|
||||
|
Ikea “Laver” chair. $10. Metal frame, “PP-CO” (polypropylene/polyethylene copolymer?) seat and back. Spots near the two front corners are high-stress and fail (crack) easily. Chair frame without seat. Front corners are high-stress points that crack. This one has already been welded back together (welded from the back, so the weld isn’t very . . . → Read More: Ikea “Laver” Chair repair A parser is used to translate wikitext to HTML for viewing. Since there are a bunch of parser projects for MediaWiki’s markup, I’ll go benchmark some of them to see how fast they run. . . . → Read More: Mediawiki Parsers Ever since upgrading from Mandriva 2010.0(?) to 2010.1 (and also 2010.2), both of my Samsung laser printers have been intermittent. Print jobs would often be silently discarded. CUPS logs show that the print jobs are completed, the printer would warm up, the printer’s LED blinks once or twice, then the print job is “complete”. But nothing gets printed. . . . → Read More: Samsung Linux CUPS USB Printing MLPPP on Bell’s DSL GAS network doesn’t work very well because the GAS network appears to reorder PPP frames (which is forbidden by RFC 1661). Ideally, Bell should stop reordering packets. The next best option is for the ISP and user to configure MRU and MRRU settings to reduce packet/frame fragmentation. With multilink PPPoE, the client should use an IP-MTU of 1486 bytes (1484 on Linux 2.6.31+ due to a bug), a MRU of 1492, and an MRRU of 1486. The ISP should use an MRU of 1492, MRRU of 1486 (possibly 1484 to work around the Linux bug, until the bug gets fixed), and apply the IP-MTU correctly (MRU-0 = 1492 for PPP, MRU-6 = 1486 for MLPPP). . . . → Read More: Teksavvy MLPPP Performance Intel uses Hyper-Threading (HT) as a feature for market segmentation: The desktop Core i5 processors differ from the Core i7 mainly by whether HT has been disabled, and Intel charges a significant price premium for the Core i7. Does the performance improvement of HT justify its cost? I test the performance of HT using a selection of cluster-type workloads. . . . → Read More: Hyper-Threading Performance Process scheduling for multicore multithreaded (SMT or HT) systems adds a new challenge to an operating system’s process scheduler. Two threads scheduled on different cores will run faster than two threads scheduled onto different thread contexts of the same core because much of the hardware resources are shared between SMT thread contexts. This can be . . . → Read More: Linux SMT-Aware Process Scheduling The Sparkle Power SPI270LE Flex ATX power supply has a rather noisy 40 mm fan that that is temperature-controlled to reduce noise when cool. The fan control circuit failed and powered the fan at full speed regardless of temperature. . . . → Read More: PSU Fan Control It has been claimed that new refrigerators use much less power than old ones. This is also the premise of The Great Refrigerator Roundup program that encourages replacement of refrigerators older than 15 years. Here is one comparison, measured over about 3 days. . . . → Read More: Refrigerators It is well-known that a car’s fuel efficiency decreases during the winter months. There are many potential contributors, including increased air density causing drag, excessively rich fuel mixture from cold starts taking a long time to warm up, increased pumping losses from dense cold air intake, increased engine oil viscosity, increased rolling friction from colder . . . → Read More: Seasonal Fuel Efficiency Here are some FPGA CAD benchmarks across a few relatively-modern machines. The original motivation was to figure out why VPR ran much slower on a Core 2 Xeon 5160 system than a desktop-class Core 2 Quad Q9550. A secondary goal is to measure the Core i7-980X @ 4215 MHz. I added in some Pentium 4 . . . → Read More: Core2, Nehalem, FPGA CAD |
||||
|
Copyright © 2012 Blog - All Rights Reserved |
||||
