From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from plane.gmane.org ([80.91.229.3]:43250 "EHLO plane.gmane.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753136AbbGGM2T (ORCPT ); Tue, 7 Jul 2015 08:28:19 -0400 Received: from list by plane.gmane.org with local (Exim 4.69) (envelope-from ) id 1ZCRyu-0007jy-RZ for linux-btrfs@vger.kernel.org; Tue, 07 Jul 2015 14:28:12 +0200 Received: from HSI-KBW-217-008-058-175.hsi.kabelbw.de ([217.8.58.175]) by main.gmane.org with esmtp (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 07 Jul 2015 14:28:12 +0200 Received: from wb by HSI-KBW-217-008-058-175.hsi.kabelbw.de with local (Gmexim 0.1 (Debian)) id 1AlnuQ-0007hv-00 for ; Tue, 07 Jul 2015 14:28:12 +0200 To: linux-btrfs@vger.kernel.org From: David Weber Subject: Re: WARNING: at /fs/btrfs/extent-tree.c:4029 =?utf-8?b?YnRyZnNfZnJlZV9yZXNlcnZlZF9kYXRhX3NwYWNl?= Date: Tue, 7 Jul 2015 12:28:07 +0000 (UTC) Message-ID: References: <6617728.KSCQs1dauk@o3-3> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Sender: linux-btrfs-owner@vger.kernel.org List-ID: Lutz Vieweg 5t9.de> writes: > > On 06/30/2015 11:10 AM, David Weber wrote: > > I use Btrfs with regular snapshots on my workstation with Virtualbox since > > years. Running filefrag on the image doesn't complete after hours but the > > IO of the VM is still "fast enough". But the definition of "fast enough" > > can vary heavily. > > How do you backup the VM images? If filefrag takes hours to complete, > I'd assume that attempting a sequential read of the whole file (from a > backup software) takes just as long. I use send/receive. With an SSD it doesn't take that long. > > > If it becomes to slow I will try a btrfs fi deframent or just recreate the > > image with a no reflink copy. > > Chances are this will also take hours. A sequential read (dd if=Windows7.vdi of=/dev/zero bs=1M) gives nearly raw SSD Speed. But CPU consumption is indeed quite high... > > Regards, > > Lutz Vieweg