I was also skeptical about DirectMap results added up being less than MemTotal. I see now, Thanks for the explanation.
Jamie Gloudon On Mon, Oct 01, 2012 at 08:23:38AM -0700, Hugh Dickins wrote: > On Mon, 1 Oct 2012, Jamie Gloudon wrote: > > > > Interesting. I am able to reproduce the same problem as you using > > mem=700M, which shows: > > > > DirectMap4k: 4096 kB > > DirectMap2M: 18446744073709547520 kB > > > > However, it appears to be normal without the boot parameter: > > > > DirectMap4k: 4096 kB > > DirectMap2M: 15708160 kB > > It appears to be normal because the calculations haven't wrapped around, > but if you compare with 3.4 or before, I think you'll find that it > still adds up to too little. > > > > > What does your output looks like with the full amount on 3.6? > > On 3.6: > > MemTotal: 8060528 kB > ... > DirectMap4k: 2048 kB > DirectMap2M: 7229440 kB > > So it's showing significantly less direct mapped than is included > in MemTotal (which itself omits some areas of reserved memory). > > Whereas on 3.4: > > MemTotal: 8060760 kB > ... > DirectMap4k: 4096 kB > DirectMap2M: 8275968 kB > > Hugh -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
