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Re: [Xen-devel] Status of "dma, x86, xen: reduce SWIOTLB usage in Xen guests" series

On 01/25/2016 02:47 AM, David Vrabel wrote:
> On 23/01/16 22:12, Sarah Newman wrote:
>> Greetings,
>> We are having problems related to mptsas and "swiotlb buffer is full" with 
>> the Xen4CentOS kernel (3.18). It looks like the last related work was
>> the series 
>> http://lists.xenproject.org/archives/html/xen-devel/2014-12/msg00770.html 
>> back at the end of 2014 and I'm wondering if there are any plans
>> to revive the series.

> As a workaround, you can give dom0 more than 4 GiB and then the driver
> will set a 64-bit DMA mask.  I don't think the memory needs to populated
> so something like dom0_mem=2GiB,max:4GiB might work.

4GiB RAM worked, though we may need to shuffle things around to put this into 
effect everywhere. Thanks.

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