Re: [PATCH] barrier patch set

From: Bartlomiej Zolnierkiewicz
Date: Tue Mar 30 2004 - 17:34:11 EST

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.


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