On Sat, Aug 14, 1999 at 04:57:45AM +0900, Hidetoshi Shimokawa wrote:
> ...
>
> As for 21164 Alpha, it has 96KB 3-way L2 cache.
> So it needs only 4 (= 96KB / 8KB / 3) colors.
>
> My Alpha box has 4MB direct-map L3 cache and
> it needs 4MB / 8KB = 512 colors. I have the following entries in my
> vm_page.h
>
I am afraid that the current implementation of page coloring doesn't
scale very well to such a large number of colors, especially if you
don't have an extremely large amount of physical memory. Far too often,
it's unable to allocate a page of the appropriate color. Even with
just 8 colors on a machine with 320MB of physical memory, the number
of times that coloring fails during a "make world" is extraordinary.
Bruce Evans and I are looking into this...if someone with an Alpha
has time to help out that could be useful.
Alan
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