Messages in this thread | | | Date | Tue, 30 Mar 2004 17:21:48 -0500 | From | Jeff Garzik <> | Subject | Re: [PATCH] barrier patch set |
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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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