On Sun, Oct 19, 2008 at 05:07:02AM -0400, Christoph Hellwig wrote:

> > This is probably the vmap cache aliasing problem that we paid a bit of
> > attention to a few months ago, no?
>
> Shouldn't the cachepolicy switch take care of that?

Setting cachepolicy=uncached should make aliasing issues disappear.
If you're still seeing issues with cachepolicy=uncached, it's likely
some other issue.