From: Theodore Ts'o Subject: Re: dump ext4 performance degrades linearly as disk fills Date: Tue, 17 Jun 2014 10:51:29 -0400 Message-ID: <20140617145129.GB5054@thunk.org> References: <539E8401.5000607@josephdwagner.info> <20140616124229.GA8465@thunk.org> <53A04BEB.7000401@josephdwagner.info> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-ext4@vger.kernel.org To: "Joseph D. Wagner" Return-path: Received: from imap.thunk.org ([74.207.234.97]:43043 "EHLO imap.thunk.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932973AbaFQOve (ORCPT ); Tue, 17 Jun 2014 10:51:34 -0400 Content-Disposition: inline In-Reply-To: <53A04BEB.7000401@josephdwagner.info> Sender: linux-ext4-owner@vger.kernel.org List-ID: Hmm, I've looked at your dumpe2fs, and the free space looks pretty good. Was this taken before or after you ran the backup? How big are your full and incremental backups? And were you testing the time when writing an incremental backup or a full backup? Finally, can you use the debugfs program, and then use the debugfs's "extents" commands? i.e. % debugfs /dev/heap/u1 debugfs: extents linux-image-3.15.0-00037-g7428869-dbg_3.15.0-00037-g7428869-86_amd64.deb Level Entries Logical Physical Length Flags 0/ 0 1/ 3 0 - 9 16898520 - 16898529 10 0/ 0 2/ 3 10 - 2047 17518592 - 17520629 2038 0/ 0 3/ 3 2048 - 9881 17500160 - 17507993 7834 debugfs: q ... and send me the output? Thanks!! - Ted