netdev - Re: [net-next-2.6 PATCH 3/4] igb: Record host memory receive overflow in net

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Date:	Tue, 26 May 2009 20:36:24 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	jeffrey.t.kirsher@...el.com
Cc:	netdev@...r.kernel.org, hawk@...x.dk
Subject: Re: [net-next-2.6 PATCH 3/4] igb: Record host memory receive
 overflow in net_stats

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Tue, 26 May 2009 16:50:48 -0700

> Based on previous patch from Jesper Dangaard Brouer.
> 
> The RNBC (Receive No Buffers Count) register for the 82576, indicate
> that frames were received when there were no available buffers in host
> memory to store those frames (receive descriptor head and tail
> pointers were equal).  The packet is still received by the NIC if
> there is space in the FIFO on the NIC.
> 
> As the RNBC value is not a packet drop, the driver stores this value
> in net_stats.rx_fifo_errors to indicate that there were no system
> buffers available for the incoming packet.  Actual dropped packets
> are counted in the MPC value.
> 
> Saving the stats in dev->net_stats makes it visible via
> /proc/net/dev as "fifo", and thus viewable to ifconfig
> as "overruns" and 'netstat -i' as "RX-OVR".
> 
> The Receive No Buffers Count (RNBC) can already be queried by
> ethtool -S as "rx_no_buffer_count".
> 
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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