On Tue, Jun 29, 2004 at 11:25:03PM -0700, William Ballard said > Greg Madden in <[🔎] 200406261122.05053.gomadtroll@gci.net>, suggested > enabling CONFIG_HIGHMEM4G=y for machines with > 960MB memory; however > the help for this option in 2.6.7 says "if you will never run a machine > with more than 1 Gigabyte of memory." > > It seems to suggest that for the interval [0,1024] it should be not set > and (1024,4096] it should be set; i.e. not set at exactly 1GB. Is this > correct? I'm pretty sure the limit is at 896MB of RAM. Without HIGHMEM, the kernel will ignore all memory above that. With it, the kernel will use up to $bignum GB of RAM, but (some? all? I forget) memory access will be slower. The conventional wisdom seems to be that if you have less than 1GB of RAM, then this slowdown negates the benefit of the extra =< 128 MB of RAM you would have access to. Or so I've heard; my biggest machine has 512MB of RAM. It's probably one of those things where you need to test it yourself to decide whether it's worth it for you or not. -- Words of the day: CDMA Firewalls quarter AK-47 bullion unclassified War Crimes
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