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Eric Dumazet acb32ba3de ipv4: reduce percpu needs for icmpmsg mibs 
Reading /proc/net/snmp on a machine with a lot of cpus is very expensive
(can be ~88000 us).

This is because ICMPMSG MIB uses 4096 bytes per cpu, and folding values
for all possible cpus can read 16 Mbytes of memory.

ICMP messages are not considered as fast path on a typical server, and
eventually few cpus handle them anyway. We can afford an atomic
operation instead of using percpu data.

This saves 4096 bytes per cpu and per network namespace.

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
2011-11-09 16:04:20 -05:00
..
acpi Merge branch 'release' of git://git.kernel.org/pub/scm/linux/kernel/git/lenb/linux 2011-11-07 10:13:52 -08:00
asm-generic Merge Qualcom Hexagon architecture 2011-11-01 07:48:13 -07:00
crypto crypto: Add a report function pointer to crypto_type 2011-10-21 14:24:03 +02:00
drm Merge branch 'drm-fixes' of git://people.freedesktop.org/~airlied/linux 2011-11-07 10:01:56 -08:00
keys encrypted-keys: add key format support 2011-06-27 09:10:45 -04:00
linux Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net 2011-11-07 10:55:33 -08:00
math-emu
media Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
misc [media] altera-stapl: it is time to move out from staging 2011-09-23 15:00:57 -03:00
mtd mtd: kill old field for `struct mtd_info_user' 2011-09-11 15:57:44 +03:00
net ipv4: reduce percpu needs for icmpmsg mibs 2011-11-09 16:04:20 -05:00
pcmcia pcmcia: add PCMCIA_DEVICE_MANF_CARD_PROD_ID3 2011-08-08 16:04:11 -04:00
rdma Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/roland/infiniband 2011-11-01 10:51:38 -07:00
rxrpc atomic: use <linux/atomic.h> 2011-07-26 16:49:47 -07:00
scsi Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6 2011-10-28 16:44:18 -07:00
sound Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
target Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending 2011-11-06 19:00:42 -08:00
trace Merge branch 'modsplit-Oct31_2011' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg/linux 2011-11-06 19:44:47 -08:00
video Merge branch 'for-florian' of git://gitorious.org/linux-omap-dss2/linux into fbdev-next 2011-10-15 00:19:52 +00:00
xen Merge branch 'upstream/xen-settime' of git://git.kernel.org/pub/scm/linux/kernel/git/jeremy/xen 2011-11-06 20:15:05 -08:00
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