Re: Decreasing time for `rsa_init`

Dear Stephan,


Am Mittwoch, den 12.07.2017, 19:38 +0200 schrieb Paul Menzel:

On 07/12/17 19:28, Stephan Müller wrote:

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Am Mittwoch, 12. Juli 2017, 12:59:58 CEST schrieb Paul Menzel:

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Building CRYPTO_RSA not as module, but into the Linux kernel,
`rsa_init()` takes 130 ms on an ASRock E350M1.

(Timings are shown by adding `initcall_debug` to Linux command
line [1].
The times are visualized by `analyze_boot.py` from pm-graph [2]
or `systemd-bootchart`.)

This is quite a lot of time compared to other modules, and I
wonder if
there are ways to decrease that time other than building it as a
module,
and not signing modules?

Is the testmgr compiled? If yes, the self test may take that time.

It looks like it is, as the tests are not disabled.

$ grep MANAGER_DISABLE_TESTS .config
# CONFIG_CRYPTO_MANAGER_DISABLE_TESTS is not set

I’ll try an image without the tests, and will report back.

Thank you. That was it. Disabling the tests reduces the time to 51 μs.

kernel: calling  rsa_init+0x0/0x40 @ 1
kernel: initcall rsa_init+0x0/0x40 returned 0 after 51 usecs

It’d be nice to be able to disable the testmgr during run-time by
adding an option to the Linux Kernel command line for example.


Kind regards,

Paul

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[1] http://elinux.org/Initcall_Debug
[2] https://github.com/01org/pm-graph