Andrew Cooke | Contents | Latest | RSS | Twitter | Previous | Next

C[omp]ute

Welcome to my blog, which was once a mailing list of the same name and is still generated by mail. Please reply via the "comment" links.

Always interested in offers/projects/new ideas. Eclectic experience in fields like: numerical computing; Python web; Java enterprise; functional languages; GPGPU; SQL databases; etc. Based in Santiago, Chile; telecommute worldwide. CV; email.

Personal Projects

Lepl parser for Python.

Colorless Green.

Photography around Santiago.

SVG experiment.

Professional Portfolio

Calibration of seismometers.

Data access via web services.

Cache rewrite.

Extending OpenSSH.

C-ORM: docs, API.

Last 100 entries

[Bike] Lessons From 2 Leading 2 Trailing; [Link] Veg Restaurants in Santiago; [Link] List of Contemporary Latin American Authors; [Bike] FTHR; [Link] Whoa - NSA Reduces Collection (of US Residents); [Link] Red Bull's Breitbart; [Link] Linux Threads; [Link] Punycode; [Link] Bull / Girl Statues on Wall Street; [Link] Beautiful Chair Video; Update: Lower Pressures; [Link] Neat Python Exceptions; [Link] Fix for Windows 10 to Avoid Ads; [Link] Attacks on ZRTP; [Link] UK Jazz Invasion; [Review] Cuba; [Link] Aricle on Gender Reversal of US Presidential Debate; {OpenSuse] Fix for Network Offline in Updater Applet; [Link] Parkinson's Related to Gut Flora; Farellones Bike Park; [Meta] Tags; Update: Second Ride; Schwalbe Thunder Burt 2.1 v Continental X-King 2.4; Mountain Biking in Santiago; Books on Ethics; Security Fail from Command Driven Interface; Everything Old is New Again; Interesting Take on Trump's Lies; Chutney v6; References on Entropy; Amusing "Alexa.." broadcast; The Shame of Chile's Education System; Playing mp4 gifs in Firefox on Opensuses Leap 42.2; Concurrency at Microsoft; Globalisation: Uk -> Chile; OpenSuse 42.2 and Synaptics Touch-Pads; Even; Cherry Jam; Lebanese Writer Amin Maalouf; C++ - it's the language of the future; Learning From Trump; Chinese Writer Hu Fayun; And; Apricot Jam; Also; Excellent Article on USA Politics; Oh Metafilter; Prejudice Against The Rurals; Also, Zizek; Trump; Why Trump Won; Doxygen + Latex on CentOS 6; SMASH - Solve 5 Biggest Problems in Physics; Good article on racism, brexit, and social divides; Grandaddy are back!; Consciousness From Max Entropy; Democrats; Harvard Will Fix Black Poverty; Modelling Bicycle Wheels; Amusing Polling Outlier; If Labour keeps telling working class people...; Populism and Choice; Books on Defeat; Enrique Ferrari - Argentine Author; Transcript of German Scientists on Learning of Hiroshima; Calvert Journal; Owen Jones on Twitter; Possible Japanese Authors; Complex American Literature; Chutney v5; Weird Componentized Virus; Interesting Argentinian Author - Antonio Di Benedetto; Useful Thread on MetaPhysics; RAND on fighting online anarchy (2001); NSA Hacked; Very Good LRB Article on Brexit; Nussbaum on Anger; Tasting; Apple + Kiwi Jam; Hit Me; Sudoku - CSP + Chaos; Recycling Electronics In Santiago; Vector Displays in OpenGL; And Anti-Aliased; OpenGL - Render via Intermediate Texture; And Garmin Connect; Using Garmin Forerunner 230 With Linux; (Beating Dead Horse) StackOverflow; Current State of Justice in China; Axiom of Determinacy; Ewww; Fee Chaos Book; Course on Differential Geometry; Okay, but...; Sparse Matrices, Deep Learning; Sounds Bad; Applebaum Rape; Tomato Chutney v4; Have to add...; Culturally Liberal and Nothing More; Weird Finite / Infinite Result

© 2006-2017 Andrew Cooke (site) / post authors (content).

Starting a Linux Computer Remotely (WOL / PME)

From: andrew cooke <andrew@...>

Date: Tue, 22 Sep 2009 19:49:40 -0400

I have a small, low powered computer (VIA C7 chip) that runs as a
firewall.  My work machine only runs when I'm working (this makes the
office quieter and cuts our electric bill by 25%).  But sometimes it's
nice to use my work machine even when I'm elsewhere.  Until now, I had
to leave it running, but I just worked out how to start it via the
network.

The technology is called Wake On Lan (WOL), and it was fairly easy to
get working.

First, I had to enable it on my motherboard.  This is an Asus P5Q and
the option to enable is under "Power", then "APM Configuration" - it's
the line "Power on By PCI Devices" and the help text mentions PME,
which is another name for WOL.

That's all that's needed on the motherboard (this will, when working,
start from "power off" - you don't need to use suspend), but the
option must also be enabled from within Linux.  This needs to be set
on each boot and is then saved when next powered down.

Interactively, the configuration can be done with "ethtool" using the
"wol g" argument, but it makes more sense to automate this.

Because this is a desktop machine I use the "traditional" ifup
scripts, rather than network manager.  These scripts are configured in
/network/ifcfg-ethX.cfg (where X is typically 0 or 1) - change the
ETHTOOL_OPTIONS so it is equal to 'wol g'.  That automates the calling
of ethtool.

It's also worth nothing the mac address (from "ifconfig") at this
point, because that is needed to wake the computer.

Once the configuration is done, and computer powered off, all that is
needed is to run the "wol" command from another computer on the same
network, using the MAC address.  In my case I use the low-powered
server and the command is:
  wol -h 10.255.255.255 00:01:02:03:04:05
(but with the correct MAC address at the end).  The "-h
10.255.255.255" makes sure that the message is sent to the right
network (because that computer is a firewall it has two network cards)
- most people won't need that.

(For some reason the computer needs to "sit" for a moment (less than a
minute) after power off before this works, so be patient).

The driver for the network card is etl1, but that's pretty much
irrelevant (it needs to work with ethtool correctly).

For more info see:
http://woelfisch.livejournal.com/94245.html
http://ubuntuforums.org/showthread.php?t=234588

Andrew

Enable PCIE Too

From: andrew cooke <andrew@...>

Date: Sun, 17 Jan 2010 13:36:47 -0300

For my ASUS board I need to enable both "Power on by PCI Devices" and
also "Power on by PCIE Devices".  I have no idea why, but without both
of these, WOL does not work.

Andrew

Comment on this post