netdev - Re: [PATCH net-next v5 07/10] forcedeth: implement ndo_get

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Message-ID: <20111116085533.0982001e@s6510.linuxnetplumber.net>
Date:	Wed, 16 Nov 2011 08:55:33 -0800
From:	Stephen Hemminger <shemminger@...tta.com>
To:	David Decotigny <david.decotigny@...gle.com>
Cc:	netdev@...r.kernel.org, linux-kernel@...r.kernel.org,
	"David S. Miller" <davem@...emloft.net>,
	Ian Campbell <ian.campbell@...rix.com>,
	Eric Dumazet <eric.dumazet@...il.com>,
	Jeff Kirsher <jeffrey.t.kirsher@...el.com>,
	Ben Hutchings <bhutchings@...arflare.com>,
	Jiri Pirko <jpirko@...hat.com>, Joe Perches <joe@...ches.com>,
	Szymon Janc <szymon@...c.net.pl>,
	Richard Jones <rick.jones2@...com>,
	Ayaz Abdulla <AAbdulla@...dia.com>
Subject: Re: [PATCH net-next v5 07/10] forcedeth: implement
 ndo_get_stats64() API

On Tue, 15 Nov 2011 21:15:55 -0800
David Decotigny <david.decotigny@...gle.com> wrote:

> This commit implements the ndo_get_stats64() API for forcedeth. Since
> these stats are being updated from different contexts (process and
> timer), this commit adds protection (locking + atomic variables).
> 
> Tested:
>   - 16-way SMP x86_64 ->
>     RX bytes:7244556582 (7.2 GB)  TX bytes:181904254 (181.9 MB)
>   - pktgen + loopback: identical rx_bytes/tx_bytes and rx_packets/tx_packets

Rather than adding additional locking why not use a percpu structure
to hold statistics. See loopback, macvlan, veth, xen-netfront.

Or realize that the Tx side is single threaded by dev->xmit_lock already
and the Rx side is single threaded by NAPI.
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