Re: [Xen-devel] dma_alloc_coherent issue with tg3 in x86_64 build

[Keir Fraser <Keir.Fraser@xxxxxxxxxxxx>]

On 28 Jul 2005, at 22:25, Ian Pratt wrote:

> > I'm surprised that the mfns are already fragmented that early in boot.
> > Or maybe this case is just an example of bad luck?
> debug builds go out of their way to fragment things -- its proved 
> useful
> for catching drivers that are taking liberties. Maybe not too smart 
> when
> used in conjunction with dom0 grabbing all of memory...
>
> It would be good to confirm that things are OK with non debug builds,
> but I still don't think it's a good idea to rely on this. Let's hold a
> couple of MB back from dom0 to avoid problems.
It only reverses the page order in domain0 -- so debug build should 
have no worse behaviour (Xen ought to merge the reversed pages together 
when domain0 frees the previously-mapped pages).
 -- Keir


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