netdev - Re: [PATCH v3 net-next 7/7] net_sched: act_mirred: remove spinlock in fast path

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Message-ID: <559AC925.3020703@plumgrid.com>
Date:	Mon, 06 Jul 2015 11:29:57 -0700
From:	Alexei Starovoitov <ast@...mgrid.com>
To:	Eric Dumazet <edumazet@...gle.com>,
	"David S. Miller" <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>,
	Jamal Hadi Salim <jhs@...atatu.com>,
	John Fastabend <john.fastabend@...il.com>,
	Eric Dumazet <edumazet@...il.com>
Subject: Re: [PATCH v3 net-next 7/7] net_sched: act_mirred: remove spinlock
 in fast path

On 7/6/15 5:18 AM, Eric Dumazet wrote:
> Like act_gact, act_mirred can be lockless in packet processing
>
> 1) Use percpu stats
> 2) update lastuse only every clock tick to avoid false sharing
> 3) use rcu to protect tcfm_dev
> 4) Remove spinlock usage, as it is no longer needed.
>
> Next step : add multi queue capability to ifb device
>
> Signed-off-by: Eric Dumazet<edumazet@...gle.com>

Nice!
Acked-by: Alexei Starovoitov <ast@...mgrid.com>

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