Linus Torvalds wrote:
On Sun, 9 Dec 2007, Robert Hancock wrote:
The obvious suspect with a filesystem problem would be the disk
controller driver, AHCI here. However, the controller appears to set the
flag to indicate that it supports 64-bit DMA, so it should be fine,
unless it lies of course (which we know that ATI SB600 chipset does, but
I don't believe Intel is known to).
Could still be a DMA mapping bug that only shows up when IOMMU is used.
However, AHCI is a pretty well tested driver..
AHCI is a pretty well tested driver, but 99%+ of all testers still tend to
have less than 4GB of memory. So I do *not* believe that the highmem bits
are all that well tested at all.
Can somebody who knows the driver send Marco a test-patch to just limit
DMA to the low 32 bits, and then Marco can at least verify that yes, that
that it. While it looks like DMA problems, there could obviously be some
other subtle issue with big-memory machines (ie the PCI allocations etc
tend to change too!)
..
We have another outstanding bug report of a Marvell chipset being
used in a funky 32-bit PPC situation with memory above the 4GB mark.
Possibly related, possibly not.
The Marvell SATA driver is still VERY EXPERIMENTAL right now,
missing some errata and stuff. This should improve over the next few months.
Cheers
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