Messages in this thread | | | From | "Stefan Monnier" <monnier+lists/linux/kernel/news/@tequila.cs.yale.edu> | Subject | Re: Speeding up fsck 2 times | Date | 18 Jun 1999 10:25:56 -0400 |
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>>>>> "Pavel" == Pavel Machek <pavel@bug.ucw.cz> writes: > I'm slowing down data operation by 5% or so. (Don't know how to > benchmark this).
This 5% is worthless: it could be 0.1% as it could be 50%. Without a fair benchmark, you don't know.
> I'm speeding up metadata operation by 100% or so.
Only for some metadata operations.
> People _want_ to slow normal operation down in exchange for faster > fsck. (Did you hear that cries for journalling?) Journalling certainly > _will_ slow common operations down but makes fsck faster.
But people who scream for journalling don't just want a faster fsck, they want an "instantaneous" fsck (at least: mostly independent from the size of the disk). I'm not willing to lose 5% performance in order to win just a factor 2 for fsck (especially since my SCSI disk doesn't seem to suffer from the slow unlink that seems to plague some IDE setups). But if the slowdown is actually closer to 1%, I might be convinced. That's why benchmarks are important.
Stefan
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