netdev - Re: [Bridge] [PATCH] bridge: per-cpu packet statistics

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Message-ID: <20100302092301.7ca9b368@nehalam>
Date:	Tue, 2 Mar 2010 09:23:01 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	netdev@...r.kernel.org, bridge@...ts.linux-foundation.org,
	David Miller <davem@...emloft.net>
Subject: Re: [Bridge] [PATCH]  bridge: per-cpu packet statistics

On Tue, 02 Mar 2010 10:02:59 +0100
Eric Dumazet <eric.dumazet@...il.com> wrote:

> From: Stephen Hemminger <shemminger@...tta.com>
> 
> Le lundi 01 mars 2010 à 16:16 -0800, Stephen Hemminger a écrit :
> 
> > +	for_each_online_cpu(cpu) {
> > +		const struct br_cpu_netstats *bstats
> > +			= per_cpu_ptr(br->stats, cpu);
> > +
> > +		stats->rx_bytes   += bstats->rx_bytes;
> > +		stats->rx_packets += bstats->rx_packets;
> > +	}
> 
> And last point, we should use for_each_possible_cpu() here
> 
> Here is your patch with all my comments integrated :
> 
> 1) Use txq->{tx_bytes|tx_packets} counter
> 
> 2) alloc_percpu(struct ...) instead of alloc_percpu(sizeof(struct ...))
> 
> 3) free_netdev() in destructor
> 
> 4) for_each_possible_cpu() instead of for_each_online_cpu()
> 
> 5) br_get_stats() use local variables for the sake of concurrent users

No need, bridge has no queue!
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