[Hardy(Xen)]: SRU request for LP#247148

[Tim Gardner]

Stefan Bader wrote:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/247148
> 
> SRU justification:
> 
> Impact: Using SWIOMMU unnecessarily causes "out of space" errors and
> subsequently causes corruptions in software RAID (and probably also
> caused the problems mentioned in
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/238118/comments/9).
> 
> Fix: (taken from the Xen changelog) This patch adds a new check,
> check_pages_physically_contiguous(), to the test for pages stradding
> page boundaries both in swiotlb_map_sg() and dma_map_sg(), to capture
> these ranges and map them directly via virt_to_bus() mapping rather than
> through the swiotlb.
> 
> Testcase: IO errors when doing increased workload on SCSI drives (see
> bug report)
> 

ACK - the test results look good.

rtg
-- 
Tim Gardner tim.gardner at canonical.com