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SubjectRE: 2.3.x wish list?
Date
You *really* don't want to run an ext2fs, ufs, xfs, etc filesystem at more
than 95% capacity, unless you're writing to it once and then mounting it
readonly. Otherwise, it will be slow. Very slow. Think Windows 95 on
barbituates.

Anyway, this isn't a kernel issue.

-----Original Message-----
From: Riley Williams [mailto:rhw@MemAlpha.CX]
Sent: Friday, May 28, 1999 2:58 AM
To: Marcel J.E. Mol
Cc: tytso@mit.edu; R.E.Wolff@BitWizard.nl; mbeattie@sable.ox.ac.uk;
linux-kernel@vger.rutgers.edu
Subject: Re: 2.3.x wish list?


Hi Marcel.

> It is not that I question the use of reserved space. I just want
> to have finer control over it. In the end it is just a tuning
> parameter. The default can still be 5%. Allowing fraction
> percentages might also do the job...

To be honest, with modern hard drive sizes, the unit needs to be
changed from % to %^2 or 1/10'000ths of capacity, at least. One way
would be for mk*fs to allow two decimal places on the %'s, and that
has the advantage of remaining compatible with the existing format,
whilst another would be to allocate a new option along the lines of
the following:

-u Specify the number of millionth's of reserved blocks for the
superuser. This value defaults to 50,000, or 5% of the total.

I chose -u because it is not only currently not listed on mke2fs's
manpage, but u is also the latinised version of the scientific symbol
for millionth, its name being micro.

Best wishes from Riley.

+----------------------------------------------------------------------+
| There is something frustrating about the quality and speed of Linux |
| development, ie., the quality is too high and the speed is too high, |
| in other words, I can implement this XXXX feature, but I bet someone |
| else has already done so and is just about to release their patch. |
+----------------------------------------------------------------------+
* ftp://ftp.MemAlpha.cx/pub/rhw/Linux
* http://www.MemAlpha.cx/kernel.versions.html


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