From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from aquinas.techsquare.com ([75.125.237.226]:58629 "EHLO techsquare.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751677AbdLAOqb (ORCPT ); Fri, 1 Dec 2017 09:46:31 -0500 Received: from dhcp-18-189-126-59.dyn.mit.edu ([18.189.126.59]) by techsquare.com with esmtpsa (TLS1.0:DHE_RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1eKmFg-0004uc-VM for linux-btrfs@vger.kernel.org; Fri, 01 Dec 2017 09:25:28 -0500 To: linux-btrfs@vger.kernel.org From: Matt McKinnon Message-ID: Date: Fri, 1 Dec 2017 09:25:14 -0500 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Subject: btrfs-transacti hammering the system Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi All, Is there any way to figure out what exactly btrfs-transacti is chugging on? I have a few file systems that seem to get wedged for days on end with this process pegged around 100%. I've stopped all snapshots, made sure no quotas were enabled, turned on autodefrag in the mount options, tried manual defragging, kernel upgrades, yet still this brings my system to a crawl. Network I/O to the system seems very tiny. The only I/O I see to the disk is btrfs-transacti writing a couple M/s. # time touch foo real 2m54.303s user 0m0.000s sys 0m0.002s # uname -r 4.12.8-custom # btrfs --version btrfs-progs v4.13.3 Yes, I know I'm a bit behind there... -Matt