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The Linux Kernel Is Still On A Power Binge

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  • The Linux Kernel Is Still On A Power Binge

    Phoronix: The Linux Kernel Is Still On A Power Binge

    It's been about three weeks since last mentioning the major power consumption problem in the Linux kernel (actually, there's more than one power regression) and it's affecting distributions like Ubuntu 11.04. The lack of mentioning the power regression in recent weeks isn't though because the regressions are addressed, they are still outstanding with the about to be released Linux 2.6.39 kernel...

    http://www.phoronix.com/vr.php?view=OTQ1Ng

  • #2
    You need test rc kernels.

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    • #3
      Doesn't apcupsd do what you want?
      ## VGA ##
      AMD: X1950XTX, HD3870, HD5870
      Intel: GMA45, HD3000 (Core i5 2500K)

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      • #4
        Does anyone already heard about smartenergygroups.com ?

        Seems like an open source/open hardware energy monitoring solution. You can build your own or buy it for 600 to 700$ (yeah, quite expensive). I'm pretty sure it could do what you want by clipping a sensor around the power cable of your computer.

        I was looking for the same thing some days ago but still not managed to find a cheap solution to directly log my watt consumption to my computer. All wattmeters either have a small display or log the data BUT you have to transfer it to your pc... (but those wattmeters are cheaper)

        Also found those wattmeters: https://www.wattsupmeters.com/secure/products.php?pn=0
        Still expensive, around 200$, you'll need to save a lot of energy to have any ROI on such an investment

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        • #5
          You were going to bisect, how did that go or still ongoing?

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          • #6
            instead of a ups how about one of these
            http://www.amazon.com/Watts-Up-Pro-P.../dp/B000QZ1WY2

            it has usb connection and iirc there is a linux program that fetches data
            and its prob alot more accurate than any ups would be

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            • #7
              Watts-Up Pro also has support in upower.
              Also take a look at this:
              http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=586751

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              • #8
                Originally posted by blaze33 View Post
                I was looking for the same thing some days ago but still not managed to find a cheap solution to directly log my watt consumption to my computer. All wattmeters either have a small display or log the data BUT you have to transfer it to your pc... (but those wattmeters are cheaper)
                Point a webcam at your wattmeter and then ocr the image sequences or video stream

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                • #9
                  apcupsd works great

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                  • #10
                    I wonder if this also affects BFS-patched kernels.

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                    • #11
                      Darn it. I was hoping a quick fix for this would have made it in before release. It's the only thing holding me back from jumping to Ubuntu 11.04 to see the what the big hoopla is over Unity. Can't spare the loss in run time with my 3+ year old battery on my laptop :-(

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                      • #12
                        Originally posted by tweak42 View Post
                        Darn it. I was hoping a quick fix for this would have made it in before release. It's the only thing holding me back from jumping to Ubuntu 11.04 to see the what the big hoopla is over Unity. Can't spare the loss in run time with my 3+ year old battery on my laptop :-(
                        .


                        My wireless driver is bundled with the natty kernel so I am hoping every day to see that there is a fix for it. I am okay surfing the web but I do not do any multitasking purposely as this is a new dell xps laptop and I don't want to take any chances. I did encode a video earlier with nothing else opened and my fan ran on high immediately. My temps shot up so fast it was crazy. I have never had this issue before in my 3 years running linux.

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                        • #13
                          Originally posted by z06gal View Post
                          .


                          My wireless driver is bundled with the natty kernel so I am hoping every day to see that there is a fix for it. I am okay surfing the web but I do not do any multitasking purposely as this is a new dell xps laptop and I don't want to take any chances. I did encode a video earlier with nothing else opened and my fan ran on high immediately. My temps shot up so fast it was crazy. I have never had this issue before in my 3 years running linux.
                          Regardless of multitasking, high temps would be expected with video encoding since it's one of the apps today that run a cpu full out. The issue here is significant loss of battery life from old kernel to new kernel, because a kernel regression is not letting cpu power back to idle when doing low cpu intensive tasks such as when you are browsing the web. Do you have one of the XPS laptops running Nvidia Optimus?

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                          • #14
                            Originally posted by tweak42 View Post
                            Regardless of multitasking, high temps would be expected with video encoding since it's one of the apps today that run a cpu full out. The issue here is significant loss of battery life from old kernel to new kernel, because a kernel regression is not letting cpu power back to idle when doing low cpu intensive tasks such as when you are browsing the web. Do you have one of the XPS laptops running Nvidia Optimus?

                            Yes! That is exactly what I have. I quit even using my battery because it lasted no time. I did not realize that though about encoding so I think I'm okay. Thanks



                            Robin

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                            • #15
                              Looks like Micheal is back at bisecting it and actually finding stuff. Very, very nice.

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