Re: [PATCH net-next] net: speed up skb_rbtree_purge()
From: David Miller <davem@davemloft.net>
Date: 2017-09-26 03:36:12
From: Eric Dumazet <redacted> Date: Sat, 23 Sep 2017 12:39:12 -0700
From: Eric Dumazet <edumazet@google.com>
As measured in my prior patch ("sch_netem: faster rb tree removal"),
rbtree_postorder_for_each_entry_safe() is nice looking but much slower
than using rb_next() directly, except when tree is small enough
to fit in CPU caches (then the cost is the same)
Also note that there is not even an increase of text size :
$ size net/core/skbuff.o.before net/core/skbuff.o
text data bss dec hex filename
40711 1298 0 42009 a419 net/core/skbuff.o.before
40711 1298 0 42009 a419 net/core/skbuff.o
From: Eric Dumazet <edumazet@google.com>Applied.