On 01/17/2013 01:04 PM, paul.szabo@xxxxxxxxxxxxx wrote: >>> On my large machine, 'free' fails to show about 2GB memory ... >> You probably have a memory hole. ... >> The e820 map (during early boot in dmesg) or /proc/iomem will let you >> locate your memory holes. > > Now that my machine is running an amd64 kernel, 'free' shows total Mem > 65854128 (up from 64447796 with PAE kernel), and I do not see much > change in /proc/iomem output (below). Is that as should be? Yeah, that all looks sane. Your increased memory is because your 64GB machine had some of its memory mapped _above_ the 64GB physical memory limit that PAE has. /proc/iomem is generally just a dump of what the hardware *is*, so it shouldn't change between kernels. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>