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0a6b2a1dc2
linux/net
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Eric Dumazet 0a6b2a1dc2 tcp: switch to GSO being always on 
Oleksandr Natalenko reported performance issues with BBR without FQ
packet scheduler that were root caused to lack of SG and GSO/TSO on
his configuration.

In this mode, TCP internal pacing has to setup a high resolution timer
for each MSS sent.

We could implement in TCP a strategy similar to the one adopted
in commit fefa569a9d ("net_sched: sch_fq: account for schedule/timers drifts")
or decide to finally switch TCP stack to a GSO only mode.

This has many benefits :

1) Most TCP developments are done with TSO in mind.
2) Less high-resolution timers needs to be armed for TCP-pacing
3) GSO can benefit of xmit_more hint
4) Receiver GRO is more effective (as if TSO was used for real on sender)
   -> Lower ACK traffic
5) Write queues have less overhead (one skb holds about 64KB of payload)
6) SACK coalescing just works.
7) rtx rb-tree contains less packets, SACK is cheaper.

This patch implements the minimum patch, but we can remove some legacy
code as follow ups.

Tested:

On 40Gbit link, one netperf -t TCP_STREAM

BBR+fq:
sg on:  26 Gbits/sec
sg off: 15.7 Gbits/sec   (was 2.3 Gbit before patch)

BBR+pfifo_fast:
sg on:  24.2 Gbits/sec
sg off: 14.9 Gbits/sec  (was 0.66 Gbit before patch !!! )

BBR+fq_codel:
sg on:  24.4 Gbits/sec
sg off: 15 Gbits/sec  (was 0.66 Gbit before patch !!! )

Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: Oleksandr Natalenko <oleksandr@natalenko.name>
Signed-off-by: David S. Miller <davem@davemloft.net>
2018-02-21 14:24:13 -05:00
..
6lowpan License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
9p virtio: bugfixes 2018-02-15 14:29:27 -08:00
802 treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
8021q net: delete /proc THIS_MODULE references 2018-01-16 15:01:33 -05:00
appletalk net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
atm net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
ax25 net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
batman-adv vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
bluetooth Merge branch 'for-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/bluetooth/bluetooth-next 2018-02-15 15:43:49 -05:00
bpf bpf: fix null pointer deref in bpf_prog_test_run_xdp 2018-02-01 07:43:56 -08:00
bridge bridge: check brport attr show in brport_show 2018-02-12 11:17:28 -05:00
caif vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
can net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
ceph libceph: check kstrndup() return value 2018-01-29 18:36:12 +01:00
core tcp: switch to GSO being always on 2018-02-21 14:24:13 -05:00
dcb
dccp vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
decnet Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
dns_resolver afs: Support the AFS dynamic root 2018-02-06 14:43:37 +00:00
dsa net: dsa: forward timestamping callbacks to switch drivers 2018-02-14 14:33:37 -05:00
ethernet
hsr net: hsr: Convert timers to use timer_setup() 2017-10-25 13:00:27 +09:00
ieee802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
ife MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
ipv4 tcp: switch to GSO being always on 2018-02-21 14:24:13 -05:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
iucv net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
kcm kcm: Call strp_stop before strp_done in kcm_attach 2018-02-14 15:38:39 -05:00
key af_key: Fix memory leak in key_notify_policy. 2018-01-10 09:45:11 +01:00
l2tp net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
l3mdev
lapb treewide: Remove TIMER_FUNC_TYPE and TIMER_DATA_TYPE casts 2017-11-21 16:35:54 -08:00
llc net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
mac80211 debugfs_sta: Remove unneeded semicolons 2018-01-22 14:03:28 +01:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2017-11-04 09:26:51 +09:00
mpls mpls, nospec: Sanitize array index in mpls_label_ok() 2018-02-08 15:24:12 -05:00
ncsi net/ncsi: Don't take any action on HNCDSC AEN 2017-12-18 14:50:11 -05:00
netfilter net: Convert ip_tables_net_ops, udplite6_net_ops and xt_net_ops 2018-02-19 14:19:12 -05:00
netlabel net/netlabel: Add list_next_rcu() in rcu_dereference(). 2017-11-18 10:32:41 +09:00
netlink net: Convert netlink_tap_net_ops 2018-02-13 10:36:09 -05:00
netrom net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
nfc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
nsh openvswitch: enable NSH support 2017-11-08 16:12:33 +09:00
openvswitch openvswitch: Remove padding from packet before L3+ conntrack processing 2018-02-01 09:46:22 -05:00
packet net: Convert packet_net_ops 2018-02-13 10:36:08 -05:00
phonet net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
psample MAINTAINERS: Update Yotam's E-mail 2017-11-01 12:19:03 +09:00
qrtr net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
rds rds: send: mark expected switch fall-through in rds_rm_size 2018-02-21 14:18:18 -05:00
rfkill vfs: do bulk POLL* -> EPOLL* replacement 2018-02-11 14:34:03 -08:00
rose net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
rxrpc rxrpc: Work around usercopy check 2018-02-16 16:22:27 -05:00
sched net: sched: add em_ipt ematch for calling xtables matches 2018-02-21 13:15:33 -05:00
sctp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
smc net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
strparser strparser: Call sock_owned_by_user_nocheck 2017-12-28 14:28:22 -05:00
sunrpc net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
switchdev net: bridge: Add/del switchdev object on host join/leave 2017-11-10 13:41:40 +09:00
tipc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
tls tls: getsockopt return record sequence number 2018-02-14 15:05:19 -05:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2018-02-19 18:46:11 -05:00
vmw_vsock net: make getname() functions return length rather than use int* parameter 2018-02-12 14:15:04 -05:00
wimax License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
wireless net: Convert cfg80211_pernet_ops 2018-02-19 14:19:09 -05:00
x25 x25: use %*ph to print small buffer 2018-02-20 13:51:47 -05:00
xfrm net: Convert pernet_subsys, registered from inet_init() 2018-02-13 10:36:08 -05:00
compat.c net: compat: assert the size of cmsg copied in is as expected 2017-09-20 15:36:18 -07:00
Kconfig Staging/IIO patches for 4.16-rc1 2018-02-01 09:51:57 -08:00
Makefile ipx: move Novell IPX protocol support into staging 2017-11-28 13:55:00 +01:00
socket.c net: Make extern and export get_net_ns() 2018-02-15 15:34:42 -05:00
sysctl_net.c net: Convert sysctl_pernet_ops 2018-02-13 10:36:05 -05:00