Am 16.08.2017 um 11:02 schrieb Konstantin V. Gavrilenko:
> Could be similar issue as what I had recently, with the RAID5 and 256kb chunk size.
> please provide more information about your RAID setup.
Hope this helps:
# cat /proc/mdstat
Personalities : [raid1] [raid6] [raid5] [raid4] [linear] [multipath]
[raid0] [raid10]
md0 : active raid5 sdd1[1] sdf1[4] sdc1[0] sde1[2]
11717406720 blocks super 1.2 level 5, 512k chunk, algorithm 2
[4/4] [UUUU]
bitmap: 6/30 pages [24KB], 65536KB chunk
md2 : active raid5 sdm1[2] sdl1[1] sdk1[0] sdn1[4]
11717406720 blocks super 1.2 level 5, 512k chunk, algorithm 2
[4/4] [UUUU]
bitmap: 7/30 pages [28KB], 65536KB chunk
md1 : active raid5 sdi1[2] sdg1[0] sdj1[4] sdh1[1]
11717406720 blocks super 1.2 level 5, 512k chunk, algorithm 2
[4/4] [UUUU]
bitmap: 7/30 pages [28KB], 65536KB chunk
md3 : active raid5 sdp1[1] sdo1[0] sdq1[2] sdr1[4]
11717406720 blocks super 1.2 level 5, 512k chunk, algorithm 2
[4/4] [UUUU]
bitmap: 6/30 pages [24KB], 65536KB chunk
# btrfs fi usage /vmbackup/
Overall:
Device size: 43.65TiB
Device allocated: 31.98TiB
Device unallocated: 11.67TiB
Device missing: 0.00B
Used: 30.80TiB
Free (estimated): 12.84TiB (min: 12.84TiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 512.00MiB (used: 0.00B)
Data,RAID0: Size:31.83TiB, Used:30.66TiB
/dev/md0 7.96TiB
/dev/md1 7.96TiB
/dev/md2 7.96TiB
/dev/md3 7.96TiB
Metadata,RAID0: Size:153.00GiB, Used:141.34GiB
/dev/md0 38.25GiB
/dev/md1 38.25GiB
/dev/md2 38.25GiB
/dev/md3 38.25GiB
System,RAID0: Size:128.00MiB, Used:2.28MiB
/dev/md0 32.00MiB
/dev/md1 32.00MiB
/dev/md2 32.00MiB
/dev/md3 32.00MiB
Unallocated:
/dev/md0 2.92TiB
/dev/md1 2.92TiB
/dev/md2 2.92TiB
/dev/md3 2.92TiB
Stefan
>
> p.s.
> you can also check the tread "Btrfs + compression = slow performance and high cpu usage"
>
> ----- Original Message -----
> From: "Stefan Priebe - Profihost AG" <s.priebe@xxxxxxxxxxxx>
> To: "Marat Khalili" <mkh@xxxxxx>, linux-btrfs@xxxxxxxxxxxxxxx
> Sent: Wednesday, 16 August, 2017 10:37:43 AM
> Subject: Re: slow btrfs with a single kworker process using 100% CPU
>
> Am 16.08.2017 um 08:53 schrieb Marat Khalili:
>>> I've one system where a single kworker process is using 100% CPU
>>> sometimes a second process comes up with 100% CPU [btrfs-transacti]. Is
>>> there anything i can do to get the old speed again or find the culprit?
>>
>> 1. Do you use quotas (qgroups)?
>
> No qgroups and no quota.
>
>> 2. Do you have a lot of snapshots? Have you deleted some recently?
>
> 1413 Snapshots. I'm deleting 50 of them every night. But btrfs-cleaner
> process isn't running / consuming CPU currently.
>
>> More info about your system would help too.
> Kernel is OpenSuSE Leap 42.3.
>
> btrfs is mounted with
> compress-force=zlib
>
> btrfs is running as a raid0 on top of 4 md raid 5 devices.
>
> Greets,
> Stefan
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