From mboxrd@z Thu Jan 1 00:00:00 1970 From: Arnout Vandecappelle Date: Thu, 06 Feb 2014 18:11:04 +0100 Subject: [Buildroot] Why can't I see any effects by different rootfs compression methods ?? In-Reply-To: <52F361B10200004600049F5D@gwia2.rz.hs-offenburg.de> References: <52F361B10200004600049F5D@gwia2.rz.hs-offenburg.de> Message-ID: <52F3C228.2080002@mind.be> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net On 06/02/14 10:19, Frank Ihle wrote: > Hi, > > I'm using Buildroot to generate a uImage with a kernel, which in the end > starts busybox. I tried the different compression modes (kernel > compression, built-in initramfs compression and the rootfs compression). > The first 2 options worked quiet well but when it comes to apply > different compression methodes (e.g. LZMA, bzip2) on rootfs in make > menuconfig nothing changes, neither size nor decompress time. > > Why is it like that ? And how can I extract files of the generated > uImage, so that i can see what really has been compressed ? The rootfs compression only affects the rootfs image that is generated in output/images, not the initramfs that is linked into the kernel. The latter is purely controlled by kernel options (which you did). Note that built-in initramfs compression is pointless, because it will be compressed again with the kernel compression method - and that usually increases the size rather than decreasing it. Regards, Arnout -- Arnout Vandecappelle arnout at mind be Senior Embedded Software Architect +32-16-286500 Essensium/Mind http://www.mind.be G.Geenslaan 9, 3001 Leuven, Belgium BE 872 984 063 RPR Leuven LinkedIn profile: http://www.linkedin.com/in/arnoutvandecappelle GPG fingerprint: 7CB5 E4CC 6C2E EFD4 6E3D A754 F963 ECAB 2450 2F1F