netdev - Re: [net-next-2.6 PATCH 2/4] igb: Implement reading of reg RQDPC (Receive Queue Drop Packet Count)

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Date:	Tue, 26 May 2009 20:36:15 -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 2/4] igb: Implement reading of reg RQDPC
 (Receive Queue Drop Packet Count)

From: Jeff Kirsher <jeffrey.t.kirsher@...el.com>
Date: Tue, 26 May 2009 16:50:31 -0700

> Based on the previous patches from Jesper Dangaard Brouer <hawk@...x.dk>
> 
> Implement reading the per queue drop stats register
> RQDPC (Receive Queue Drop Packet Count).  It counts the number of
> packets dropped by a queue due to lack of descriptors available.
> 
> Notice RQDPC (Receive Queue Drop Packet Count) stats only gets
> incremented, if the DROP_EN bit it set (in the SRRCTL register
> for that queue).  If DROP_EN bit is NOT set, then the some what
> equivalent count is stored in RNBC (not per queue basis).
> 
> The RQDPC register is only 12 bit, thus the precision might
> suffer due to overrun in-netween the watchdog polling interval.
> 
> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@...el.com>

Applied.
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