Re: Linux 2.6.29

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Ric Wheeler wrote:
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).

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 :-)


Heck, we could even do a prototype implementation with the help of Mark Lord's sata_mv target mode support...

	Jeff



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