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FreeBSD 4.0 Release Notes
RELEASE NOTES
FreeBSD Release 4.0-RELEASE
Any installation failures or crashes should be reported by using the
send-pr command (those preferring a Web-based interface can also see
http://www.FreeBSD.org/send-pr.html).
For information about FreeBSD and the layout of the 4.0-RELEASE
directory (especially if you're installing from floppies!), see
ABOUT.TXT. For installation instructions, see the INSTALL.TXT and
HARDWARE.TXT files.
For the latest of these 4.0-STABLE snapshots, you should always see:
ftp://current.FreeBSD.org/pub/FreeBSD
If you wish to get the latest post-3.X-RELEASE technology.
Table of contents:
------------------
1. What's new since the 3.1/4.0 branch
1.1 KERNEL CHANGES
1.2 SECURITY FIXES
1.3 USERLAND CHANGES
2. Supported Configurations
2.1 Disk Controllers
2.2 Ethernet cards
2.3 ATM
2.4 Misc
3. Obtaining FreeBSD
3.1 FTP/Mail
3.2 CDROM
4. Upgrading from previous releases of FreeBSD
5. Reporting problems, making suggestions, submitting code
6. Acknowledgements
1. What's new since the 3.1/4.0 branch
--------------------------------------
All changes described here are unique to the 4.0 branch unless
specifically marked as [MERGED] features.
1.1. KERNEL CHANGES
-------------------
NFS has been immensely improved with bug fixes and performance tuning.
Support for more than 32 signals has been added.
POSIX 1003.1 conformant SA_SIGINFO signal handlers are now supported.
SIGFPE signal handlers (both SA_SIGINFO and traditional BSD handlers)
now get meaningful error codes describing the kind of error. See
sigaction(2).
IA32 hardware debug registers are now supported. See ptrace(2) and
procfs(5).
Jail(8) aware sysctl(8) variables have been added for Linux mode.
A large number of bug fixes and performance improvements have been
made to the VM system, including and most especially to mmap() and
related functions. The MAP_NOSYNC option has been added to better support
the use of shared files as an IPC mechanism. The VM system's swapper has
been completely rewritten and performance has been greatly enhanced,
especially when swapping over NFS.