On Wed, Jun 05, 2019 at 10:48:32PM -0600, Chris Murphy wrote:
I've filed a bug about this, but I'm not sure what else to
test or add
to demonstrate where the problem is coming from. It's some combination
of squashfs + ext4 overhead I'm guessing, but then also the perf
report output on the pid for loop1 shows lzma is the top consumer by a
long shot.
So it seems like xz has a considerable performance/resource impact here as well.
Yep, that's reasonable. E.g. on my machine, decompressing code compressed
with xz -2 reads the compressed data at ~13MB/s. If the part of the live CD
that needs to be read to boot to a graphical environment is on the
order of 1GB, just decompressing that is going to take more than a
minute of CPU.
Zbyszek