Comment 15 for bug 1858495

I added initcall debug and got some more data:

The first delay:

# [ 2.846188] localhost.localdomain kernel: AES CTR mode by8 optimization enabled
# [ 5.919313] localhost.localdomain kernel: raid6: avx2x4 gen() 21512 MB/s

There are some silent initializations occuring between these two points, mainly crypto code such as ghash, crc32, ccrt10dif, raid0, raid, libcrc32c etc. A fairly long pause of ~600ms occurs during the hv_netvsc initialization, this is the Hyper-V network driver, so that's expected to have some time variation and is dependant on the host.

The second delay:

# [ 5.159028] localhost.localdomain kernel: EXT4-fs (sda1): mounted filesystem with ordered data mode. Opts: (null)
# [ 8.385284] localhost.localdomain systemd[1]: systemd 237 running in..

I can't seem to seem to reproduce the long delay, I'm seeing ~100-250ms delays between the invocation of the mount and the mount completion. I wonder if this is still a H/W issue where my VMs are different machines and performing faster. Anyhow, with the debug enabled I believe there is little going on between these two points apart from an ext4 mount.