Dan Halbert wrote:
A couple of months ago I reported some problems with a batch of Tyan K8SSA (S3870) based machines.
...
The symptom is that some large (700MB to >1GB) files opened for read and
then closed show corruption in the pagecache. One or more 4k blocks in a
file will be completely trashed...
A reboot or a flush of the pagecache fixes the problem,
so it's only in the pagecache, not on disk.
One more followup on this, for posterity. (I don't like unanswered questions in mailing-list archives.) It turns out this problem seems to be the same one reported in this kernel bug: http://bugzilla.kernel.org/show_bug.cgi?id=7768. It has also been discussed on LKML.
The bug was reported on AMD Nvidia boards; we have AMD ServerWorks, but the problem aooears to be the same. AMD is working on this. The current workaround is to boot with "iommu=soft".
Dan
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