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SubjectRe: 2x Oracle slowdown from 2.2.16 to 2.4.4

On Friday, July 13, 2001 01:31:42 AM +0400 Hans Reiser <> wrote:

> Lance, I would appreciate it if you would be more careful to identify that you are using O_SYNC,
> which is a special case we are not optimized for, and which I am frankly skeptical should be used at
> all by an application instead of using fsync judiciously. It is rare that an application is
> inherently completely incapable of ever having two I/Os not be serialized, and using O_SYNC to force
> every IO to be serialized rather than picking and choosing when to use fsync, well, I have my doubts
> frankly. If a user really needs every operation to be synchronous, they should buy a system with an
> SSD for the journal from (they sell them tuned to run ReiserFS), or else they are
> just going to go real slow, no matter what the FS does.

There is no reason for reiserfs to be 5 times slower than ext2 at anything ;-)
Regardless of if O_SYNC is a good idea or not. I should have optimized the
original code for this case, as oracle is reason enough to do it.


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