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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
> 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 :-)


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