Toshiaki Makita 432c856fcf net: skb_segment() should preserve backpressure ...

This patch generalizes commit d6a4a1041176 ("tcp: GSO should be TSQ
friendly") to protocols using skb_set_owner_w()

TCP uses its own destructor (tcp_wfree) and needs a more complex scheme
as explained in commit 6ff50cd55545 ("tcp: gso: do not generate out of
order packets")

This allows UDP sockets using UFO to get proper backpressure,
thus avoiding qdisc drops and excessive cpu usage.

Here are performance test results (macvlan on vlan):

- Before
# netperf -t UDP_STREAM ...
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   65507   60.00      144096 1224195    1258.56
212992           60.00          51              0.45

Average:        CPU     %user     %nice   %system   %iowait    %steal     %idle
Average:        all      0.23      0.00     25.26      0.08      0.00     74.43

- After
# netperf -t UDP_STREAM ...
Socket  Message  Elapsed      Messages
Size    Size     Time         Okay Errors   Throughput
bytes   bytes    secs            #      #   10^6bits/sec

212992   65507   60.00      109593      0     957.20
212992           60.00      109593            957.20

Average:        CPU     %user     %nice   %system   %iowait    %steal     %idle
Average:        all      0.18      0.00      8.38      0.02      0.00     91.43

[edumazet] Rewrote patch and changelog.

Signed-off-by: Toshiaki Makita <makita.toshiaki@lab.ntt.co.jp>
Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

2014-10-29 14:47:19 -04:00

..

datagram.c

net: treewide: Fix typo found in DocBook/networking.xml

2014-09-05 17:35:28 -07:00

dev_addr_lists.c

net: Add support for device specific address syncing

2014-06-02 10:40:54 -07:00

dev_ioctl.c

dev_ioctl: remove dev_load() CAP_SYS_MODULE message

2014-09-05 12:04:40 -07:00

dev.c

Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net

2014-10-18 09:31:37 -07:00

drop_monitor.c

net: Replace get_cpu_var through this_cpu_ptr

2014-08-26 13:45:47 -04:00

dst.c

ipv4: fix dst race in sk_dst_get()

2014-06-25 17:41:44 -07:00

ethtool.c

ethtool: Ethtool parameter to dynamically change tx_copybreak

2014-10-06 01:04:16 -04:00

fib_rules.c

net: fix 'ip rule' iif/oif device rename

2014-02-09 19:02:52 -08:00

filter.c

net: filter: fix the comments

2014-10-10 15:11:51 -04:00

flow_dissector.c

flow-dissector: Fix alignment issue in __skb_flow_get_ports

2014-10-10 15:33:47 -04:00

flow.c

CPU hotplug notifiers registration fixes for 3.15-rc1

2014-04-07 14:55:46 -07:00

gen_estimator.c

net: sched: make bstats per cpu and estimator RCU safe

2014-09-30 01:02:26 -04:00

gen_stats.c

net_sched: fix unused variables in __gnet_stats_copy_basic_cpu()

2014-10-07 00:10:49 -04:00

iovec.c

net: sendmsg: fix NULL pointer dereference

2014-07-29 12:20:22 -07:00

link_watch.c

arch: Mass conversion of smp_mb__*()

2014-04-18 14:20:48 +02:00

Makefile

dmaengine-3.17

2014-10-07 20:39:25 -04:00

neighbour.c

neighbour : fix ndm_type type error issue

2014-07-28 17:52:17 -07:00

net_namespace.c

netns: remove one sparse warning

2014-09-09 20:10:45 -07:00

net-procfs.c

rps: selective flow shedding during softnet overflow

2013-05-20 13:48:04 -07:00

net-sysfs.c

net: do not name the pointer to struct net_device net

2014-07-24 23:33:55 -07:00

net-sysfs.h

net: netdev_kobject_init: annotate with __init

2014-01-05 20:27:54 -05:00

net-traces.c

net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules

2011-10-31 19:30:30 -04:00

netclassid_cgroup.c

cgroup: rename cgroup_subsys->base_cftypes to ->legacy_cftypes

2014-07-15 11:05:09 -04:00

netevent.c

net: Add export.h for EXPORT_SYMBOL/THIS_MODULE to non-modules

2011-10-31 19:30:30 -04:00

netpoll.c

net: Pass a "more" indication down into netdev_start_xmit() code paths.

2014-09-01 17:39:55 -07:00

netprio_cgroup.c

cgroup: rename cgroup_subsys->base_cftypes to ->legacy_cftypes

2014-07-15 11:05:09 -04:00

pktgen.c

net: pktgen: packet bursting via skb->xmit_more

2014-10-01 22:08:12 -04:00

ptp_classifier.c

net: filter: split 'struct sk_filter' into socket and bpf parts

2014-08-02 15:03:58 -07:00

request_sock.c

inet: reduce TLB pressure for listeners

2014-06-25 16:37:24 -07:00

rtnetlink.c

rtnl/do_setlink(): notify when a netdev is modified

2014-09-02 12:57:04 -07:00

scm.c

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/user-namespace

2013-09-07 14:35:32 -07:00

secure_seq.c

net: use ktime_get_ns() and ktime_get_real_ns() helpers

2014-08-22 19:57:23 -07:00

skbuff.c

net: skb_segment() should preserve backpressure

2014-10-29 14:47:19 -04:00

sock_diag.c

net: filter: split 'struct sk_filter' into socket and bpf parts

2014-08-02 15:03:58 -07:00

sock.c

net: Trap attempts to call sock_kfree_s() with a NULL pointer.

2014-10-14 17:02:37 -04:00

stream.c

net: replace macros net_random and net_srandom with direct calls to prandom

2014-01-14 15:15:25 -08:00

sysctl_net_core.c

rps: NUMA flow limit allocations

2013-12-19 19:00:07 -05:00

timestamping.c

net-timestamp: Make the clone operation stand-alone from phy timestamping

2014-09-05 17:43:45 -07:00

tso.c

net: tso: fix unaligned access to crafted TCP header in helper API

2014-10-22 12:52:55 -04:00

utils.c

net: optimise inet_proto_csum_replace4()

2014-09-26 16:14:17 -04:00