Re: [Xen-devel] "swiotlb buffer is full" problem with tg3 and kernel 3.16.0-4-686-pae on Xen 4.4.1

[Ian Campbell <ian.campbell@xxxxxxxxxx>]

On Thu, 2015-05-21 at 17:17 +0200, Marco Steinacher wrote:
> Shall I try to build a 3.16.0-4-686-pae kernel with
> "CONFIG_NEED_DMA_MAP_STATE=y"?

Yes, this is what I would recommend. Although it's not as simple as
turning it on, you actually need to patch the Kconfig as in this mail:
http://www.spinics.net/lists/netdev/msg325844.html such that it comes on
by itself.

> Shall I try to set the 'iommu' and/or 'swiotlb' kernel parameters? To
> what values?

I don't think so, those were used in that thread to demonstrate that the
issue exited even on native -- i.e. not under Xen

If you could file your results into the Debian BTW[0], i.e. by running
"reportbug <linux-image-pkg-name>" then that would be useful to help get
it fixed in a future update.

Ian.

[0] http://bugs.debian.org 


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