** Description changed: + Feature Freeze Justification + ============================ + + Initramfs-tools uses gzip compression by default which served us well + for quite some time but LZ4 offers way faster decompression while + making a only slightly bigger initramfs files. + + Having lz4 supported by initramfs-tools would allow users to opt-in for + faster boot in Bionic from day 1. + + On my old laptop the initramfs extraction time decreased from ~1.2s to ~0.24s: + (with lz4) + kernel: [ 0.285692] Unpacking initramfs... + kernel: [ 0.518806] Freeing initrd memory: 65148K + kernel: [ 0.289731] Unpacking initramfs... + kernel: [ 0.522823] Freeing initrd memory: 65148K + (with gzip) + kernel: [ 0.273748] Unpacking initramfs... + kernel: [ 1.490066] Freeing initrd memory: 57140K + kernel: [ 0.281729] Unpacking initramfs... + kernel: [ 1.498493] Freeing initrd memory: 57140K + + Discussion on ubuntu-devel: + https://lists.ubuntu.com/archives/ubuntu-devel/2018-March/040258.html + + IMO the attached patch is minimally intrusive and it is safe to make + this change even at this late hour of the release cycle. + + + Original Bug Text + ================= + I found that I could enable LZ4 compression for initramfs on my vivid machine by installing liblz4-tool package, adding one line to mkinitramfs and installing a kernel compiled with CONFIG_CRYPTO_LZ4=y. Please include support for (legacy) LZ4. Attached patch includes changes made to the latest version (initramfs- tools_0.120ubuntu3).
** Description changed: Feature Freeze Justification ============================ Initramfs-tools uses gzip compression by default which served us well for quite some time but LZ4 offers way faster decompression while making a only slightly bigger initramfs files. Having lz4 supported by initramfs-tools would allow users to opt-in for faster boot in Bionic from day 1. On my old laptop the initramfs extraction time decreased from ~1.2s to ~0.24s: (with lz4) kernel: [ 0.285692] Unpacking initramfs... kernel: [ 0.518806] Freeing initrd memory: 65148K kernel: [ 0.289731] Unpacking initramfs... kernel: [ 0.522823] Freeing initrd memory: 65148K (with gzip) kernel: [ 0.273748] Unpacking initramfs... kernel: [ 1.490066] Freeing initrd memory: 57140K kernel: [ 0.281729] Unpacking initramfs... kernel: [ 1.498493] Freeing initrd memory: 57140K Discussion on ubuntu-devel: https://lists.ubuntu.com/archives/ubuntu-devel/2018-March/040258.html IMO the attached patch is minimally intrusive and it is safe to make this change even at this late hour of the release cycle. + I have uploaded the package to this PPA for testing the build: + https://launchpad.net/~rbalint/+archive/ubuntu/scratch + + I'm also using the updated package on my system. Original Bug Text ================= I found that I could enable LZ4 compression for initramfs on my vivid machine by installing liblz4-tool package, adding one line to mkinitramfs and installing a kernel compiled with CONFIG_CRYPTO_LZ4=y. Please include support for (legacy) LZ4. Attached patch includes changes made to the latest version (initramfs- tools_0.120ubuntu3). ** Changed in: initramfs-tools (Ubuntu) Status: Triaged => New -- You received this bug notification because you are a member of Ubuntu Touch seeded packages, which is subscribed to initramfs-tools in Ubuntu. https://bugs.launchpad.net/bugs/1488620 Title: [FFe] Add LZ4 support to initramfs-tools Status in initramfs-tools package in Ubuntu: New Bug description: Feature Freeze Justification ============================ Initramfs-tools uses gzip compression by default which served us well for quite some time but LZ4 offers way faster decompression while making a only slightly bigger initramfs files. Having lz4 supported by initramfs-tools would allow users to opt-in for faster boot in Bionic from day 1. On my old laptop the initramfs extraction time decreased from ~1.2s to ~0.24s: (with lz4) kernel: [ 0.285692] Unpacking initramfs... kernel: [ 0.518806] Freeing initrd memory: 65148K kernel: [ 0.289731] Unpacking initramfs... kernel: [ 0.522823] Freeing initrd memory: 65148K (with gzip) kernel: [ 0.273748] Unpacking initramfs... kernel: [ 1.490066] Freeing initrd memory: 57140K kernel: [ 0.281729] Unpacking initramfs... kernel: [ 1.498493] Freeing initrd memory: 57140K Discussion on ubuntu-devel: https://lists.ubuntu.com/archives/ubuntu-devel/2018-March/040258.html IMO the attached patch is minimally intrusive and it is safe to make this change even at this late hour of the release cycle. I have uploaded the package to this PPA for testing the build: https://launchpad.net/~rbalint/+archive/ubuntu/scratch I'm also using the updated package on my system. Original Bug Text ================= I found that I could enable LZ4 compression for initramfs on my vivid machine by installing liblz4-tool package, adding one line to mkinitramfs and installing a kernel compiled with CONFIG_CRYPTO_LZ4=y. Please include support for (legacy) LZ4. Attached patch includes changes made to the latest version (initramfs- tools_0.120ubuntu3). To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1488620/+subscriptions -- Mailing list: https://launchpad.net/~touch-packages Post to : touch-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~touch-packages More help : https://help.launchpad.net/ListHelp
