From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:54502 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754733Ab3GTWsF (ORCPT ); Sat, 20 Jul 2013 18:48:05 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1V0fwY-00089n-Li for linux-btrfs@vger.kernel.org; Sun, 21 Jul 2013 00:48:02 +0200 Received: from pro75-5-88-162-203-35.fbx.proxad.net ([88.162.203.35]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 21 Jul 2013 00:48:02 +0200 Received: from g2p.code by pro75-5-88-162-203-35.fbx.proxad.net with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Sun, 21 Jul 2013 00:48:02 +0200 To: linux-btrfs@vger.kernel.org From: Gabriel de Perthuis Subject: Re: Lots of harddrive chatter on after booting with btrfs on root (slow boot) Date: Sat, 20 Jul 2013 22:47:46 +0000 (UTC) Message-ID: References: Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On Sat, 20 Jul 2013 17:15:50 +0200, Jason Russell wrote: > Ive also noted that this excessive hdd chatter does not occur > immediately after a fresh format with arch on btrfs root. > > Ive made some deductions/assumptions: > This only seems to occur with btrfs roots. > This only happens after some number of reboots OR after the partition > fills up a little bit. > Im pretty sure of ruled out everything except for the filesystem. In my experience (as of 3.8 or so), Btrfs performance degrades on a filled-up filesystem, even a comparatively new one. Various background workers start to eat io according to atop. > I have just done two clean installs to more thoroughly compare ext4 > and btrfs roots. So far no excessive hdd chatter from btrfs. > > I have also seen what I have described on two other computers > (different hardware entirely) where there is lots of hdd chatter from > btrfs root, and nothing from ext4. > > Here are two threads: > https://bbs.archlinux.org/viewtopic.php?pid=1117932 > https://bbs.archlinux.org/viewtopic.php?pid=1301684