[Xen-users] "swiotlb buffer is full" workaround (Was Re: SAS drivers that work reliably under Xen)

[Andy Smith <andy@xxxxxxxxxxxxxx>]

Hi Sarah,

On Tue, Jan 17, 2017 at 12:15:10PM +0000, Andy Smith wrote:
> On Mon, Jan 16, 2017 at 10:18:58AM -0800, Sarah Newman wrote:
> > How much ram are you giving the dom0?
> 
> 2G at the moment.
> 
> > I'm not entirely certain if this is the same error we were seeing
> > over a year ago, but if it is one mitigation is to give the dom0
> > at least 4GiB ram, see
> > https://lists.xenproject.org/archives/html/xen-devel/2016-01/msg03033.html
> 
> Good idea, I'll give that a go and let you know.

Thanks a lot for this pointer. I'm surprised it didn't come up when
I searched for "swiotlb buffer is full" before.

Anyway, I set "dom0_mem=2GiB,max:4GiB" and have been hammering it
for a few hours now and haven't had any problems. I can normally
trigger the issue within a couple of seconds, so this is promising.

Cheers,
Andy

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