Pádraig Brady wrote: > Pádraig Brady wrote: > > 1. ubuntu dicks with the drive spin down timers when on battery I've heard that by default ubuntu does not mess with these timers, but will if one sets laptop-mode in /etc/default/acpi-support, anyway... > 2. fedora does not (as Bill suggested) > 3. fedora should probably not (as Alan suggested) > 4. fedora should probably default to relatime mount option > on laptops at least (as Ingo suggested here: > http://kerneltrap.org/node/14148 ) As Jeff points out F8 will have relatime configured on by default for all mounts. Yay for sensible defaults! > Noting that this laptop was running FC4 for most of its life, > and that it has the following defaults: > # hdparm -I /dev/sda | grep "Advanced power management level" > Advanced power management level: 128 (0x80) > Using the smart Power_On_Hours value, shows that in total > it has load cycled on average once every 48s: > # echo "scale=2; (4718*60*60)/351675" | bc > 48.29 > > That's far too aggressive, especially considering this > laptop is plugged in most of the time. > But also note that atime updates were enabled (as per default), > which probably exacerbated the problem. > I'll disable that first on all partitions and if that > doesn't suffice I'll make the "unloading" less agressive > using the `hdparam -B $level /dev/sda` command. Disabling atime manually on F7, gets my hard disk [un]load cycle frequency to decrease from once every 48s to once every 108s: $ echo "((4765-4718)*60*60)/(353361-351795)" | bc 108 That's around what I think it should be as a limit, so can we add "anti hard drive ware technology" to the new features in the F8 release notes :) I did also notice a bug which mentions that this issue may be triggered by changes in kernel 2.6.10? https://bugzilla.redhat.com/show_bug.cgi?id=146628 cheers, Pádraig. -- fedora-devel-list mailing list fedora-devel-list@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/fedora-devel-list
