On Sat, Mar 2, 2013 at 9:49 PM, intrigeri <[email protected]> wrote: > If these settings were seriously > wrong, I guess we would have seen quite a lot of bug reports in Debian > during the Wheezy development cycle.
Like these? Just a few examples. http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=684241 https://bugs.launchpad.net/ubuntu/+source/hdparm/+bug/913050 > Given we have not, I'm quite > confident these settings are good enough... until I'm shown why this > is wrong, which Maxim is apparently willing to do. Well, I experienced the problem with -B127 first-hand on a laptop, the result was equivalent to -B1 below. > I guess you're talking of this part of the commit: > >> +# NOTE: many laptop drives support only values 1, 128, 254, 255, >> +# with 1 resulting in immediate spindown after each access > > ... that apparently explains why you moved away from using 127 on AC > power and 1 on battery. That information comes from some extensive online searching — unfortunately, I don't have the links anymore (this happened 1.5 years ago). Hdparm man page is seriously wrong — -B128 does permit spindown (at least on hardware that I tried), when combined with -S. The discussions I found at the time of the commit had extensive information on that, with NOTE above being a short summary. >> Having 254 for everyone on AC is unreasonable, in my opinion. > > I concur with Alan: would you please share some insight about why this > is unreasonable? I don't think hard drives will ever spin down with -B254, even with -S (again, it has been some time, so I might be wrong — I think the laptop on which I saw problems with -B127 never spun down with -B254, so this might not be universally true/untrue). Given that the people recommending use of -B254 don't really understand the issue (e.g., -B128 would fix the issues with a drive constantly going idle from due to -B127 just the same, and sometimes the problems result from using -B255 with older hdparm versions that didn't treat the parameter correctly), I would say that -B128 is the correct value to use, when -S is also specified (which laptop-mode does for IDLE_TIMEOUT parameters). -- Maxim Kammerer Liberté Linux: http://dee.su/liberte _______________________________________________ tails-dev mailing list [email protected] https://mailman.boum.org/listinfo/tails-dev
