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Particular topics that need work
BsdOSSpecificBsd OS Specific
Should be updated, preferably by someone with actual experience with such systems. In particular, the TCP socket buffer tuning hints from MacOSXOSSpecific probably work as-is on *BSD. Someone should check that, and either copy/paste the Mac instructions over to the BSD topic, or unify them somehow else.
LinuxOSSpecificLinux OS Specific
The TCP_CONGESTION setsockopt() socket option should be documented. It is available in Linux and possibly also in FreeBSD. It allows to select the TCP congestion-control algorithm on a per-connection basis. The current Linux-specific tuning instructions only talk about setting this globally.
WindowsOSSpecificWindows OS Specific
Maybe this should be split into pre- and post-Vista topics, because the TCP stack in Vista (and Windows 7, and Windows Server 2008 etc.) is different enough from that in Windows XP and earlier. A few specific topics that should be talked about:
- Receive-side scaling: This is Microsoft's name for a feature that allows an interrupt handler to dispatch incoming packets to multiple (logical) processors. Similar to what Solaris does with "multi-tasking" adapters such as the Neptune, but without the need for hardware support. The feature makes sure that packets for the same flow are handled on the same processor. See http://blogs.msdn.com/wndp/archive/2006/05/05/Winhec-blog-tcpip-2.aspx
- Document how auto-scaling is configured, and why some people turn it off (because it can cause TCP Window Scaling to be activated, which exposes brokenness in EvilMiddleBoxes), and how Vista SP2 changes this. See http://www.kombitz.com/2007/02/14/vista-auto-tuning/, http://www.talktalkmembers.com/forums/showthread.php?p=248939, http://social.technet.microsoft.com/Forums/en-US/itprovistasp/thread/570652e5-438d-46a7-8302-00f84c430eea
NetworkBufferSizingNetwork Buffer Sizing
This topic should be updated regularly as the scientific discussion advances. ACM SIGCOMM CCR 39/2 (April 2009) has a new article, Perspectives on Router Buffer Sizing: Recent Results and Open Problems, by Arun Vishwanath, Vijay Sivaraman, and Marina Thottan, which contains an excellent survey of the area.
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On various mailing lists, or while surfing the Web, or when reading scientific publications, we often encounter work that is related to the information in the PERT Knowledge Base. Maybe it would be suitable for integration into an existing topic, or deserve a new topic. In other cases it would make a nice "further reading" topic at some point. If you encounter such pieces of information, consider leaving them in the following list as a reminder to yourself and others that this might be worth adding (somehow) to the PERT Knowledge Base.
– Main.SimonLeinen — 21 Jul 2009 - 02 Jul 2011 Simon Leinen — 2009-07-29 — 2021-09-05