Eric Dumazet d26b3a7c4b ipv4: percpu nh_rth_output cache ... Input path is mostly run under RCU and doesnt touch dst refcnt But output path on forwarding or UDP workloads hits badly dst refcount, and we have lot of false sharing, for example in ipv4_mtu() when reading rt->rt_pmtu Using a percpu cache for nh_rth_output gives a nice performance increase at a small cost. 24 udpflood test on my 24 cpu machine (dummy0 output device) (each process sends 1.000.000 udp frames, 24 processes are started) before : 5.24 s after : 2.06 s For reference, time on linux-3.5 : 6.60 s Signed-off-by: Eric Dumazet <edumazet@google.com> Tested-by: Alexander Duyck <alexander.h.duyck@intel.com> Signed-off-by: David S. Miller <davem@davemloft.net>		2012-07-31 14:41:39 -07:00
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acpi	Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux	2012-07-26 14:28:55 -07:00
asm-generic	Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm	2012-07-27 15:14:26 -07:00
crypto
drm	Merge branch 'drm-nouveau-fixes' of git://anongit.freedesktop.org/git/nouveau/linux-2.6 into drm-next	2012-07-26 10:35:44 +10:00
keys
linux	Merge branch 'for-linus' of git://git.linaro.org/people/rmk/linux-arm	2012-07-27 15:14:26 -07:00
math-emu
media
memory
misc
mtd
net	ipv4: percpu nh_rth_output cache	2012-07-31 14:41:39 -07:00
pcmcia
rdma	Merge branches 'cma', 'cxgb4', 'misc', 'mlx4-sriov', 'mlx-cleanups', 'ocrdma' and 'qib' into for-linus	2012-07-22 23:26:17 -07:00
rxrpc
scsi	Merge branch 'master' [vanilla Linus master] into libata-dev.git/upstream	2012-07-25 15:58:48 -04:00
sound	Merge branch 'topic/pm-convert' into for-next	2012-07-19 08:21:57 +02:00
target	target: Allow for target_submit_cmd() returning errors	2012-07-17 17:05:05 -07:00
trace	Merge branch 'x86-mm-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2012-07-26 13:17:17 -07:00
video
xen	xen PVonHVM: move shared_info to MMIO before kexec	2012-07-19 15:52:05 -04:00
Kbuild