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Domain: unipi.it
Stories and comments across the archive that link to unipi.it.
Stories · 7
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Pushing the Limits of Network Traffic With Open Source (cloudflare.com)
An anonymous reader writes: CloudFlare's content delivery network relies on their ability to shuffle data around. As they've scaled up, they've run into some interesting technical limits on how fast they can manage this. Last month they explained how the unmodified Linux kernel can only handle about 1 million packets per second, when easily-available NICs can manage 10 times that. So, they did what you're supposed to do when you encounter a problem with open source software: they developed a patch for the Netmap project to increase throughput. "Usually, when a network card goes into the Netmap mode, all the RX queues get disconnected from the kernel and are available to the Netmap applications. We don't want that. We want to keep most of the RX queues back in the kernel mode, and enable Netmap mode only on selected RX queues. We call this functionality: 'single RX queue mode.'" With their changes, Netmap was able to receive about 5.8 million packets per second. Their patch is currently awaiting review. -
Hayabusa Probe Arrives at Destination
david.given writes "The Japanese space probe Hayabusa has just arrived at its destination, the asteroid Itokawa, and is taking pictures. The largely autonomous ion-drive powered vehicle was launched in 2003 and was supposed to have arrived last year, but a solar flare damaged the solar panels causing a reduction in power. It will study the asteroid for two months before collecting a sample from the surface and departing for Earth, which it should reach in 2007. It's a pity that NASA's asteroid rover, which Hayabusa was going to drop off, got cancelled due to budgetry constraints..." -
2004 MN4, Even Higher Probability
phreakuencies writes "Worried since the recent post about the MN4 2004 asteroid, I added a bookmark to its 'impact risk' section at NASA. The asteroid started as having a 1/233 probability of hitting earth. Later it raised to 1/63. Daily computations made on 25 Dec raised its chances up to 1/45. Optimists can now say it has a 97.8% probability of missing earth." And Veteran writes " NeoDys offers the 'Orbfit' software package (source code released under the GPL) which can be used to get a pre-release view of the situation with Asteroid 2004MN4." -
Feature Preview of Gnome 2.8
Leonardo writes "The GNOME foundation should release the new version of this desktop environment on the 15th of September. While we waiting for version 2.8, Foot Notes has a link that explains what's new in this release. Improvements include both core parts (like VFS and Nautilus) and UI modules, like a new applet manager, an improved gconf editor and a new theme. In addition there are some proposed modules like new system tools and a new VNC server. Take a look at Davyd Madeley' site (mirror) if you want to view some sweet screenshots." -
Earth Acquires a Quasi-Moon
richard_za writes "Earth has acquired a so called quasi-moon, an asteroid: 2003 YN1, which will encircle us for the next couple of years while it orbits the sun on a horse-shoe shaped path. Full story on News24. It was found by team led by Paul Chodas, an asteroid specialist at Nasa's Jet Propulsion Laboratory in California. An orbit simulation can be seen in this Java applet." -
New Scheduler Available for FreeBSD
flynn_nrg writes "Luigi Rizzo, one of the FreeBSD developers, has just finished the code for a new scheduler. From the announcement: '...as promised, a first version of the Proportional Share scheduler that we developed is available here. These are for a recent -STABLE (i think any version from 4.4 should work; the only 3 files modified are kern_synch.c, kern_switch.c and proc.h, plus a one-line change to kern_exit.c). I have tested it a little bit on a diskless system, and it seems to survive running a full X session with the usual set of xterm, netscape etc. while i do a "renice" of the processes and even switch back and forth between schedulers. But do not trust this yet for a production system!' Read the full post here." -
Killer Asteroid
Scott Manley writes "Astronomers have found a mile wide asteroid which has a non-zero possibility of hitting the earth i n the next century. Asteroid 1999 AN10 was found on 13th January '99 by the LINEAR system and scientists working in Italy have predicted a close approach in August 2027 and a potential collision in August 2039. This has been kept quiet after the panic last year over 1997 XF11 whic had a similar 'remote' possibility, if 1999 AN10 were to hit it would be a real civilisation killer. " I can't believe scientists are bothing with this stuff when we all know Y2k will kill us all in less than a year anyway.