On Mon, Oct 23, 2017, 3:13 PM Hans de Goede <hdego...@redhat.com> wrote:
> Hi, > > On 21-10-17 20:50, Kevin Fenzi wrote: > > On 09/14/2017 04:22 AM, Hans de Goede wrote: > >> Hi All, > >> > >> My next project for Red Hat is to work on improving Linux laptop battery > >> life. > >> Part of the (hopefully) low hanging fruit here is using kernel tunables > to > >> enable more runtime powermanagement. My first target here is SATA Link > >> Power > >> Management (LPM) which, as Matthew Garrett blogged about 2 years ago: > >> https://mjg59.dreamwidth.org/34868.html > >> can lead to a significant improvement in battery life. > >> > >> There is only one small problem, there have been some reports that some > >> disks/SSDs don't play well with Linux' min_power LPM policy and that > this > >> may lead to system crashes and even data corruption. > >> > >> As such I've written a new LPM policy, which matches the > power-management > >> defaults from the Intel RST Windows drivers. Since it mimicks Windows, > >> this new policy will hopefully not hit any SSD firmware bugs like > min_power > >> sometimes does. > >> > >> So now I'm looking for people with a laptop with a SATA SSD or HDD to > help > >> me test this to make sure this won't cause any issues when we enable > this > >> by default for F28, for more details and test instructions see: > >> > >> https://hansdegoede.livejournal.com/18412.html > > > > Hey Hans. I had marked this to try and do to help gather info, but > > things have been busy and I haven't ever gotten to it. > > > > I thought before I did I might ask if you already have the info you were > > looking for since it's been over a month now. > > > > How have reports been? Is it perhaps time to enable this in rawhide? > > I've had successful test reports from 10 people, of which 1 person > was actually seeing data corruption on his ssd with min_power and not > with the new med_power_with_dipm policy my patches add, which is good > news really :) > > But 10 testers is not that much, so if you still feel like testing this, > then some more testing would definitely be welcome. > I'm curious what the manifestation of corruption is, and whether any on the 10 were using Btrfs? Chris Murphy >
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