WriteThrough pageclearing, 2.1.50, anyone with a PPro?

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could someone with a PPro give this patch a try? Maybe it shows up in some of the lmbench numbers [lat_proc?]. It does pageclearing with WT caching logic, which prevents PPro write-allocate L1 cache tactics, less L1 cache trashing, hopefully. I have only P5 systems to test here. [the patch works, but shows no effect obviously]

you'll need 2.1.50 for this.