From: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
To: Dante Cinco <dantecinco@gmail.com>
Cc: Xen-devel <xen-devel@lists.xensource.com>
Subject: Re: swiotlb=force in Konrad's xen-pcifront-0.8.2 pvops domU kernel with PCI passthrough
Date: Fri, 12 Nov 2010 11:58:40 -0500 [thread overview]
Message-ID: <20101112165840.GB10339@dumpdata.com> (raw)
In-Reply-To: <AANLkTimBkaOpz43JaWZuBd2N663aSNp6-LSGx5UMaoV+@mail.gmail.com>
On Thu, Nov 11, 2010 at 05:02:55PM -0800, Dante Cinco wrote:
> Here's another datapoint: with iommu=1,passthrough,no-intremap,verbose
> in the Xen command line and iommu=soft in the pvops domU command line
> also results in an NMI (see below). Replacing iommu=soft with
Ok, so that enabled the VT-D and enables you to do 64-bit DMA.
> swiotlb=force in pvops domU works reliably but with the I/O
> performance degradation. It seems that regardless of whether iommu is
> enabled or disabled in the hypervisor, swiotlb=force is necessary in
> the pvops domU.
That is bizzare. I am pretty sure it should work just fine with 'iommu=soft'.
My test scripts confirm this, but let me run once more just to make sure.
prev parent reply other threads:[~2010-11-12 16:58 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-11-11 1:16 swiotlb=force in Konrad's xen-pcifront-0.8.2 pvops domU kernel with PCI passthrough Dante Cinco
2010-11-11 16:04 ` Konrad Rzeszutek Wilk
2010-11-11 18:31 ` Dante Cinco
2010-11-11 19:03 ` Konrad Rzeszutek Wilk
2010-11-11 19:42 ` Lin, Ray
2010-11-12 15:56 ` Konrad Rzeszutek Wilk
2010-11-12 16:20 ` Lin, Ray
2010-11-12 16:55 ` Konrad Rzeszutek Wilk
2010-11-12 19:38 ` Lin, Ray
2010-11-12 22:33 ` Konrad Rzeszutek Wilk
2010-11-12 22:57 ` Lin, Ray
2010-11-16 17:07 ` Dante Cinco
2010-11-16 18:57 ` Konrad Rzeszutek Wilk
2010-11-16 19:43 ` Dante Cinco
2010-11-16 20:15 ` Konrad Rzeszutek Wilk
2010-11-18 1:09 ` Dante Cinco
2010-11-18 17:19 ` Konrad Rzeszutek Wilk
2010-11-18 17:28 ` Chris Mason
2010-11-18 17:54 ` Mathieu Desnoyers
2010-11-18 18:43 ` Dante Cinco
2010-11-18 18:52 ` Lin, Ray
2010-11-18 19:35 ` Dante Cinco
2010-11-18 21:20 ` Dan Magenheimer
2010-11-18 21:39 ` Lin, Ray
2010-11-19 0:20 ` Dan Magenheimer
2010-11-19 1:38 ` Dante Cinco
2010-11-19 17:10 ` Jeremy Fitzhardinge
2010-11-19 17:52 ` Dante Cinco
2010-11-19 17:58 ` Keir Fraser
2010-11-19 22:36 ` Dan Magenheimer
2010-11-20 0:13 ` Dante Cinco
2010-11-19 17:55 ` Lin, Ray
2010-11-12 18:29 ` Dante Cinco
2010-11-11 22:32 ` Dante Cinco
2010-11-12 1:02 ` Dante Cinco
2010-11-12 16:58 ` Konrad Rzeszutek Wilk [this message]
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