Eric Dumazet 79eb15da3c
ipv4: add net_hash_mix() dispersion to fib_info_laddrhash keys ...
net/ipv4/fib_semantics.c uses a hash table (fib_info_laddrhash)
in which fib_sync_down_addr() can locate fib_info
based on IPv4 local address.
This hash table is resized based on total number of
hashed fib_info, but the hash function is only
using the local address.
For hosts having many active network namespaces,
all fib_info for loopback devices (IPv4 address 127.0.0.1)
are hashed into a single bucket, making netns dismantles
very slow.
Signed-off-by: Eric Dumazet <edumazet@google.com >
Reviewed-by: David Ahern <dsahern@kernel.org >
Signed-off-by: Jakub Kicinski <kuba@kernel.org >
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79eb15da3c