From mboxrd@z Thu Jan 1 00:00:00 1970 From: Calvin Walton Subject: Re: Horrible btrfs performance on cold cache Date: Mon, 11 Oct 2010 11:46:19 -0400 Message-ID: <1286811979.9645.5.camel@ayu> References: Mime-Version: 1.0 Content-Type: text/plain; charset="UTF-8" Cc: Linux Kernel Mailing List , linux-btrfs@vger.kernel.org, Chris Mason To: Felipe Contreras Return-path: In-Reply-To: List-ID: On Mon, 2010-10-11 at 03:30 +0300, Felipe Contreras wrote: > Hi, > > I use btrfs on most of my volumes on my laptop, and I've always felt > booting was very slow, but definitely sure is slow, is starting up > Google Chrome: > > encrypted ext4: ~20s > btrfs: ~2:11s > > I have tried different things to find out exactly what is the issue, > but haven't quite found it yet. If you've been using this volume for a while, it could just have become badly fragmented. You could try btrfs's fancy online defragmentation abilities to see if that'll give you an improvement: # btrfs filesystem defragment /mountpoint/of/volume Let us know if that helps, of course :) -- Calvin Walton