This README file is obsolete. The cited problems were fixed long ago

and the code is installed by default so no longer requires action by
the administrator to be included.

1 files changed, 0 insertions, 58 deletions

diff --git a/sys/ufs/ffs/README.softupdates b/sys/ufs/ffs/README.softupdates
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-$FreeBSD$
-
-Using Soft Updates
-
-To enable the soft updates feature in your kernel, add option
-SOFTUPDATES to your kernel configuration.
-
-Once you are running a kernel with soft update support, you need to enable
-it for whichever filesystems you wish to run with the soft update policy.
-This is done with the -n option to tunefs(8) on the UNMOUNTED filesystems,
-e.g. from single-user mode you'd do something like:
-
-	tunefs -n enable /usr
-
-To permanently enable soft updates on the /usr filesystem (or at least
-until a corresponding ``tunefs -n disable'' is done).
-
-
-Soft Updates Copyright Restrictions
-
-As of June 2000 the restrictive copyright has been removed and 
-replaced with a `Berkeley-style' copyright. The files implementing
-soft updates now reside in the sys/ufs/ffs directory and are
-compiled into the generic kernel by default.
-
-
-Soft Updates Status
-
-The soft updates code has been running in production on many
-systems for the past two years generally quite successfully.
-The two current sets of shortcomings are:
-
-1) On filesystems that are chronically full, the two minute lag
-   from the time a file is deleted until its free space shows up
-   will result in premature filesystem full failures. This
-   failure mode is most evident in small filesystems such as
-   the root. For this reason, use of soft updates is not
-   recommended on the root filesystem.
-
-2) If your system routines runs parallel processes each of which
-   remove many files, the kernel memory rate limiting code may
-   not be able to slow removal operations to a level sustainable
-   by the disk subsystem. The result is that the kernel runs out
-   of memory and hangs.
-
-Both of these problems are being addressed, but have not yet
-been resolved. There are no other known problems at this time.
-
-
-How Soft Updates Work
-
-For more general information on soft updates, please see:
-	http://www.mckusick.com/softdep/
-	http://www.ece.cmu.edu/~ganger/papers/CSE-TR-254-95/
-
---
-Marshall Kirk McKusick <mckusick@mckusick.com>
-July 2000