From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751243Ab2LWFAl (ORCPT ); Sun, 23 Dec 2012 00:00:41 -0500 Received: from terminus.zytor.com ([198.137.202.10]:49601 "EHLO mail.zytor.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750728Ab2LWFAj (ORCPT ); Sun, 23 Dec 2012 00:00:39 -0500 Message-ID: <50D68FDC.6020700@zytor.com> Date: Sat, 22 Dec 2012 21:00:12 -0800 From: "H. Peter Anvin" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0 MIME-Version: 1.0 To: Yinghai Lu CC: Konrad Rzeszutek Wilk , Thomas Gleixner , Ingo Molnar , "Eric W. Biederman" , Andrew Morton , linux-kernel@vger.kernel.org Subject: Re: [PATCH v6 24/27] x86: Add swiotlb force off support References: <1355436141-8668-1-git-send-email-yinghai@kernel.org> <1355436141-8668-25-git-send-email-yinghai@kernel.org> <20121222021813.GC3468@phenom.dumpdata.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/21/2012 09:00 PM, Yinghai Lu wrote: > On Fri, Dec 21, 2012 at 6:18 PM, Konrad Rzeszutek Wilk > wrote: >> On Thu, Dec 13, 2012 at 02:02:18PM -0800, Yinghai Lu wrote: >>> So use could disable swiotlb from command line, even swiotlb support >>> is compiled in. Just like we have intel_iommu=on and intel_iommu=off. >> >> Does this have any usage besides testing? > > for kdump. > "For kdump" isn't an answer. There is a reason why kdump needs this. -hpa -- H. Peter Anvin, Intel Open Source Technology Center I work for Intel. I don't speak on their behalf.