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SubjectRe: New filesystem for Linux
On Fri, Nov 03, 2006 at 02:31:46PM +0100, Mikulas Patocka wrote:
> >>>I am fully aware the counters are effectively 48-bit. If they were
> >>>just 32-bit, you would likely have hit the problem yourself already.
> >>
> >>Given the seek time 0.01s, 31-bit value would last for minimum time of 248
> >>days when doing only syncs and nothing else. 47-bit value will last for
> >>reasonably long.
> >
> >So you can at most do one transaction per drive seek? That would
> >definitely solve the overflow case, but hardly sounds like a
> >high-performance filesystem. :)
> Really it can batch any number of modifications into one transaction
> (unless fsync or sync is called). Transaction is closed only on
> fsync/sync, if 2 minutes pass (can be adjusted) or when the disk runs out
> of space.


> Mikulas



"Is there not promise of rain?" Ling Tan asked suddenly out
of the darkness. There had been need of rain for many days.
"Only a promise," Lao Er said.
Pearl S. Buck - Dragon Seed

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