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DateTue, 30 Mar 2004 17:38:40 -0500
FromJeff Garzik <>
SubjectRe: [PATCH] barrier patch set
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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