Messages in this thread | | | Date | Wed, 11 Feb 2004 20:13:10 +0100 | From | Mark de Vries <> | Subject | Re: About highmem in 2.6 |
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Dave McCracken wrote: > --On Wednesday, February 11, 2004 18:47:04 +0100 Luis Miguel García > <ktech@wanadoo.es> wrote: > > >>When I first installed 2.4, someone told me that if I had 1 gb ram it was >>better to not use highmem because those extra aditional mb was not worth >>the speed penalty of using the feature. >> >>Sorry for my ignorance (and my sucking english) but must I enable highmem >>now with 2.6? or have it any speed penalty althought? > > > I don't know if anyone has actually measured the relative performance, but > I'd expect the answer to be the same as 2.4. There is a small but > measurable performance penalty for enabling highmem which is higher than > the benefit of the extra 128 meg of memory you get when you have 1G. If > you have more than 1G it's better to enable highmem. >
I've been using this patch for a while now on my box (with 1GB): http://www.kernel.org/pub/linux/kernel/people/andrea/kernels/v2.4/2.4.23aa1/00_3.5G-address-space-5 (kernel is 'vanilla' otherwise)
This allows you to use your full 1GB w/out highmem support.... (2G/2G user/kernel addr space split, or something..)
Anything (potentially) wrong/bad about this patch??
Is there a simmilar patch for 2.6??
Rgds, Mark.
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