From mboxrd@z Thu Jan  1 00:00:00 1970
From: Sarah Newman <srn@prgmr.com>
Subject: Re: Status of "dma, x86,
 xen: reduce SWIOTLB usage in Xen guests" series
Date: Wed, 27 Jan 2016 14:20:04 -0800
Message-ID: <56A94294.2020601@prgmr.com>
References: <56A3FAD2.3020506@prgmr.com> <56A5FD36.5030903@citrix.com>
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To: David Vrabel <david.vrabel@citrix.com>, "xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
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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.