Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751613AbdI1QAu (ORCPT ); Thu, 28 Sep 2017 12:00:50 -0400 Received: from mga05.intel.com ([192.55.52.43]:10191 "EHLO mga05.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750821AbdI1QAt (ORCPT ); Thu, 28 Sep 2017 12:00:49 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.42,450,1500966000"; d="scan'208";a="140548578" Date: Thu, 28 Sep 2017 06:05:50 -0700 From: "Raj, Ashok" To: Harsh Jain Cc: Casey Leedom , Robin Murphy , Dan Williams , Herbert Xu , "linux-kernel@vger.kernel.org" , "iommu@lists.linux-foundation.org" , "linux-crypto@vger.kernel.org" , "dwmw2@infradead.org" , Michael Werner , "nd@arm.com" Subject: Re: DMA error when sg->offset value is greater than PAGE_SIZE in Intel IOMMU Message-ID: <20170928130549.GA99456@otc-nc-03> References: <6d2af675-7b97-6eaf-4daa-d7bf80a05923@chelsio.com> <437a9bd8-d4d6-22ca-1a64-1a3e73f1101a@arm.com> <20170927181802.3dcd7efb@m750.lan> <20170927144847.GA95654@otc-nc-03> <26d68681-a157-26d3-84cb-6684dcaf3135@chelsio.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <26d68681-a157-26d3-84cb-6684dcaf3135@chelsio.com> User-Agent: Mutt/1.5.24 (2015-08-30) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 347 Lines: 11 Thanks for trying that Harsh. sp_off turns of super page support. Which this mode, do you still see offsets greater than 4k? On Thu, Sep 28, 2017 at 07:08:21PM +0530, Harsh Jain wrote: > > > Today I tried with "Intel_iommu=sp_off" boot option. Traffic runs without any error for more than 1 hrs. What magic this option did? :) Cheers, Ashok