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Subjectjitterentropy: `jent_mod_init()` takes 17 ms
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Dear Linux folks,


By mistake I built `XFRM_ESP` into the Linux kernel, resulting in

CONFIG_CRYPTO_SEQIV=y
CONFIG_CRYPTO_ECHAINIV=y

and also the Jitterentropy RNG to be built in.

CRYPTO_JITTERENTROPY=y

So, on the Asus F2A85-M PRO starting Linux 4.10-rc3 with
`initcall_debug`, the init method is run unconditionally, and it takes
17.5 ms, which is over ten percent of the overall 900 ms the Linux
kernel needs until loading the init process.

[ 0.300544] calling jent_mod_init+0x0/0x2c @ 1
[ 0.318438] initcall jent_mod_init+0x0/0x2c returned 0 after
17471 usecs

Looking at the output of systemd-bootchart, it looks like, that this
indeed delayed the boot a little, as the other init methods seem to be
ordered after it.

I am now building it as a module, but am wondering if the time can be
reduced to below ten milliseconds.


Kind regards,

Paul

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