Linux LAN card: Find out full duplex / half speed or mode.
ethtool command
Uss ethtool to display or change ethernet card settings. To display duplex speed, enter:
# ethtool eth1
Having problems with an NIC that keeps reporting fe:ff:ff:ff:ff:ff as its MAC address.
Iptables is used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel. Several different tables may be defined. Each table contains a number of built-in chains and may also contain user defined chains.
By default, Iptables log message to a /var/log/messages file. However you can change this location. I will show you how to create a new logfile called /var/log/iptables.log. Changing or using a new file allows you to create better statistics and/or allows you to analyze the attacks
Speex is an Open Source/Free Software patent-free audio compression format designed for speech. The Speex Project aims to lower the barrier of entry for voice applications by providing a free alternative to expensive proprietary speech codecs. Moreover, Speex is well-adapted to Internet applications and provides useful features that are not present in most other codecs. Finally, Speex is part of the GNU Project and is available under the revised BSD license.
via Speex: a free codec for free speech.
Used for Siri.
Phidgets are a set of “plug and play” building blocks for low cost USB sensing and control from your PC.
An awkward silence ensued. The blue suits did not even confer among themselves. They just sat there, stonelike. Finally, the chief suit responded. “OK,” he said, “maybe you don’t infringe these seven patents. But we have 10,000 U.S. patents. Do you really want us to go back to Armonk [IBM headquarters in New York] and find seven patents you do infringe? Or do you want to make this easy and just pay us $20 million?”
After a modest bit of negotiation, Sun cut IBM a check, and the blue suits went to the next company on their hit list.
via Patently Absurd – Forbes.com.
Incredible. Article from 2002.
Symmetric multiprocessing – Wikipedia, the free encyclopedia.
In computing, symmetric multiprocessing (SMP) involves a multiprocessor computer hardware architecture where two or more identical processors are connected to a single shared main memory and are controlled by a single OS instance. Most common multiprocessor systems today use an SMP architecture. In the case of multi-core processors, the SMP architecture applies to the cores, treating them as separate processors. Processors may be interconnected using buses, crossbar switches or on-chip mesh networks. The bottleneck in the scalability of SMP using buses or crossbar switches is the bandwidth and power consumption of the interconnect among the various processors, the memory, and the disk arrays. Mesh architectures avoid these bottlenecks, and provide nearly linear scalability to much higher processor counts at the sacrifice of programmability:
By December 16 of this year, IBM says it plans to support Windows Server 2008 R2 Datacenter Edition running in a zBX chassis on its HX5 blades.
via Windows on Mainframes Due December 16 — Enterprise Systems.
The idea of replacing hard disk drives with flash memory has been gaining steam in the IT industry. But a research group at Stanford University is going even further: they say the goal should be to replace hard disks with DRAM.
via Can DRAM replace hard drives and SSDs? RAMCloud creators say yes.
This seems to violate the KISS principle. The comments in the above article are also interesting. RAM disks have been around since early DOS days.
Fencing is a very important concept in computer clusters for HA (High Availability). Unfortunately, given that fencing does not offer a visible service to users, it is often neglected.
Fencing may be defined as a method to bring an HA cluster to a known state. But, what is a “cluster state” after all? To answer that question we have to see what is in the cluster.
via Fencing and Stonith.
STONITH (Shoot The Other Node In The Head)
Stonith is our fencing implementation. It provides the node level fencing.
Gotta love how they come up with those acronyms. 🙂