** Description changed: Use `lz4 -9 -l` compression for initramfs by default as discussed on ubuntu-devel. This would also pull the lz4 package into main https://lists.ubuntu.com/archives/ubuntu-devel/2019-June/040726.html + + [Regression Potential] + + We are trying to optimize for total boot speed, but performing a micro- + optimization upon time to create/unpack kernel/initrd is an insufficient + benchmark for total boot speed. This is because it ignores time to load + the kernel/initrd, and whether the firmware/bootloader were able to + stream decompress it whilst loading it. I.e. it is argued that in the + real world, subsecond decompression gains are irrelevant if UEFI + firmware, tftp boot, etc. take a lot longer than that to read extra 10s + of MBs of boot material. + + [TODO] + Measure pure i/o load speed with stopwatch, to figure out MB/s speed of loading initrds/kernel off FAT32, EXT4, TFTP, HTTP. + Re-evaluate if we should provide different compression mechanisms: + - ie. gzip instead of lz4 for most cases (revert) + - ie. xz for painful i/o cases (e.g. netboot)
-- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1831736 Title: [MIR] lz4 by default To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/initramfs-tools/+bug/1831736/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
