[systemd-devel] startup performance

[Allmeroth, Robert]

Hello,

While playing around with systemd and our automotive setup we found that systemd checks some kernel features at startup (from systemd 33).
static const char * const kmod_table[] = {
        "autofs4", "/sys/class/misc/autofs",
        "ipv6",    "/sys/module/ipv6",
        "unix",    "/proc/net/unix"
};
If they are not available - they are modprobed.

The problem is that any modprobe takes ~1 second, which kills our startup.
If we compile these features into the kernel, the kernel boot time increases.

Question(s):
Are these kernel features really needed in the early startup phase?
I agree to 'unix' but in an automotive environment  'ipv6' and 'autofs4' are typically needed at a later point in the startup (or not needed at all).

Is it possible to provide them as unit files so that they can be loaded if really needed?

Best regards
  Robert



ROBERT ALLMEROTH
Harman Automotive Division

Becker-Göring-Straße 16
76307 Karlsbad
Phone: +49 (0) 7248-71-1156
Fax: +49 (0) 7248-71-2156
Email: Robert.Allmeroth at harman.com
Web: www.harman.com



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