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Eric Dumazet d75b1ade56 net: less interrupt masking in NAPI 
net_rx_action() can mask irqs a single time to transfert sd->poll_list
into a private list, for a very short duration.

Then, napi_complete() can avoid masking irqs again,
and net_rx_action() only needs to mask irq again in slow path.

This patch removes 2 couples of irq mask/unmask per typical NAPI run,
more if multiple napi were triggered.

Note this also allows to give control back to caller (do_softirq())
more often, so that other softirq handlers can be called a bit earlier,
or ksoftirqd can be wakeup earlier under pressure.

This was developed while testing an alternative to RX interrupt
mitigation to reduce latencies while keeping or improving GRO
aggregation on fast NIC.

Idea is to test napi->gro_list at the end of a napi->poll() and
reschedule one NAPI poll, but after servicing a full round of
softirqs (timers, TX, rcu, ...). This will be allowed only if softirq
is currently serviced by idle task or ksoftirqd, and resched not needed.

Signed-off-by: Eric Dumazet <edumazet@google.com>
Cc: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2014-11-03 12:25:09 -05:00
..
6lowpan 6lowpan: Allow 6LoWPAN to be modular 2014-08-07 11:44:18 -07:00
9p 9p/trans_virtio: enable VQs early 2014-10-15 10:25:04 +10:30
802 net: set name_assign_type in alloc_netdev() 2014-07-15 16:12:48 -07:00
8021q net: better IFF_XMIT_DST_RELEASE support 2014-10-07 13:22:11 -04:00
appletalk Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-07-16 14:09:34 -07:00
atm net: better IFF_XMIT_DST_RELEASE support 2014-10-07 13:22:11 -04:00
ax25
batman-adv batman-adv: replace strnicmp with strncasecmp 2014-10-14 02:18:24 +02:00
bluetooth Bluetooth: 6lowpan: Check transmit errors for multicast packets 2014-10-02 13:41:57 +03:00
bridge Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-01 14:53:27 -04:00
caif caif_usb: use target structure member in memset 2014-10-14 16:05:45 -04:00
can
ceph Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2014-10-15 06:46:01 +02:00
core net: less interrupt masking in NAPI 2014-11-03 12:25:09 -05:00
dcb dcbnl : Fix misleading dcb_app->priority explanation 2014-07-30 17:21:05 -07:00
dccp Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-10-18 09:31:37 -07:00
decnet af_decnet: Use time_after_eq 2014-08-22 12:23:11 -07:00
dns_resolver Merge commit 'v3.16' into next 2014-10-01 00:44:04 +10:00
dsa Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-01 14:53:27 -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 Merge tag 'master-2014-10-02' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wireless-next 2014-10-05 21:34:39 -04:00
ipv4 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-01 14:53:27 -04:00
ipv6 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-11-01 14:53:27 -04:00
ipx ipx: remove all unnecessary castings on ntohl 2014-10-30 15:51:43 -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 lapb: move EXPORT_SYMBOL after functions. 2014-10-24 15:51:42 -04:00
llc net: llc: include linux/errno.h instead of asm/errno.h 2014-10-24 15:51:42 -04:00
mac80211 mac80211: minstrels: fix buffer overflow in HT debugfs rc_stats 2014-10-20 16:37:01 +02:00
mac802154 Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2014-10-08 21:40:54 -04:00
mpls mpls: Allow mpls_gso to be built as module 2014-10-31 15:47:21 -04:00
netfilter ipvs: Avoid null-pointer deref in debug code 2014-10-28 09:48:31 +09:00
netlabel netlabel: kernel-doc warning fix 2014-10-09 01:40:05 -04:00
netlink netlink: Re-add locking to netlink_lookup() and seq walker 2014-10-21 21:34:49 -04:00
netrom netrom: use linux/uaccess.h 2014-10-17 23:52:54 -04:00
nfc NFC: nci: Add support for proprietary RF Protocols 2014-09-24 02:02:24 +02:00
openvswitch openvswitch: Export lockdep_ovsl_is_held to modules. 2014-10-28 17:27:23 -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: fix rcu access on phonet_routes 2014-10-06 18:16:30 -04:00
rds Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2014-10-18 09:31:37 -07:00
rfkill net: rfkill: kernel-doc warning fixes 2014-10-09 11:16:15 +02:00
rose rose: use %*ph specifier 2014-09-07 16:07:25 -07:00
rxrpc Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris/linux-security 2014-10-12 10:13:55 -04:00
sched sch_pie: schedule the timer after all init succeed 2014-10-29 14:28:01 -04:00
sctp sctp: replace seq_printf with seq_puts 2014-10-30 19:40:16 -04:00
sunrpc Merge branch 'for-3.18' of git://linux-nfs.org/~bfields/linux 2014-10-08 12:51:44 -04:00
tipc tipc: spelling errors 2014-10-30 16:56:41 -04:00
unix af_unix: remove 0 assignment on static 2014-10-07 17:03:14 -04:00
vmw_vsock
wimax wimax: convert printk to pr_foo() 2014-10-07 20:28:44 -04:00
wireless Here are a few fixes for the wireless stack: one fixes the 2014-10-27 13:38:15 -04:00
x25
xfrm net: skb_fclone_busy() needs to detect orphaned skb 2014-10-30 19:58:30 -04:00
compat.c net: sendmsg: fix NULL pointer dereference 2014-07-29 12:20:22 -07:00
Kconfig bpf: split eBPF out of NET 2014-10-27 19:09:59 -04:00
Makefile 6lowpan: introduce new net/6lowpan directory 2014-07-12 01:53:30 +02:00
nonet.c
socket.c File locking related changes for v3.18 (pile #1) 2014-10-11 13:21:34 -04:00
sysctl_net.c