Re: slow btrfs with a single kworker process using 100% CPU

["Konstantin V. Gavrilenko" <k.gavrilenko@arhont.com>]

Could be similar issue as what I had recently, with the RAID5 and 256kb chunk size.

please provide more information about your RAID setup.

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@profihost.ag>
To: "Marat Khalili" <mkh@rqc.ru>, linux-btrfs@vger.kernel.org
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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