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Date: Wed, 19 Jan 2022 08:40:54 -0700 From: David Ahern <dsahern@...il.com> To: Eric Dumazet <eric.dumazet@...il.com>, "David S . Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org> Cc: David Ahern <dsahern@...nel.org>, netdev <netdev@...r.kernel.org>, Eric Dumazet <edumazet@...gle.com> Subject: Re: [PATCH v2 net 2/2] ipv4: add net_hash_mix() dispersion to fib_info_laddrhash keys On 1/19/22 3:04 AM, Eric Dumazet wrote: > From: Eric Dumazet <edumazet@...gle.com> > > 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@...gle.com> > --- > net/ipv4/fib_semantics.c | 29 +++++++++++++++-------------- > 1 file changed, 15 insertions(+), 14 deletions(-) > Reviewed-by: David Ahern <dsahern@...nel.org>
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