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Comment Re:It's not for bare NAND (Score 1) 140

by bogolisk (#41565225) Attached to: Samsung Creates New File System F2Fs For Linux & Android

If this is the case, then I don't see the point. Filesystems already in use support TRIM.

Just because you send TRIM down it doesn't mean that the device can erase the block. The erase block size in NAND is usually 256KB or larger. Using 256KB as IO block is just crazy, drivers use something like 16KB or 32KB. The filesystem has to be aware of the erase block size so it can send down TRIM command for an aligned and contiguous 256KB block, then the device can go on and erase it.

Comment Re:SSD Drives (Score 3, Insightful) 140

by bogolisk (#41565169) Attached to: Samsung Creates New File System F2Fs For Linux & Android

SSDs are NAND, but they are not bare NAND. They have control circuitry which manages the problems with NAND (e.g. bad blocks), and presents the drive as a contiguous block of good storage.

These filesystems are all for bare NAND, not SSDs, which include NAND, but are not bare NAND.

How can this be "Informative", it's plain wrong. f2fs works on top of block devices.

Comment It's not for bare NAND (Score 5, Informative) 140

by bogolisk (#41562325) Attached to: Samsung Creates New File System F2Fs For Linux & Android

No. SSDs present themselves to the OS as contiguous block devices. Filesystems intended for bare NAND flash like jffs(2), yaffs, and this new F2Fs would be totally useless for SSDs. They're intended for bare NAND, which SSDs are not.

You're wrong

f2fs work on top of block devices. f2fs sends TRIM (ATA command) down to the device. Bare NAND flash doesn't grok ATA commands.

Comment Re:Questions about this device (Score 1) 274

by bogolisk (#38001752) Attached to: Asus Unveils Quad-Core Transformer Prime Tablet

1. It has the best (claimed) battery life (when used with the dock) 18h. Kal-El, with 40Mbps video capacity, should (in theory) handle any kind of HD video including BR rips. NEON+quadcore should be good for games (NEON wasn't supported in Tegra-2).

2. The 4+1 is transparent to the OS, according to Nvidia.

3. Linux kernel will scale and spread tasks among avail cores. whether a game will spread intensive jobs to multi-threads? well it depends on the game...

4. Do you play games all the time? well get a console then.
NASA

Low Quality Alloy Cause of Shuttle Main Tank Issue 118

Posted by Soulskill from the heisenberg-compensators-were-acting-up dept.
BJ_Covert_Action writes "NASA engineers have finally discovered the root cause of the cracks that have been found on space shuttle Discovery's main external tank. The main tank, one of the 'Super Lightweight Tank' models developed by Lockheed-Martin, employs an aluminum-lithium alloy developed by Lockheed-Martin specifically for this application. The new alloy is used in various structural stringers throughout the SLWT design. Unfortunately, the batch of this alloy used in the tank that is currently mated with the Discovery shuttle appears to be of low quality. The alloy used in the stringers has a 'mottled' appearance, compared to the nominal appearance typically used in the main tank stringers (see picture in article). This appearance is indicative of a fracture threshold that is significantly lower than typical. NASA has determined, through testing, that this low grade alloy has only 65% of the fracture strength of the nominal alloy typically used. NASA engineers have devised a potential fix to the problem that they are currently testing to ensure the repair will cause no unintended consequences. NASA plans to have the Discovery shuttle ready to launch again by February 24th, 2011."
Image

Corporations Hiring Hooky Hunters 610

Posted by samzenpus from the taking-a-personal-detective-day dept.
No longer satisfied with your crinkled doctor's note, a growing number of corporations are hiring "Hooky Detectives." Private investigator Rick Raymond says he's staked out bowling alleys, pro football games, weddings and even funerals looking for people using sick days. From the article: "Such techniques have become permissible at a time when workers are more likely to play hooky. Kronos, a workforce productivity firm in Chelmsford, Mass., recently found that 57 percent of salaried employees take sick days when they're not sick — almost a 20 percent increase from statistics gathered between 2006 and 2008."

Nvidia Adds GeForce GTX 570 To Graphics Lineup 52

Posted by CmdrTaco from the pixels-and-polys dept.
crookedvulture writes "Filling the gap between mid-range graphics cards around the $200 mark and high-end excess that costs upward of $500, Nvidia has added a $350 GeForce GTX 570 to its stable of graphics cards. Based on the company's latest GF110 GPU, the GTX 570 offers equivalent performance to last year's flagship GTX 480 with lower power consumption and a cheaper price tag. The value proposition is strong with this one, although as The Tech Report's review points out, it would be wise to hold out until AMD's "Cayman" graphics card breaks cover, which it's expected to do next week."
Hardware

PC Era Forecasted To End In 18 Months 449

Posted by CmdrTaco from the i-have-crystal-balls dept.
dcblogs writes "In a historic shift, shipments of smartphones, tablets and other app-enabled devices will overtake PC shipments in the next 18 months, an event that may signify the end of the PC-centric era, market research firm IDC said. IDC said worldwide shipments this year of app-enabled devices, which include smartphones and media tablets such as the iPad, will reach 284 million. In 2011, makers will ship 377 million of these devices, and in 2012, the number will reach 462 million shipments, exceeding PC shipments. In 2012, there will be 448 million PC shipments. One shipment equals one device. PC sales will continue to climb, but will no longer rule."
KDE

Does the End of KOffice Mean the End of KDE? 233

Posted by CmdrTaco from the yeah-that'll-happen dept.
jfruhlinger writes "Venerable Linux office suite KOffice has been reborn as "Calligra," a name meant to evoke calligraphy but perhaps a bit too close to the neme of a deranged Roman emperor. Perhaps more importantly, Calligra seems to be cooperating with the future MeeGo mobile Linux distro. Could this be the beginning of the end of the KDE desktop, at least under its current branding?"
Space

Rogue Satellite Shuts Down US Weather Services 202

Posted by CmdrTaco from the ambush-backstab-vanish dept.
radioweather writes "On Sunday, the drifting rogue 'zombie' Galaxy 15 satellite with a stuck transmitter interfered with the satellite data distribution system used by NOAA's National Weather Service (NWS), effectively shutting down data sharing between NWS offices nationwide, as well as weather support groups for the US Air force. This left many forecasters without data, imagery, and maps. Interference from Galaxy 15 affected transmissions of the SES-1 Satellite, which not only serves NOAA with data relay services, but also is used to feed TV programming into virtually every cable network in the US. NOAA's Network Control Facility reports that the computer system affected was NOAA's Advanced Weather Interactive Processing System (AWIPS) used to issue forecasts and weather bulletins which uses the weather data feed. They also state the problem is likely to recur again this month before the satellite drifts out of range and eventually dies due to battery depletion."

Comment it's simply ignorance! (Score 2, Interesting) 90

by bogolisk (#34392294) Attached to: Linus On Branching Practices

The kernel devs don't do development on master! However, git's fast-forward-merge will, by default, push development/intermediate commits onto master. Those intermediate commits are extremely useful for code-inspection/code-review and bisect-based debugging. They're are not meant for starting a new dev branch and that why they're not tagged! There's nothing new or interesting in that article other than a bunch stupid comments at the bottom. The whole thing smells like a disguised advertising for PlasticSCM

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