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authorEric Dumazet <eric.dumazet@gmail.com>2011-11-13 05:24:04 +0400
committerDavid S. Miller <davem@davemloft.net>2011-11-14 09:12:26 +0400
commit2a24444f8f2bea694003e3eac5c2f8d9a386bdc5 (patch)
treeef283db22c931c518ac6c0b8bca2e23dd62a7736 /net/ieee802154
parent3d249d4ca7d0ed6629a135ea1ea21c72286c0d80 (diff)
downloadlinux-2a24444f8f2bea694003e3eac5c2f8d9a386bdc5.tar.xz
ipv6: reduce percpu needs for icmpv6msg mibs
Reading /proc/net/snmp6 on a machine with a lot of cpus is very expensive (can be ~88000 us). This is because ICMPV6MSG MIB uses 4096 bytes per cpu, and folding values for all possible cpus can read 16 Mbytes of memory (32MBytes on non x86 arches) 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>
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