netdev - Re: [PATCH v3 net-next 6/7] net: do not block BH while processing socket backlog

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Date:	Fri, 29 Apr 2016 14:47:10 -0700
From:	Alexei Starovoitov <ast@...com>
To:	Eric Dumazet <edumazet@...gle.com>,
	"David S . Miller" <davem@...emloft.net>
CC:	netdev <netdev@...r.kernel.org>,
	Soheil Hassas Yeganeh <soheil@...gle.com>,
	Marcelo Ricardo Leitner <marcelo.leitner@...il.com>,
	Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH v3 net-next 6/7] net: do not block BH while processing
 socket backlog

On 4/29/16 2:16 PM, Eric Dumazet wrote:
> Socket backlog processing is a major latency source.
>
> With current TCP socket sk_rcvbuf limits, I have sampled __release_sock()
> holding cpu for more than 5 ms, and packets being dropped by the NIC
> once ring buffer is filled.
>
> All users are now ready to be called from process context,
> we can unblock BH and let interrupts be serviced faster.
>
> cond_resched_softirq() could be removed, as it has no more user.
>
> Signed-off-by: Eric Dumazet<edumazet@...gle.com>
> Acked-by: Soheil Hassas Yeganeh<soheil@...gle.com>

Acked-by: Alexei Starovoitov <ast@...nel.org>