support 2012-05-16 15:17:08 -04:00
x25.h net: cleanup unsigned to unsigned int 2012-04-15 12:44:40 -04:00
x25device.h
xfrm.h xfrm: Fix the gc threshold value for ipv4 2012-11-13 09:15:07 +01:00