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SubjectRe: PATCH: Raw device IO for 2.1.131
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[1]
> > There is also the fact that raw io for databases IS faster. Whatever type
> > filesystem you design, doesn't matter since we know which blocks to write

[2]
> Well from Linus' comments it sounds like raw devices won't be appearing in
> 2.3, or indeed, ever.

mingo@chiara.csoma.elte.hu said:
> well, my interpretation is that [2] was said only because [1] is
> false. So the rest of your conclusions are false too.

Has anybody actually *measured* this? Do we know that the cache does not get
polluted by doubly-cached data (once by DBMS once by linux)? Someone needs
to write a benchmark that simulates the access patterns (including memory
use) of a DBMS in order to prove a point, one way or the other.

And what about the case the Oracle guy pointed out where they share a SCSI
disk between two hosts? Can that be made to work under Linux?
--
Steve Williams "The woods are lovely, dark and deep.
steve@icarus.com But I have promises to keep,
steve@picturel.com and lines to code before I sleep,
http://www.picturel.com And lines to code before I sleep."



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