Messages in this thread | | | Date | Mon, 05 Nov 2007 09:22:52 -0800 | From | "H. Peter Anvin" <> | Subject | Re: x86_64 ten times slower than i386 |
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Bo Brantén wrote: > >> On Sat, 3 Nov 2007, Matt Mackall wrote: >> >>> This is typically due to a problem with the setup of your MTRRs. Try > > This is the output from cat /proc/mtrr > > reg00: base=0x00000000 ( 0MB), size=2048MB: write-back, count=1 > reg01: base=0x80000000 (2048MB), size=1024MB: write-back, count=1 > reg02: base=0xc0000000 (3072MB), size= 256MB: write-back, count=1 > reg03: base=0xcf800000 (3320MB), size= 8MB: uncachable, count=1 > reg04: base=0xcf700000 (3319MB), size= 1MB: uncachable, count=1
Confusing! Your maximum would be 3072+256M = 3328M, except that because of the uncachable MTRRs (presumably stolen memory for video), the maximum is 3319M.
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