Re[4]: reiser4.1

[Pysiak Satriani <pysiak.satriani@wp.pl>]

Hello Valdis,

Friday, March 4, 2005, 8:55:52 AM, you wrote:

> IBM's AIX 4.3 and later support LZ compression on their JFS file system.
> I was able to measure a 10-15% speed-up by converting /usr to compressed
> even on a 133MZ Power604e chip because even back then, it was faster to
> read half as many blocks off a SCSI disk and decompress.
Interesting.

> So it's been at least a potential win for a decade or so, assuming your
> filesystem is able to deal well with fragments (you can't really win unless
> you take a 4K or so logical block, compress it to some number of 512-byte
> chunks, and then store the resulting chunks cheaply - JFS does the
> blocks-and-frags efficiently, so it's easy to win.
I wonder if NTFS compression does it well... I was always scared of
compression on NTFS because of possible slowdowns and just the fact that
compression adds another level of complexity to all reads/write and
possible future recovery if something breaks down.

-- 
Best regards,
Maciej