netdev - Re: [Patch net-next v2] net_sched: get rid of rcu_barrier() in tcf_block_put

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Date:   Tue, 05 Dec 2017 14:53:51 -0500 (EST)
From:   David Miller <davem@...emloft.net>
To:     xiyou.wangcong@...il.com
Cc:     netdev@...r.kernel.org, pabeni@...hat.com, edumazet@...gle.com,
        jiri@...lanox.com, jhs@...atatu.com
Subject: Re: [Patch net-next v2] net_sched: get rid of rcu_barrier() in
 tcf_block_put_ext()

From: Cong Wang <xiyou.wangcong@...il.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@...hat.com>
> Cc: Eric Dumazet <edumazet@...gle.com>
> Cc: Jiri Pirko <jiri@...lanox.com>
> Cc: Jamal Hadi Salim <jhs@...atatu.com>
> Signed-off-by: Cong Wang <xiyou.wangcong@...il.com>

Applied.