netdev - Re: [PATCH] mlx4_en: map entire pages to increase throughput

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Message-Id: <20120717.055005.1912765690890797652.davem@davemloft.net>
Date:	Tue, 17 Jul 2012 05:50:05 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	David.Laight@...LAB.COM
Cc:	rick.jones2@...com, cascardo@...ux.vnet.ibm.com,
	netdev@...r.kernel.org, yevgenyp@...lanox.co.il,
	ogerlitz@...lanox.com, amirv@...lanox.com,
	brking@...ux.vnet.ibm.com, leitao@...ux.vnet.ibm.com,
	klebers@...ux.vnet.ibm.com
Subject: Re: [PATCH] mlx4_en: map entire pages to increase throughput

From: "David Laight" <David.Laight@...LAB.COM>
Date: Tue, 17 Jul 2012 13:42:04 +0100

> Would there be any mileage in permanently allocating IOMMU
> virtual address to the ring entries, then 'just' assigning
> the correct physical address during rx/tx setup?

There is a not a one to one mapping between these two entities,
in particular on the transmit side.

A transmit packet can have multiple segments, some of which are
larger than one IOMMU page.
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