On Apr 27, 2012, at 9:53 AM, Jeff Moyer wrote: > Chris Murphy <lists@xxxxxxxxxxxxxxxxx> writes: > >> Normally top reports CPU line, sy at 0.4% when idle. If I format an >> external Firewire disk as btrfs and mount it, it remains at 0.4%. If I >> reformat as XFS and mount it, again top reports sy at 0.4%. However, >> if I reformat as ext4 and mount it, sy runs at 3.5%. These two >> processes are now at the top of top's results: >> >> kworker/1:2 >> kworker/0:4 >> >> Each uses on average 1.9% CPU. The light on the external drive flashes >> 4x per second. There are no processes using the disk at all while this >> is going on. If I umount it, the pulsing stops. If I remount it, the >> pulsing resumes as does the slightly higher CPU consumption. >> >> This doesn't happen with the same hardware mounted XFS or btrfs or >> HFS+. >> >> Odd? > > Sounds like lazy itable init. Try mkfs -t ext4 -E lazy_itable_init=0. This is happening on internal disks, targeted for Fedora installation. I can hear it once install is complete, still booted from DVD media. Is this a bug? Chris Murphy -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
