netdev - Re: [PATCH v3 net-next-2.6] netfilter: x_tables: dont block BH while reading counters

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Message-ID: <20101216095740.301b6acc@nehalam>
Date:	Thu, 16 Dec 2010 09:57:40 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Jesper Dangaard Brouer <hawk@...x.dk>,
	Patrick McHardy <kaber@...sh.net>,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Steven Rostedt <srostedt@...hat.com>,
	Alexander Duyck <alexander.h.duyck@...el.com>,
	netfilter-devel <netfilter-devel@...r.kernel.org>,
	netdev <netdev@...r.kernel.org>,
	Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@...el.com>
Subject: Re: [PATCH v3 net-next-2.6] netfilter: x_tables: dont block BH
 while reading counters

On Thu, 16 Dec 2010 18:53:06 +0100
Eric Dumazet <eric.dumazet@...il.com> wrote:

> [PATCH v3 net-next-2.6] netfilter: x_tables: dont block BH while reading counters
> 
> Using "iptables -L" with a lot of rules might have a too big BH latency.
> Jesper mentioned ~6 ms and worried of frame drops.
> 
> Switch to a per_cpu seqcount scheme, so that taking a snapshot of
> counters doesnt need to block BH (for this cpu, but also other cpus).
> 
> Reported-by: Jesper Dangaard Brouer <hawk@...x.dk>
> Signed-off-by: Eric Dumazet <eric.dumazet@...il.com>

Acked-by: Stephen Hemminger <shemminger@...tta.com>

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