Accidentally didn't reply to the list the 1st time. I see the same issue when I have quotas enabled. If you have quotas on, see if turning them off helps. On Mon, Oct 26, 2015 at 7:16 AM, cheater00 . <cheater00@xxxxxxxxx> wrote: > Hi guys, > I am running into really bad performance. Here's my setup: > > WD Red 6 TB connected over USB2 to my core i7 laptop, running Ubuntu > 32-bit with kernel 4.0.4-040004-generic #201505171336. > > Single btrfs partition covering whole disk. > > Autodefrag is on. > > fstab line: > UUID=... /media/X btrfs rw,nosuid,nodev,autodefrag 0 0 > > Sometimes when files are being modified or removed, I see > btrfs-transacti eat 100% cpu; during this time no io operations > succeed, that is, they're all stalled. You can't even ls on that fs. > This happens for several minutes then normal operation resumes. There > doesn't seem to be a rule to what will trigger this, other than > opening a single file and reading usually works quite well. (say, > watching a movie while all other programs are closed). But even moving > files off the disks triggers some sort of bug. Just now I am moving a > few files (just 30gb worth) onto another disk, and the bug triggers. > So btrfs-transacti was eating my cpu for over 5 minutes and according > to mv's output after this was done and cpu usage went back to normal > what I was waiting for was for a tiny png file to be removed. This is > pretty bad. > > I have tried defragmenting directories where files are being accessed > and moved. This hasn't helped. > > This happens whether the FS is near full or not. It currently is near > full but it wasn't before and it still did that. It still has about ~ > 100GB free space now. > > The more things are happening the more often this bug gets triggered. > So if I have utorrent running and its temporary downloads directory is > there, its download speed graph will be a few spikes of running at > several MB/sec separated by durations of 0 download speed. > > Nothing seems to show up in dmesg or syslog. > > I have asked in #btrfs but the suggestions ended up not fixing the > issue (autodefrag, defrag dirs). > > Please advise what I should do with this issue. > -- > To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
