netdev - Re: [PATCH net-next] sch_netem: faster rb tree removal

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Date:   Mon, 25 Sep 2017 20:33:49 -0700 (PDT)
From:   David Miller <davem@...emloft.net>
To:     eric.dumazet@...il.com
Cc:     netdev@...r.kernel.org, stephen@...workplumber.org
Subject: Re: [PATCH net-next] sch_netem: faster rb tree removal

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Sat, 23 Sep 2017 11:07:28 -0700

> From: Eric Dumazet <edumazet@...gle.com>
> 
> While running TCP tests involving netem storing millions of packets,
> I had the idea to speed up tfifo_reset() and did experiments.
> 
> I tried the rbtree_postorder_for_each_entry_safe() method that is
> used in skb_rbtree_purge() but discovered it was slower than the
> current tfifo_reset() method.
> 
> I measured time taken to release skbs with three occupation levels :
> 10^4, 10^5 and 10^6 skbs with three methods :
 ...
> Results :
 ...
> I will also change skb_rbtree_purge() in a second patch.
> 
> Signed-off-by: Eric Dumazet <edumazet@...gle.com>

Applied, thanks Eric.