Re: [PATCH] barrier patch set

From: Jeff Garzik
Date: Tue Mar 30 2004 - 17:23:23 EST

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.


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