Hello, currently my computer freezes every several seconds for half a second or so. Using it feels like I'm playing musical chairs with the kernel. I have just one download happening on utorrent right now - this is what the graph looks like: http://i.imgur.com/LqhMtrJ.png and every time a new spike happens, a freeze happens just before that... that's the only time those freezes happen, too.
Please advise. On Mon, Oct 26, 2015 at 7:31 PM, cheater00 . <cheate...@gmail.com> wrote: > I do not experience btrfs-transacti going up to 100% for minutes at a > time now (not reproduced yet) but I have it spiking up to say 30% for > a short while and everything jags during that time. So, say, if I am > watching youtube, the sound cuts out and the video drops out for a > bit. And if I'm typing, then what I typed during that time gets lost, > like if I never typed that. > > I have also connected the same HDD bay with a USB3 cable instead of > USB2. It's on an USB3 port. So it's running via USB3 now. > > > On Mon, Oct 26, 2015 at 6:43 PM, cheater00 . <cheate...@gmail.com> wrote: >> So far I cannot reproduce. If I don't post again this means the issue >> has been fixed by updating the kernel. >> >> On Mon, Oct 26, 2015 at 4:40 PM, cheater00 . <cheate...@gmail.com> wrote: >>> I have located 4.3.0-rc7 binaries which I will now try. >>> >>> On Mon, Oct 26, 2015 at 3:38 PM, cheater00 . <cheate...@gmail.com> wrote: >>>> Thanks for the reply. What version did this go into? I'll try getting >>>> a prebuilt backport of the kernel, building source could slow things >>>> down considerably, but debs will not be available for the latest few >>>> minor versions I guess. So if you can tell me a min version, I'll try >>>> to find the latest deb newer than that, or I'll build if that's not >>>> available. >>>> >>>> On Mon, Oct 26, 2015 at 3:25 PM, Liu Bo <bo.li....@oracle.com> wrote: >>>>> On 10/26/2015 08:16 PM, cheater00 . 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. >>>>> >>>>> >>>>> It might be related to delayed ref rework, the last time I saw this kind >>>>> of >>>>> hanging problem about btrfs-transaction eating cpu is that because btrfs >>>>> doesn't merge delayed refs, it'd be best to try the lastest kernel and if >>>>> the issue is not resolved, then we can work out a reproducer and provide >>>>> debugging. >>>>> >>>>> Thanks, >>>>> >>>>> Liubo -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
