linux-kernel - e1000 driver 2.6.18 - how to waste processor cycles

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Message-ID: <45524E3A.7080301@soleranetworks.com>
Date:	Wed, 08 Nov 2006 14:38:02 -0700
From:	"Jeff V. Merkey" <jmerkey@...eranetworks.com>
To:	Linux kernel <linux-kernel@...r.kernel.org>
Subject: e1000 driver 2.6.18 - how to waste processor cycles

Is there a good reason the skb refill routine in e1000_alloc_rx_buffers 
needs to go and touch and remap skb memory
on already loaded descriptors/  This seems extremely wasteful of 
processor cycles when refilling the ring buffer.

I note that the archtiecture has changed and is recycling buffers from 
the rx_irq routine and when the routine is called
to refill the ring buffers, a lot of wasteful and needless calls for 
map_skb is occurring.

Jeff
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