Re: [PATCH] barrier patch set

[Jeff Garzik]

Stephen C. Tweedie wrote:
> Yep.  It scares me to think what performance characteristics we'll start
> seeing once that gets used everywhere it's needed, though.  If every raw
> or O_DIRECT write needs a flush after it, databases are going to become
> very sensitive to flush performance.  I guess disabling the flushing and
> using disks which tell the truth about data hitting the platter is the
> sane answer there.


For IDE, O_DIRECT and O_SYNC can use special "FUA" commands, which don't 
return until the data is on the platter.

	Jeff



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