Messages in this thread | | | Date | Mon, 03 Mar 2003 09:42:06 -0800 | From | "Martin J. Bligh" <> | Subject | Re: Dmesg: Use a PAE enabled kernel |
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> BIOS-provided physical RAM map: > BIOS-e820: 0000000000000000 - 00000000000a0000 (usable) > BIOS-e820: 00000000000f0000 - 0000000000100000 (reserved) > BIOS-e820: 0000000000100000 - 00000000bfffa000 (usable) > BIOS-e820: 00000000bfffa000 - 00000000bffff000 (ACPI data) > BIOS-e820: 00000000bffff000 - 00000000c0000000 (ACPI NVS) > BIOS-e820: 00000000fec00000 - 00000000fec01000 (reserved) > BIOS-e820: 00000000fee00000 - 00000000fee01000 (reserved) > BIOS-e820: 00000000ffff0000 - 0000000100000000 (reserved) > BIOS-e820: 0000000100000000 - 0000000140000000 (usable) > Warning only 4GB will be used. > Use a PAE enabled kernel. > 3200MB HIGHMEM available. > 896MB LOWMEM available. > > So you are saying that not all the 4Gb of ram will get mapped/used (specifically, everything not marked 'usable') ? > > Can you quantify the performance degredation of a PAE enabled kernel?
Depends on your workload ... there's only one way to be sure, benchmark it. If you're doing heavy page replacment / setup / teardown, it'll be more expensive. As Alan has pointed out, you're loosing a quarter of your RAM ;-)
M.
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