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    SubjectRe: Linux 2.6.29
    Jeff Garzik wrote:
    > Jens Axboe wrote:
    >> Another problem is that FLUSH_CACHE sucks. Really. And not just on
    >> ext3/ordered, generally. Write a 50 byte file, fsync, flush cache and
    >> wit for the world to finish. Pretty hard to teach people to use a nicer
    >> fdatasync(), when the majority of the cost now becomes flushing the
    >> cache of that 1TB drive you happen to have 8 partitions on. Good luck
    >> with that.
    >
    > (responding to an email way back near the start of the thread)
    >
    > I emailed Microsoft about their proposal to add a WRITE BARRIER
    > command to ATA, documented at
    > http://www.t13.org/Documents/UploadedDocuments/docs2007/e07174r0-Write_Barrier_Command_Proposal.doc
    >
    >
    > The MSFT engineer said they were definitely still pursuing this proposal.
    >
    > IMO we could look at this too, or perhaps come up with an alternate
    > proposal like FLUSH CACHE RANGE(s).
    >
    > Jeff
    >

    I agree that it is worth getting better mechanisms in place - the cache
    flush is really primitive. Now we just need a victim to sit in on
    T13/T10 standards meetings :-)

    ric



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