Messages in this thread | | | Date | Wed, 28 Mar 2001 10:54:42 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: Not MTRR !? was: ISSUE: very slow (factor 100) 4-way 16GByte server, with 2.4.2 |
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On Wed, 28 Mar 2001, Robert Suetterlin wrote:
> As far as I can see almost all memory is set write-back. The memory at > the far end belongs to some hardware, see /proc/iomem below.
> reg00: base=0xfb000000 (4016MB), size= 16MB: uncachable, count=1 > reg01: base=0xfc000000 (4032MB), size= 64MB: uncachable, count=1 > reg02: base=0x00000000 ( 0MB), size=8192MB: write-back, count=1 > reg03: base=0x200000000 (8192MB), size=4096MB: write-back, count=1 > reg04: base=0x300000000 (12288MB), size=2048MB: write-back, count=1 > reg05: base=0x380000000 (14336MB), size=1024MB: write-back, count=1 > reg06: base=0x3c0000000 (15360MB), size= 512MB: write-back, count=1 > reg07: base=0x3e0000000 (15872MB), size= 256MB: write-back, count=1 ------ + 15.75 GB
It looks like the last 256MB isn't cached (well, it doesn't have an MTRR at all) and Linux starts loading programs from the top of memory ...
regards,
Rik -- Virtual memory is like a game you can't win; However, without VM there's truly nothing to lose...
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