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Re: [Xen-devel] Re: pv_ops dom0 USB fixed

Gerd Hoffmann wrote:
Jeremy Fitzhardinge wrote:
Intel 64bit box, 6GB RAM (dom0_mem=2g), running rawhide.
OK, that's interesting.  The symptom is the same (drive stops talking),
but after a while rather than immediate.


That suggests there might be
some issue with what memory gets allocated or something?

Or translated.  Maybe it grooks due to being fed with an invalid bus
address where it can't DMA do.

Can you try changing include/linux/libata.h:

-#undef ATA_DEBUG               /* debugging output */
+#define ATA_DEBUG              /* debugging output */

and see what happens as it nears failure? The difference for me is ATA (fails) vs ATAPI (works) for the DVD drive - but they follow essentially the same code path. But if you're getting some disk IO, then there has to be more to it than that.

Also, does swiotlb=0 make any difference?


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