netdev - Re: [PATCH net-next] net: speed up skb_rbtree

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Message-Id: <20170925.203611.1769058727594321517.davem@davemloft.net>
Date:   Mon, 25 Sep 2017 20:36:11 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org
Subject: Re: [PATCH net-next] net: speed up skb_rbtree_purge()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 23 Sep 2017 12:39:12 -0700

> From: Eric Dumazet <edumazet@...gle.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@...gle.com>

Applied.