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Eric Dumazet 55a93b3ea7 qdisc: validate skb without holding lock 
Validation of skb can be pretty expensive :

GSO segmentation and/or checksum computations.

We can do this without holding qdisc lock, so that other cpus
can queue additional packets.

Trick is that requeued packets were already validated, so we carry
a boolean so that sch_direct_xmit() can validate a fresh skb list,
or directly use an old one.

Tested on 40Gb NIC (8 TX queues) and 200 concurrent flows, 48 threads
host.

Turning TSO on or off had no effect on throughput, only few more cpu
cycles. Lock contention on qdisc lock disappeared.

Same if disabling TX checksum offload.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-10-03 15:36:11 -07:00
..
6lowpan 6lowpan: Allow 6LoWPAN to be modular 2014-08-07 11:44:18 -07:00
9p 9P: remove unnecessary break after return 2014-07-15 16:27:00 -07:00
802 net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
8021q net: Always untag vlan-tagged traffic on input. 2014-08-11 12:16:51 -07:00
appletalk Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-07-16 14:09:34 -07:00
atm atm: Convert pr_warning to pr_warn 2014-09-10 12:40:10 -07:00
ax25 net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
batman-adv batman-adv: Fix parameter order of hlist_add_behind 2014-08-16 19:19:08 -07:00
bluetooth Bluetooth: Fix re-setting RPA as expired when deferring update 2014-09-12 18:34:25 +02:00
bridge net: bridge: add a br_set_state helper function 2014-10-01 22:03:50 -04:00
caif caif: remove unnecessary break after goto 2014-07-15 16:27:01 -07:00
can can: add hash based access to single EFF frame filters 2014-05-19 09:38:24 +02:00
ceph libceph: do not hard code max auth ticket len 2014-09-10 20:08:36 +04:00
core qdisc: validate skb without holding lock 2014-10-03 15:36:11 -07:00
dcb dcbnl : Fix misleading dcb_app->priority explanation 2014-07-30 17:21:05 -07:00
dccp net/dccp/ccid.c: add __init to ccid_activate 2014-10-01 18:33:13 -04:00
decnet af_decnet: Use time_after_eq 2014-08-22 12:23:11 -07:00
dns_resolver Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2014-08-06 08:06:39 -07:00
dsa net: dsa: Fix build warning for !PM_SLEEP 2014-10-01 15:24:00 -04:00
ethernet net: Add function for parsing the header length out of linear ethernet frames 2014-09-05 17:47:02 -07:00
hsr net/hsr: Remove left-over never-true conditional code. 2014-07-11 15:04:40 -07:00
ieee802154 ieee802154: fix __init functions 2014-10-01 02:03:13 -04:00
ipv4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-10-02 11:25:43 -07:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-10-02 11:25:43 -07:00
ipx net: Split sk_no_check into sk_no_check_{rx,tx} 2014-05-23 16:28:53 -04:00
irda irda: add __init to irlan_open 2014-09-30 17:08:06 -04:00
iucv iucv: Convert pr_warning to pr_warn 2014-09-10 12:40:10 -07:00
key af_key: remove unnecessary break after return 2014-07-15 16:27:00 -07:00
l2tp l2tp: Refactor l2tp core driver to make use of the common UDP tunnel functions 2014-09-19 15:57:15 -04:00
lapb
llc
mac80211 Merge tag 'master-2014-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-09-26 15:39:24 -04:00
mac802154 Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless 2014-09-08 11:14:56 -04:00
mpls net: Remove gso_send_check as an offload callback 2014-09-26 00:22:47 -04:00
netfilter Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-10-02 11:25:43 -07:00
netlabel Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-08-06 09:38:14 -07:00
netlink netlink: Annotate RCU locking for seq_file walker 2014-08-14 15:13:40 -07:00
netrom net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
nfc Merge tag 'master-2014-07-31' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-08-05 13:18:20 -07:00
openvswitch net/openvswitch: remove dup comment in vport.h 2014-09-26 16:42:33 -04:00
packet net: Pass a "more" indication down into netdev_start_xmit() code paths. 2014-09-01 17:39:55 -07:00
phonet net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
rfkill net: rfkill: gpio: Fix clock status 2014-09-22 16:02:15 -04:00
rose rose: use %*ph specifier 2014-09-07 16:07:25 -07:00
rxrpc Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-09-23 12:09:27 -04:00
sched qdisc: validate skb without holding lock 2014-10-03 15:36:11 -07:00
sctp net/ipv4: bind ip_nonlocal_bind to current netns 2014-09-09 11:27:09 -07:00
sunrpc NFS client updates for Linux 3.17 2014-08-13 18:13:19 -06:00
tipc tipc: fix sparse warnings 2014-09-10 14:00:58 -07:00
unix Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-06-12 14:27:40 -07:00
vmw_vsock vsock: Make transport the proto owner 2014-05-05 13:13:50 -04:00
wimax
wireless Merge tag 'master-2014-09-16' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-09-26 15:39:24 -04:00
x25 net: Fix use after free by removing length arg from sk_data_ready callbacks. 2014-04-11 16:15:36 -04:00
xfrm net: cleanup and document skb fclone layout 2014-10-01 16:34:25 -04:00
compat.c net: sendmsg: fix NULL pointer dereference 2014-07-29 12:20:22 -07:00
Kconfig netfilter: bridge: build br_nf_core only if required 2014-09-30 14:07:51 -04:00
Makefile 6lowpan: introduce new net/6lowpan directory 2014-07-12 01:53:30 +02:00
nonet.c
socket.c Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-09-23 12:09:27 -04:00
sysctl_net.c