Messages in this thread | | | Date | Mon, 30 Apr 2007 23:18:28 +0100 | From | Matt Keenan <> | Subject | Re: CONFIG_HIGHMEM4G and 1GB RAM |
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William Lee Irwin III wrote: > On Sat, 28 Apr 2007 21:26:42 +0100 "Bradley Chapman" <kakadu@gmail.com> wrote: > >>> Basically, all I want to know is whether or not enabling >>> CONFIG_HIGHMEM4G for a laptop that has exactly 1GB of RAM will result >>> in any performance degradation. >>> > > On Mon, Apr 30, 2007 at 12:17:55AM -0700, Andrew Morton wrote: > >> I would expect the advantages of the additional 128MB to considerably >> outweigh the cost of turning on CONFIG_HIGHMEM4G. >> That cost will be a little extra CPU consumption inside the kernel, but the >> great majority of CPU consumption usually happens in userspace anyway. >> > > The CONFIG_VMSPLIT config options were merged for such cases. > > It should be able to split on any 4MB-aligned boundary in > CONFIG_HIGHMEM4G. CONFIG_VMSPLIT_3G_OPT appears to do something of > this sort to use an entire 1GB RAM with minimal user address space > reduction. > > This is an ELF ABI violation but the number of major applications > that break is apparently low. > > wine and some java implementations being two of the big caveats.
Matt
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