From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 39AD8C433EF for ; Fri, 3 Dec 2021 08:17:06 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1351072AbhLCIU2 (ORCPT ); Fri, 3 Dec 2021 03:20:28 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52424 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238936AbhLCIU2 (ORCPT ); Fri, 3 Dec 2021 03:20:28 -0500 Received: from mail.virtall.com (mail.virtall.com [IPv6:2a01:4f8:141:216f::203]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B2FD1C06173E for ; Fri, 3 Dec 2021 00:17:04 -0800 (PST) Received: from mail.virtall.com (localhost [127.0.0.1]) by mail.virtall.com (Postfix) with ESMTP id E0B509975AA0; Fri, 3 Dec 2021 08:17:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=wpkg.org; s=default; t=1638519422; bh=We2/35FLG5VYTkgG50yCYAdxLj4/sZyJM0r3RYNld6s=; h=Date:From:To:Cc:Subject:In-Reply-To:References; b=S+cJLucu5drRIaZDfCUOSNUxQs4zhgOik4Rh+Btssl66JEr0f34My98fvI8Ct88cX 7cS8QBuS/kWKaWL+M3A0RZWRhavs7FG9jvITYAES/db11rOe0wY6AsUczh+oFAdan1 XnNtYsmsvw+TckQ+b0IrRvXhObz8HL0vlx+/2yMOK4LQ/Sc42kpppYGfG6rjg5qzB1 n8i4X/nmcW97WyJVBhscs8j9Y/aIB793Ubgif2gbrGoEZZZcx9vh0sy4iglP/phe91 q5BVkQNRydgnQWubkqC3tdjwBSUyCD60SjYuHvBrH6tU4JQy+P+zbwlGxsQIq/wDmT jpXNpRr2V3CmA== X-Fuglu-Suspect: d5d9e6ed355a4b248bb5a56d17df6648 X-Fuglu-Spamstatus: NO Received: from localhost (localhost [127.0.0.1]) (Authenticated sender: tch@virtall.com) by mail.virtall.com (Postfix) with ESMTPSA; Fri, 3 Dec 2021 08:17:00 +0000 (UTC) MIME-Version: 1.0 Date: Fri, 03 Dec 2021 09:16:59 +0100 From: Tomasz Chmielewski To: Johannes Thumshirn Cc: Btrfs BTRFS Subject: Re: kworker/u32:5+btrfs-delalloc using 100% CPU In-Reply-To: References: Message-ID: <93111e00ad2e42738d65d426f82ad17f@wpkg.org> X-Sender: mangoo@wpkg.org Content-Type: text/plain; charset=US-ASCII; format=flowed Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-btrfs@vger.kernel.org On 2021-12-03 09:09, Johannes Thumshirn wrote: > On 03/12/2021 00:23, Tomasz Chmielewski wrote: >> On two of my servers running Linux 5.15.5 I can observe >> kworker/u32:5+btrfs-delalloc process using 100% CPU. >> >> The servers receive files with rsync and I suspect that because of >> that >> process using 100% CPU, the speed is very slow, less than 1 MB/s over >> a >> gigabit network. >> > > Hi, > > We're currently working on a similar hang with btrfs on zoned > block devices. Which brings me to the question, are you seeing this > issues > on a zoned device, like an SMR drive, or on a regular device? It's a regular HDD. Tomasz