• Eric Dumazet's avatar
    fib_hash: RCU conversion phase 2 · 19f57256
    Eric Dumazet authored
    Get rid of fib_hash_lock rwlock.
    
    The fn_zone hash table resize is the noticeable part of this patch.
    
    I added a seqlock per fn_zone, so that readers can restart their lookup
    in the (very rare) case a writer expanded the hash table.
    
    Add rcu heads in fib_alias and fib_node, use call_rcu() to defer their
    freeing, and use appropriate _rcu list manipulations.
    
    Stress test (160.000.000 udp frames sent, IP route cache disabled to
    mimic DDOS attack, FIB_HASH)
    
    Before:
    real	0m41.191s
    user	0m13.137s
    sys	8m55.241s
    
    After:
    real	0m38.091s
    user	0m13.189s
    sys	7m53.018s
    Signed-off-by: default avatarEric Dumazet <eric.dumazet@gmail.com>
    Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
    19f57256
fib_lookup.h 1.44 KB