Eric Dumazet 4b0b72f7dd net: speedup udp receive path ... Since commit 95766fff ([UDP]: Add memory accounting.), each received packet needs one extra sock_lock()/sock_release() pair. This added latency because of possible backlog handling. Then later, ticket spinlocks added yet another latency source in case of DDOS. This patch introduces lock_sock_bh() and unlock_sock_bh() synchronization primitives, avoiding one atomic operation and backlog processing. skb_free_datagram_locked() uses them instead of full blown lock_sock()/release_sock(). skb is orphaned inside locked section for proper socket memory reclaim, and finally freed outside of it. UDP receive path now take the socket spinlock only once. Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2010-04-28 14:35:48 -07:00
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acpi	…
asm-generic	…
crypto	crypto: md5 - Add export support	2010-01-17 21:55:31 +11:00
drm	Merge branch 'drm-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6	2010-04-19 07:27:06 -07:00
keys	…
linux	caif: Rewritten socket implementation	2010-04-28 12:55:14 -07:00
math-emu	…
media	Merge branch 'for-next' into for-linus	2010-03-08 16:55:37 +01:00
mtd	…
net	net: speedup udp receive path	2010-04-28 14:35:48 -07:00
pcmcia	…
rdma	…
rxrpc	…
scsi	…
sound	…
trace	Merge branch 'for-linus' of git://git.kernel.dk/linux-2.6-block	2010-04-09 11:50:29 -07:00
video	…
xen	…
Kbuild	…