On Wednesday 2021-01-13 15:41, Takashi Iwai wrote:
It is the dracut initrd regeneration for me actually, even on SSD it takes *minutes* :).
That's a long-standing pain, yeah. Did anyone profile the dracut operation to point out what takes so long? I know xz takes quite some time, but it's not dominant, I guess.
Quite the contrary. Intel 8250U, Leap, dracut 049, initramfs slightly fatter due to dm_crypt etc. defaults (xz -0 --check=crc32 --memlimit-compress=50) 9.7s compress=cat 8.6s ... 29.91MB compress="zstd -T0" 9.4s compress="xz -6 -T0" 18.5s Compression makes up 11%. Intel 4700U, Tumbleweed du jour, dracut 051 defaults (xz --check=crc32 --lzma2=dict=1MiB -T0) 10.4s compress=cat 7.5s ... 38.0MB compress="zstd -T0" 7.7s compress="xz -6 -T0" 17.9s Compression is 27%. AMD 5700X, Tumbleweed du jour defaults (xz --check=crc32 --lzma2=dict=1MiB -T0) 5.2s compress=cat 3.6s ... 26.7MB compress="xz -6 -T0" 10.3s Compression makes up 30%.