From: "Xie, Huawei" <huawei.xie@intel.com> To: Shivapriya Hiremath <shivpri.b@gmail.com>, "dev@dpdk.org" <dev@dpdk.org> Subject: Re: [dpdk-dev] Why do we need iommu=pt? Date: Mon, 20 Oct 2014 22:39:46 +0000 Message-ID: <C37D651A908B024F974696C65296B57B0F2CD832@SHSMSX101.ccr.corp.intel.com> (raw) In-Reply-To: <CAKU5Fo_7fQHcYa-1ZBX8=D0SCkxZL8VLEpWYtJ6rG4DpV=g3gw@mail.gmail.com> > -----Original Message----- > From: dev [mailto:dev-bounces@dpdk.org] On Behalf Of Shivapriya Hiremath > Sent: Monday, October 20, 2014 2:59 PM > To: dev@dpdk.org > Subject: [dpdk-dev] Why do we need iommu=pt? > > Hi, > > My question is that if the Poll mode driver used the DMA kernel interface > to set up its mappings appropriately, would it still require that iommu=pt > be set? > What is the purpose of setting iommu=pt ? PMD allocates memory though hugetlb file system, and fills the physical address into the descriptor. pt is used to pass through iotlb translation. Refer to the below link. http://lkml.iu.edu/hypermail/linux/kernel/0906.2/02129.html > > Thank you.
next prev parent reply other threads:[~2014-10-20 22:36 UTC|newest] Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top 2014-10-20 21:58 Shivapriya Hiremath 2014-10-20 22:39 ` Xie, Huawei [this message] 2014-10-21 7:32 ` Alex Markuze 2014-10-21 16:53 ` Shivapriya Hiremath 2014-10-21 19:10 ` Zhou, Danny 2014-10-22 7:35 ` alex 2014-10-22 8:53 ` Liang, Cunming 2014-10-22 15:21 ` Zhou, Danny 2014-10-23 7:49 ` Alex Markuze 2014-10-27 17:27 ` Shivapriya Hiremath 2014-10-27 17:32 ` Zhou, Danny 2014-10-30 23:22 ` Zhou, Danny 2014-10-31 0:05 ` Shivapriya Hiremath
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