Speedy OLPC Suspend/Resume

   
   
   
   
   

HP iPAQ

How fast can you fall asleep and then wake up again? If you are human, this is a good hour, but if you are a computer, how long do you think it should take?

Whatever you just guessed, I am sure it's longer than 10 milliseconds, the speed of a iPAQ handheld running Linux. Why does this matter? As Jim Gettys explains:

The OLPC machine bears some good resemblance to the iPAQ: flash for main storage, integrated graphics, and the like. On our hardware, Mitch [Bradley] measured 25 milliseconds, using LinuxBIOS as the BIOS on the machine.

If Linux on the Geode can be made to resume as fast as an iPAQ (and it is a considerably faster processor), we should be able to suspend to RAM and resume so fast that you won’t be able to observe it under most circumstances, as we might get to the 30-35 millisecond range, which is at the limits of human perception.

By powering down and back up the 2B1 Children's Machine laptop, OLPC hopes to keep its power consumption below the 2 Watt mark, an impressively efficient goal. At 2 Watts, a string power generator might actually work.

That is if Jim Gettys and OLPC can eliminate more wasteful processes. How is this one for an odd wasteful process throwback to the days of PS/2 peripherals:

"the [Linux] kernel waking up 20 times/second just to see if PS/2 devices had been hotplugged on 8042 devices (the laptop I type this on, and the OLPC machine, use PS/2 internally but have no external PS/2 connectors, so waking up 20 times a second to see if something has been plugged in that can’t be plugged in seems a bit pointless.)"
So much on a modern commercial laptop seems pointless and every pointless activity wastes precious battery life. I really do hope that we see OLPC's hardware and software breakthroughs trickling up to high-end portable computers soon - if just for the faster suspend/resume

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  • Oh, come on Michael. Do you really think anything that was said on OLPC News would have had much …

    Comment on Goodbye One Laptop per Child

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  • Hi!

    I bought 2 "Tablets OLPC." I had to return because the two did not work. O …

    Comment on The XO Tablet - A First Impression in 750 Words

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  • Dear sir
    I have one question to sir?

    -1 why XO Tablet children play OK but when h …

    Comment on The XO Tablet - A First Impression in 750 Words

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  • Dear sir
    I have one question to sir?

    -1 why XO Tablet children play OK but when h …

    Comment on The XO Tablet - A First Impression in 750 Words

  • Warning: Use of undefined constant title - assumed 'title' (this will throw an Error in a future version of PHP) in /nfs/c03/h05/mnt/54379/domains/olpcnews.com/html/includes_c/sidebar.html on line 1473

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  • Dear sir
    I have one question to sir?

    -1 why XO Tablet children play OK but when h …

    Comment on Guest Post: My XO Tablet Technical Review and First Impressions

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  • Bonjour Mokifisi!
    Je suis bien d'accord avec vous. Je travaille depuis 4 ans dans un petit …

    Comment on The XO Tablet - A First Impression in 750 Words

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  • You just follow the same route upstream how you got the 2XO Tablets? How did you get them? Bring …

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  • quelle adresse envoyer mes deux XOTablet qui ne fonctionnent pas?

    At what address to s …

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  • That's called "Death on arrivals". They happen. That's why there's always some additio …

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  • What is a shelf XO? If you tell me what did you buy and from whom, perhaps I will have a suggest …

    Comment on Goodbye One Laptop per Child

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  • Voici mon message en franais...

    Bonjour,
    Je viens d'acheter 2 tablettes XO. Les d …

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  • I just bought 2 shelves XO. Both tablets are not working. One does not start and the other touch …

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  • I just bought 2 shelves XO. Both tablets are not working. One does not start and the other touch …

    Comment on Goodbye One Laptop per Child

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  • I just bought 2 shelves XO. Both tablets are not working. One does not start and the other touch …

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  • OLPC is not death; eg. this One Laptop per Child San Francisco (OLPC-SF) June 21, 2014 Meeting a …

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