netdev - Re: [PATCH 0/16] DMA-API debugging facility v2

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Message-ID: <20090212144813.GA2125@8bytes.org>
Date:	Thu, 12 Feb 2009 15:48:13 +0100
From:	Joerg Roedel <joro@...tes.org>
To:	Chris Wright <chrisw@...s-sol.org>
Cc:	David Woodhouse <dwmw2@...radead.org>,
	linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
	iommu@...ts.linux-foundation.org, mingo@...hat.com,
	netdev@...r.kernel.org
Subject: Re: [PATCH 0/16] DMA-API debugging facility v2

On Thu, Feb 05, 2009 at 06:05:35PM -0800, Chris Wright wrote:

> (interesting hash_fn spread ;-)

Hmm, thats because all device addresses are 16kb aligned. The hashfn
uses bits 13 to 21 as the index for the hash. I can move this window up
to bits 18-26 if it improves the hash spread.

Joerg
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