From mboxrd@z Thu Jan  1 00:00:00 1970
From: David Miller <davem@davemloft.net>
Subject: Re: [Patch net-next v2] net_sched: get rid of rcu_barrier() in
 tcf_block_put_ext()
Date: Tue, 05 Dec 2017 14:53:51 -0500 (EST)
Message-ID: <20171205.145351.1857165643121726050.davem@davemloft.net>
References: <20171204184818.23960-1-xiyou.wangcong@gmail.com>
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Cc: netdev@vger.kernel.org, pabeni@redhat.com, edumazet@google.com,
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From: Cong Wang <xiyou.wangcong@gmail.com>
Date: Mon,  4 Dec 2017 10:48:18 -0800

> Both Eric and Paolo noticed the rcu_barrier() we use in
> tcf_block_put_ext() could be a performance bottleneck when
> we have a lot of tc classes.
> 
> Paolo provided the following to demonstrate the issue:
 ...
> Tested-by: Paolo Abeni <pabeni@redhat.com>
> Cc: Eric Dumazet <edumazet@google.com>
> Cc: Jiri Pirko <jiri@mellanox.com>
> Cc: Jamal Hadi Salim <jhs@mojatatu.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@gmail.com>

Applied.