Do a roll on the FreeBSD feature list, basicallly unchanged in 10+ months
for reasons beyond comprehension. Specifically document the following features now present in mainstream releases: - Multithreaded SMP architecture and support for preemption. - M:N threading out of the box. - File system snapshots and background fsck. - Netgraph pluggable network stack framework. - TrustedBSD MAC Framework. - GEOM. This page could use more work in other ways also...
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Robert Watson
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<!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 $">
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<!ENTITY date "$FreeBSD: www/en/features.sgml,v 1.22 2004/11/17 21:54:32 rushani 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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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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@ -74,17 +66,58 @@
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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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IPv6. The FreeBSD IPSEC implementation includes support for a
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broad range of accelerated crypto hardware.</li>
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<li><b>Multi-threaded SMP architecture</b> capable of executing the
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kernel in parallel on multiple processors, and with <b>kernel
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preemption</b>, allowing high priority kernel tasks to preempt
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other kernel activity, reducing latency. This includes a
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<b>multi-threaded network stack</b> and a <b>multi-threaded
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virtual memory subsystem</b>.</li>
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<li><b>M:N threading application threading</b> permitting threads to
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execute on multiple CPUs in a scaleable manner, mapping many user
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threads onto a small number of <b>Kernel Schedulable Entities</b>.
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By adopting the <b>Scheduler Activation</b> model, the threading
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model can be adapted to the specific requirements of a broad range
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of applications.</li>
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<li><b>File system snapshots</b>, permitting administrators to take
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atomic file system snapshots for backup purposes using the free
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space in the file system, as well as facilitating <b>background
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fsck</b>, which allows the system to reach multiuser mode without
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waiting on file system cleanup operations following power outages.
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</li>
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<li><b>Netgraph pluggable network stack</b> allows developers to
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dynamically and easily extend the network stack through clean
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layered network abstractions. Netgraph nodes can implement a broad
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range of new network services, including encapsulation, tunneling,
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encryption, and performance adaptation.</li>
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<li><b>TrustedBSD MAC Framework extensible kernel security</b>,
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which allows developers to customize the operating system security
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model for specific environments, from creating hardening policies
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to deploying mandatory labeled confidentiality of integrity
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policies.</li>
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<li><b>GEOM pluggable storage layer</b>, which permits new storage
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services to be quickly developed and cleanly integrated into the
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FreeBSD storage subsystem. GEOM provides a consistent and
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coherrent model for discovering and layering storage services,
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making it possible to layer services such as RAID and volume
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management easily.</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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</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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