caching of page frames

[Frank Coldwell]

Hi,

This is what I have read in book about Linux kernel:

"Linux clears the PCD and PWT flags of all Page Directory and Page
Table entries; as a result, caching is enabled for all page frames,
and the write-back strategy is always adopted for writing".

Are there situations where better performance can be achieved by
disabling caching of page frames, because overhead is just setting one
flag, and maybe there are situations when we can be sure
that caching of page frame is not needed ?

Kind regards,

-- 
marc coldwell

software engineer
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