118 lines
4.8 KiB
Text
118 lines
4.8 KiB
Text
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" [
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<!ENTITY date "$FreeBSD: www/en/features.sgml,v 1.21 2004/10/19 21:32:05 brueffer Exp $">
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<!ENTITY title "About FreeBSD's Technological Advances">
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<!ENTITY % includes SYSTEM "includes.sgml"> %includes;
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]>
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<html>
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&header;
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<h1>FreeBSD offers many advanced features.</h1>
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<blockquote>
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<p>No matter what the application, you want your system's resources
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performing at their full potential. FreeBSD's advanced features
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enable you to do just that.</p>
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</blockquote>
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<hr align="left" noshade="noshade" width="100%"><font
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color="#FF0000"><font size="+1">A complete operating system based on
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4.4BSD.</font></font>
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<blockquote>
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<p>FreeBSD's distinguished roots derive from the latest <b>BSD</b>
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software releases from the Computer Systems Research Group at the
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University of California, Berkeley. The book <i>The Design and
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Implementation of 4.4BSD Operating System</i>, written by the 4.4BSD
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system architects, thus describes much of FreeBSD's core functionality
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in detail.</p>
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<p>Drawing on the skills and experience of a diverse and world-wide
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group of volunteer developers, the FreeBSD Project has worked to
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extend the feature set of the 4.4BSD operating system in many ways,
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striving constantly to make each new release of the OS more stable,
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faster and containing new functionality driven by user requests.</p>
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</blockquote>
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<hr align="left" noshade="noshade" width="100%"><font
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color="#FF0000"><font size="+1">FreeBSD provides higher performance,
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greater compatibility with other operating systems and less system
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administration.</font></font>
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<blockquote>
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<p>FreeBSD's developers attacked some of the more difficult problems in
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operating systems design to give you these advanced features:</p>
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<ul>
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<li><b>A merged virtual memory and filesystem buffer cache</b>
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continuously tunes the amount of memory used for programs and the
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disk cache. As a result, programs receive both excellent memory
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management and high performance disk access, and the system
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administrator is freed from the task of tuning cache sizes.</li>
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<li><b>Compatibility modules</b> enable programs for other operating
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systems to run on FreeBSD, including programs for Linux, SCO UNIX,
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and System V Release 4.</li>
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<li><b>Kernel Queues</b> allow programs to respond more efficiently
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to a variety of asynchronous events including file and socket IO,
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improving application and system performance.</li>
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<li><b>Accept Filters</b> allow connection-intensive applications,
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such as web servers, to cleanly push part of their functionality into
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the operating system kernel, improving performance.</li>
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<li><b>Soft Updates</b> allows improved filesystem
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performance without sacrificing safety and reliability.
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It analyzes meta-data filesystem operations to avoid having
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to perform all of those operations synchronously.
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Instead, it maintains internal state about pending meta-data
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operations and uses this information to cache meta-data,
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rewrite meta-data operations to combine subsequent
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operations on the same files, and reorder meta-data
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operations so that they may be processed more efficiently.</li>
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<li><b>Support for IPsec and IPv6</b> allows improved security in
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networks, and support for the next-generation Internet Protocol,
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IPv6.</li>
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</ul>
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<p>Work in-progress includes support for fine-grained SMP locking in
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kernel, allowing higher performance on multi-processor machines,
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support for Scheduler Activations, allowing parallelism in threaded
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programs, filesystem snapshots, fsck-free booting, network
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optimizations such as zero-copy sockets and event-driven socket IO, ACPI support, and advanced security features such as Mandatory
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Access Control.</p>
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</blockquote>
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<hr align="left" noshade="noshade" width="100%"><font
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color="#FF0000"><font size="+1">FreeBSD provides many security features
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to protect networks and servers.</font></font>
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<blockquote>
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<p>The FreeBSD developers are as concerned about security as they are
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about performance and stability. FreeBSD includes kernel support for
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stateful IP firewalling, as well as other services, such as IP proxy
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gateways.</p>
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<p>FreeBSD also includes support for encryption software, secure
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shells, Kerberos authentication, "virtual servers" created using
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jails, chroot-ing services to restrict application access to the
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file system, Secure RPC facilities, and access lists for services
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that support TCP wrappers.</p>
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</blockquote>
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&footer;
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</body>
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</html>
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