From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759420AbZBLOs1 (ORCPT ); Thu, 12 Feb 2009 09:48:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1756312AbZBLOsQ (ORCPT ); Thu, 12 Feb 2009 09:48:16 -0500 Received: from 8bytes.org ([88.198.83.132]:37018 "EHLO 8bytes.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753084AbZBLOsP (ORCPT ); Thu, 12 Feb 2009 09:48:15 -0500 Date: Thu, 12 Feb 2009 15:48:13 +0100 From: Joerg Roedel To: Chris Wright Cc: David Woodhouse , linux-kernel@vger.kernel.org, fujita.tomonori@lab.ntt.co.jp, iommu@lists.linux-foundation.org, mingo@redhat.com, netdev@vger.kernel.org Subject: Re: [PATCH 0/16] DMA-API debugging facility v2 Message-ID: <20090212144813.GA2125@8bytes.org> References: <1231517970-20288-1-git-send-email-joerg.roedel@amd.com> <1233874352.8135.12.camel@macbook.infradead.org> <20090206020535.GE27684@sequoia.sous-sol.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090206020535.GE27684@sequoia.sous-sol.org> User-Agent: Mutt/1.5.18 (2008-05-17) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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