Control: tag -1 +moreinfo Hi Wolfgang,
Thank you for filing this bug, I'm always happy to hear from users, and a bug is an opportunity to improve something! On Mon, Sep 10, 2018 at 08:58:03AM +0100, Wolfgang Weisselberg wrote: > Package: btrfsmaintenance > Version: 0.4.1-3 > Severity: normal > Tags: patch > > Dear Maintainer, > > BTRFS_SCRUB_PRIORITY="idle" (or not setting it at all) in > /etc/default/btrfsmaintenance should cause > /usr/share/btrfsmaintenance/btrfs-scrub.sh to start scrub > with idle IO priority. > > But it starts it with the default IO priority like any other > job. > > The reason seems to be that the default value for ioprio > is not set: [ text from patch and System Information ] From 'man btrfs-scrub', "The default IO priority of scrub is the idle class", thus 'btrfs-scrub' should default to the idle class when $ioprio is nil. eg: ioprio= btrfs scrub start -Bd $ioprio / # is equivalent to # btrfs scrub start -Bd / # which should default to -c 3 (idle) The idle priority might not be applied for other reasons. Would you please share the output to the following commands: First, please unapply your patch or reinstall btrfsmaintenance, since it looks like it is applied to /usr/share/btrfsmaintenance/btrfs-scrub.sh # while a btrfsmaintenance scheduled scrub is running ionice -p `pidof btrfs-scrub` # and cat /sys/block/sd*/queue/scheduler # and cat /sys/module/*/parameters/use_blk_mq Cheers, Nicholas
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