From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail1.arhont.com ([178.248.108.132]:50401 "EHLO mail.arhont.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751068AbdHPJCR (ORCPT ); Wed, 16 Aug 2017 05:02:17 -0400 Date: Wed, 16 Aug 2017 10:02:17 +0100 (BST) From: "Konstantin V. Gavrilenko" To: Stefan Priebe - Profihost AG Cc: Marat Khalili , linux-btrfs@vger.kernel.org Message-ID: <4669553.344.1502874134710.JavaMail.gkos@dynomob> In-Reply-To: <064eaaed-7748-7064-874e-19d270d0854e@profihost.ag> References: <4772c3f2-0074-d86f-24c4-02ff0730fce7@rqc.ru> <064eaaed-7748-7064-874e-19d270d0854e@profihost.ag> Subject: Re: slow btrfs with a single kworker process using 100% CPU MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: 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" To: "Marat Khalili" , 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 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html