[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

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

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

Xen-devel mailing list



Lists.xenproject.org is hosted with RackSpace, monitoring our
servers 24x7x365 and backed by RackSpace's Fanatical Support®.