Re: [PATCH net-next v5 07/10] forcedeth: implementndo_get_stats64() API

[Stephen Hemminger]

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