Messages in this thread | | | From | Systemkennung Linux <> | Subject | Re: About ioremap() and L2-Cache | Date | Wed, 23 Jul 1997 04:32:36 +0200 (MET DST) |
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> about the PWT bit. if it's needed, __ioremap(flags) can be called with any > caching flag. (which will be written into the page table entry). Is there > any RL use for the PWT bit?
It might be interesting for clearing pages etc. to avoid unecessary dirtying the caches where the probability of the data being used again is relativly small. A bit a different cache trick speeds up the performance of clear_page() on MIPS by a factor of two.
Ralf
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