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

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Message-Id: <20061108.184353.106435332.davem@davemloft.net>
Date:	Wed, 08 Nov 2006 18:43:53 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	jesse.brandeburg@...il.com
Cc:	jmerkey@...eranetworks.com, linux-kernel@...r.kernel.org,
	netdev@...r.kernel.org
Subject: Re: e1000 driver 2.6.18 - how to waste processor cycles

From: "Jesse Brandeburg" <jesse.brandeburg@...il.com>
Date: Wed, 8 Nov 2006 17:01:44 -0800

> If you can show that it is faster to use pci_dma_sync_single_for_cpu
> and friends I'd be glad to take a patch.

The problem is if you don't recycle the buffer and really unmap,
you'll flush twice.  That can potentially be expensive.
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