Re: [PATCH] barrier patch set

[Jeff Garzik]

Bartlomiej Zolnierkiewicz wrote:
> On Wednesday 31 of March 2004 00:21, Jeff Garzik wrote:
>
> > 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.
>
>
> Do you know of any drive supporting it?  I don't.


Newer SATAs do...

	Jeff



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