Slow boot on Debian stretch

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Paulo Sherring

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Sep 30, 2018, 12:43:44 PM9/30/18
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Hi all! I am trying to get a machinekit image optimized for the least boot time I can.
After that, I install git, pull newer kernel update scripts and install ti-rt 4.14 kernel, with the options  --ti-rt-channel --lts-4_14
After doing it, the boot time goes from 80 seconds - high enough already - to 220+ seconds.

dmesg output after updating: https://pastebin.com/U8cMQy32

Thanks in advance!
Paulo Sherring.

Robert Nelson

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Sep 30, 2018, 1:27:15 PM9/30/18
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Correct, "rt" in v4.14.x is slow..

i was able to very the first 250 or so patches in the RT patchset do
not cause the slowdown..

However the remaining 250 or patches are not bisectable..

on a side note, i haven't seen the slow down with v4.18.x + rt..

Regards,

--
Robert Nelson
https://rcn-ee.com/

Paulo Sherring

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Sep 30, 2018, 4:23:28 PM9/30/18
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Great! Is 4.18 + rt available through update_kernel.sh script? I saw that 4_19 was available, but when trying to pass it as argument, it was not recognized. I am just now testing 4.9 rt to see how it does it boot.

Robert Nelson

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Sep 30, 2018, 7:57:06 PM9/30/18
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On Sun, Sep 30, 2018 at 3:23 PM Paulo Sherring <pauloas...@gmail.com> wrote:
>
> Great! Is 4.18 + rt available through update_kernel.sh script? I saw that 4_19 was available, but when trying to pass it as argument, it was not recognized. I am just now testing 4.9 rt to see how it does it boot.

Use this option:

--bone-rt-channel --stable

to get:

ABI:1 STABLE 4.18.10-bone-rt-r10
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