Messages in this thread | | | Subject | Re: [RFC] generic device DMA implementation | From | Miles Bader <> | Date | 05 Dec 2002 12:17:55 +0900 |
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David Gibson <david@gibson.dropbear.id.au> writes: > It seems the "try to get consistent memory, but otherwise give me > inconsistent" is only useful on machines which: > (1) Are not fully consisent, BUT > (2) Can get consistent memory without disabling the cache, BUT > (3) Not very much of it, so you might run out. > > The point is, there has to be an advantage to using consistent memory > if it is available AND the possibility of it not being available. ... > Are there actually any machines with the properties described above?
As I mentioned in my previous message, one of my platforms is like that -- PCI consistent memory must be allocated from a special pool of memory, which is only 2 megabytes in size.
-Miles -- `Life is a boundless sea of bitterness' - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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