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Re: [Xen-devel] Massive problems with 'PCI-DMA: Out of SW-IOMMU space fo

from [Christopher S. Aker] [Permanent Link][Original]
To: Markus Schuster <ma.schuster@xxxxxx>
Subject: Re: [Xen-devel] Massive problems with 'PCI-DMA: Out of SW-IOMMU space for XXX bytes [..]' with 3Ware controller
From: "Christopher S. Aker" <caker@xxxxxxxxxxxx>
Date: Mon, 26 Nov 2007 11:12:05 -0500
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Markus Schuster wrote:

PCI-DMA: Out of SW-IOMMU space for 40960 bytes at device 0000:03:00.0
3w-9xxx: scsi0: ERROR: (0x06:0x001C): Failed to map scatter gather list.
(03:00.0 is the 3Ware Controller)


Here's my "me too" data point.
I'm also seeing this on Xen 3.1.2, 64bit Xen, PAE Dom0 (2.6.18). For me, it only happens if Dom0 is low on memory and into swap quite a bit. Compiling a kernel with -j4 or so, with only 256M allocated to Dom0 will trigger it. I tried a number of swiotlb settings, none eliminate the problem. 

-Chris


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