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    SubjectRe: [PATCH resend 5/9] MIPS: sync after cacheflush
    On Mon, Oct 18, 2010 at 12:41:20PM -0700, Kevin Cernekee wrote:

    > On Mon, Oct 18, 2010 at 12:19 PM, Ralf Baechle <ralf@linux-mips.org> wrote:
    > > I'm trying to get a statement from the MIPS architecture guys if the
    > > necessity to do anything beyond a cache flush is an architecture violation.
    >
    > IMO such a requirement would be unnecessarily strict. Larger flushes
    > (e.g. page at a time) tend to benefit from some form of pipelining or
    > write gathering. Forcing the processor to flush exactly 32 bytes at a
    > time, synchronously, could really slow things down and thrash the
    > memory controller.
    >
    > I have not been able to find any official statement from MIPS that
    > says that CACHE + SYNC should be used, but that seems like the most
    > intuitive way to implement things on the hardware side.

    I agree with you but I seem to remember having read something that suggests
    otherwise. Oh well, maybe it's just something in the Cambridge water
    that makes my halocinate ;)

    Ralf


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