April 29, 2009 posted by Soren Jacobsen
On behalf of the NetBSD developers, I am proud to announce that
NetBSD 5.0, the thirteenth release of the NetBSD operating system,
is now available.
NetBSD 5.0 features greatly improved performance and scalability on
modern multiprocessor (SMP) and multi-core systems. Multi-threaded
applications can now efficiently make use of more than one CPU or core,
and system performance is much better under I/O and network load.
This improved performance is the result of a rewritten threading
subsystem based on a 1:1 threading model, new kernel synchronization
primitives, kernel preemption, a rewritten scheduler implementation,
real-time scheduling extensions, processor sets, and dynamic CPU sets
for thread affinity. Almost all core kernel subsystems, like virtual
memory, memory allocators, file system frameworks for major file
systems, and others were audited and overhauled to make use of highly
In addition to scalability and performance improvements, a significant
number of major features have been added. Some highlights are: a preview
of metadata journaling for FFS file systems (known as WAPBL, Write
Ahead Physical Block Logging), the 'jemalloc' memory allocator, the
X.Org X11 distribution instead of XFree86 on a number of ports, the
Power Management Framework, ACPI suspend/resume support on many
laptops, write support for UDF file systems, the Automated Testing
Framework, the Runnable Userspace Meta Program framework, Xen 3.3
support for both i386 and amd64, POSIX message queues and
asynchronous I/O, and many new hardware device drivers.
For full details, please see the 5.0 release notes.
Complete source and binaries for NetBSD 5.0 are available for download
at many sites around the world. A list of download sites providing FTP,
AnonCVS, and other services may be found at http://www.NetBSD.org/mirrors/