netdev - Re: [PATCH net-next] r8169: Add 64bit statistics

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Date:	Sun, 04 Mar 2012 15:32:16 -0800
From:	Eric Dumazet <eric.dumazet@...il.com>
To:	Francois Romieu <romieu@...zoreil.com>
Cc:	Junchang Wang <junchangwang@...il.com>, davem@...emloft.net,
	netdev@...r.kernel.org
Subject: Re: [PATCH net-next] r8169: Add 64bit statistics

Le lundi 05 mars 2012 à 00:24 +0100, Francois Romieu a écrit :
> Eric Dumazet <eric.dumazet@...il.com> :
> [...]
> > small point : Using this means you have a 32bit hole here (on 32bit
> > build). Its minor, you dont need to change.
> 
> Ok.
> 
> [...]
> > 	You could try to put these somewhere else, to try to keep this portion
> > as read only memory, to be more SMP friendly.
> > (Some loaded server could have one CPU serving RX stuff, and other cpus
> > doing TX stuff) 
> 
> Point taken. It could make sense to rework the rtl8169_private struct a bit
> more.
> 
> [...]
> > > @@ -6070,20 +6084,49 @@ static void rtl_set_rx_mode(struct net_device *dev)
> > >  }
> > >  
> > >  /**
> > > - *  rtl8169_get_stats - Get rtl8169 read/write statistics
> > > + *  rtl8169_get_stats64 - Get rtl8169 read/write statistics
> > >   *  @dev: The Ethernet Device to get statistics for
> > 
> > missing @stats
> 
> This documentation is almost useless anyway. I removed it.
> 
> [...]
> > You dont need _bytes and _packets temp variables, as @stats points to a
> > private memory, we can use it as working storage, just do :
> > 
> >        do {
> >                start = u64_stats_fetch_begin_bh(&tp->rx_stats.syncp);
> >                stats->rx_packets = tp->rx_stats.packets;
> >                stats->rx_bytes = tp->rx_stats.bytes;
> >        } while (u64_stats_fetch_retry_bh(&tp->rx_stats.syncp, start));
> 
> It should give something like the patch below.
> 
> If I understand correctly we do not care much about the error counters,
> right ?
> 
> From: Junchang Wang <junchangwang@...il.com>
> Date: Sun, 4 Mar 2012 23:30:32 +0100
> Subject: [PATCH 1/2] r8169: add 64bit statistics.
> 
> Switch to use ndo_get_stats64 to get 64bit statistics.
> Two sync entries are used (one for Rx and one for Tx).
> 
> Signed-off-by: Junchang Wang <junchangwang@...il.com>
> Reviewed-by: Eric Dumazet <eric.dumazet@...il.com>
> Signed-off-by: Francois Romieu <romieu@...zoreil.com>
> ---
>  drivers/net/ethernet/realtek/r8169.c |   59 ++++++++++++++++++++++++++--------
>  1 files changed, 45 insertions(+), 14 deletions(-)
> 

Seems Good To Me, thanks !


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