Re: [Powertop] HIgh power concumption on network interface
Wout Mertens <wout.mertens at gmail.com>
| Newsgroups | dev.linux.lists.powertop |
|---|---|
| Message-ID | <CAO3V83+w2XL8aSAoLNbqrw4ArRVV+HSq1RpQaA4=Zm_oN2ueBw@mail.gmail.com> |
Alright I'll give that a shot, thanks! As a side question though, is 20W a reasonable idle power consumption for a high-end recent laptop? Cheers, Wout. On Feb 19, 2014 7:53 PM, "Kok, Auke-jan H" <auke-jan.h.kok(a)intel.com> wrote: > > > > On Wed, Feb 19, 2014 at 1:13 AM, Wout Mertens <wout.mertens(a)gmail.com>wrote: > >> kingma at bluewin.ch wrote on Wed Feb 12 23:32:27 PST 2014: >> >> > I observe a sustained high power consumption of 5- 10 W on the ehternet >> adaptor e1000e on a lenovo thinkgpad t430s. Such I high power drain cannot >> be correct can it? the total power consumption is around 25 W which is a >> concern for battery life. >> >> I'm noticing the same thing on my Dell Latitude E6540. It also has an >> e1000 and powertop reports it as being the highest consumer, at around 15W. >> When I unplug the system, the battery reports a drain of about 20W while >> idle which is pretty bad IMHO. With the 68Wh battery it translates to about >> 2.5 hours battery life. >> >> Lowest I've seen for battery drain is 14W, with the screen at lowest >> brightness, Google Chrome turned off, disk spun down. I'm using the >> built-in Intel graphics and the system has 16GB of ram and a quad-core i7. >> >> I never ran windows on this laptop so I don't know what to expect but >> reviews are claiming 7+ hours on the 90Wh battery. That would mean an >> average of 13W, while doing actual work. >> >> So I'm really wondering: Is the e1000 really eating up 15W or is powertop >> misreporting? >> > > > There have been plenty of reports that point to the calibration being > incomplete (Let's just call it that). > > Obviously e1000 won't eat 15W of power - 15W could power a 10gig Fiber > Optic transceiver (a high-powered laser, basically). Power consumption is > more in the order of a few watts max, with idle power much, much lower. > > Calibration could fail if during the calibration phase powertop is unable > to toggle power to components or enable/disable devices. As a fallback, you > can run the calibration multiple times and vary the enabled devices in the > system. You could for instance go into the BIOS and disable the ethernet > device entirely, calibrate, reboot and enable the ethernet device, then > calibrate again. The extra data points should improve the power estimates > for devices. > > Cheers, > > Auke > >
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<p dir="ltr">Alright I'll give that a shot, thanks!</p> <p dir="ltr">As a side question though, is 20W a reasonable idle power consumption for a high-end recent laptop?</p> <p dir="ltr">Cheers,</p> <p dir="ltr">Wout.</p> <div class="gmail_quote">On Feb 19, 2014 7:53 PM, "Kok, Auke-jan H" <<a href="mailto:[email protected]">[email protected]</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"> <div dir="ltr"><div><br></div><div class="gmail_extra"><br><br><div class="gmail_quote">On Wed, Feb 19, 2014 at 1:13 AM, Wout Mertens <span dir="ltr"><<a href="mailto:[email protected]" target="_blank">[email protected]</a>></span> wrote:<br> <blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204,204);border-left-style:solid;padding-left:1ex"><div dir="ltr">kingma at <a href="http://bluewin.ch" target="_blank">bluewin.ch</a> wrote on Wed Feb 12 23:32:27 PST 2014:<div> <div><br></div><div>> I observe a sustained high power consumption of 5- 10 W on the ehternet adaptor e1000e on a lenovo thinkgpad t430s. Such I high power drain cannot be correct can it? the total power consumption is around 25 W which is a concern for battery life.</div> <div><br></div></div><div>I'm noticing the same thing on my Dell Latitude E6540. It also has an e1000 and powertop reports it as being the highest consumer, at around 15W. When I unplug the system, the battery reports a drain of about 20W while idle which is pretty bad IMHO. With the 68Wh battery it translates to about 2.5 hours battery life.</div> <div><br></div><div>Lowest I've seen for battery drain is 14W, with the screen at lowest brightness, Google Chrome turned off, disk spun down. I'm using the built-in Intel graphics and the system has 16GB of ram and a quad-core i7.</div> <div><br></div><div>I never ran windows on this laptop so I don't know what to expect but reviews are claiming 7+ hours on the 90Wh battery. That would mean an average of 13W, while doing actual work.</div><div><br></div> <div>So I'm really wondering: Is the e1000 really eating up 15W or is powertop misreporting?</div></div></blockquote></div></div><div class="gmail_extra"><div><br></div><div><br>There have been plenty of reports that point to the calibration being incomplete (Let's just call it that).</div> <div><br></div><div>Obviously e1000 won't eat 15W of power - 15W could power a 10gig Fiber Optic transceiver (a high-powered laser, basically). Power consumption is more in the order of a few watts max, with idle power much, much lower.</div> <div><br></div><div>Calibration could fail if during the calibration phase powertop is unable to toggle power to components or enable/disable devices. As a fallback, you can run the calibration multiple times and vary the enabled devices in the system. You could for instance go into the BIOS and disable the ethernet device entirely, calibrate, reboot and enable the ethernet device, then calibrate again. The extra data points should improve the power estimates for devices.</div> <div><br></div><div>Cheers,</div><div><br></div><div>Auke</div><div><br></div></div></div> </blockquote></div>