#fedora-coreos on 2022-07-13 — irc logs at libera.irclog.whitequark.org

2022-05-11 12:42 dustymabe changed the topic of #fedora-coreos to: Fedora CoreOS :: Find out more at https://getfedora.org/coreos/ :: Logs at https://libera.irclog.whitequark.org/fedora-coreos

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06:43 <hartan[m]> <koalillo> "yesterday I tried to boot FCOS..." <- I tried running FCOS on a Pi3 a while ago using that UEFI Firmware. I decided to change the boot order, run the UEFI from a USB Stick and have FCOS on the SD card. It detected the UEFI Firmware fine, but whatever I tried it never recognized any bootable OSes on the SD card...

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08:38 <stephan> have you heared of an issue the suddenly half of cores are "offline"

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08:48 <bgilbert> stephan: offline, or missing?

08:48 <bgilbert> and "suddenly" = after an OS update? at runtime?

08:50 <stephan> https://ibb.co/9vqdLMN

08:51 <stephan> switched from debian to coreOS, I don't know when it happended

08:52 <stephan> have not seen this on any other machine, but we don't have exactly the i7 CPU in any other machine

08:53 <bgilbert> stephan: probably it's because Fedora CoreOS enables CPU vulnerability mitigation by default

08:53 <stephan> Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (pretty normal, I guess)

08:53 <bgilbert> stephan: which allows the kernel to disable hyperthreading when needed to mitigate security issues

08:53 <stephan> bgilbert: I was thinking aobut that

08:54 <bgilbert> stephan: to test, try removing mitigations=auto,nosmt from the kernel command line

08:54 <stephan> thanks, will try

08:55 <stephan> google did not help in this case, maybe I should write an stackoverflow post, that the issue is findable

08:57 <bgilbert> stephan: we have https://docs.fedoraproject.org/en-US/fedora-coreos/kernel-args/#_example_disabling_all_cpu_vulnerability_mitigations

08:58 <bgilbert> stephan: but that page sorta presumes you already know what you're looking for

08:58 <bgilbert> stephan: pull requests to https://github.com/coreos/fedora-coreos-docs/ are welcome if you have an idea for improving the docs

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09:42 <stephan> In my special case we might decide to replace the server

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09:46 <stephan> it would be nice to add the "keywords" about "Off-line CPU(s)" (from lscpu) & "offline" via htop to that document, but I would write that below the "code" in the "Starting from June 2021, " paragraph

09:47 <stephan> would I pull request with that hints make sense for you?

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12:41 <dustymab1> stephan: maybe more appropriate to add an entry to our FAQ?

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14:08 <dustymabe> jlebon: can I get you to do a looksie on https://github.com/coreos/coreos-assembler/pull/2919 ?

14:09 <jlebon> dustymabe: did you mean another PR? I stamped that one already :)

14:12 <dustymabe> jlebon: ha. I missed that

14:14 <walters> I asked for a bit more here https://github.com/coreos/coreos-assembler/pull/2919#issuecomment-1182084786 but so far didn't get that

14:16 <dustymabe> added my review

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15:33 <stephan> dustymabe: faq sound about right, as long es it can be found with google, it will help others

15:37 <dustymabe> 👍

15:37 <dustymabe> can you open a PR to our FAQ?

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16:03 <dustymabe> jlebon: travier[m]: either of you want to run the meeting today?

16:04 <dustymabe> or anyone else?

16:10 <jlebon> maybe lucab since it's been a while I think :)

16:10 <jlebon> otherwise, I can do it

16:12 <lucab> sorry, I plan to be around, but I'll also have some interruptions as I'm waiting for people at home

16:13 <travier[m]> I can't run it today sorry, as I will be interrupted too

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16:28 <jlebon> np, I'll do it

16:30 <jlebon> aaradhak davdunc dustymabe gurssing jaimelm jbrooks jcajka jdoss jlebon jmarrero lorbus miabbott nasirhm ravanelli saqali skunkerk walters

16:30 <jlebon> FCOS community meeting in #fedora-meeting-1

16:30 <jlebon> If you don't want to be pinged remove your name from this file: https://github.com/coreos/fedora-coreos-tracker/blob/main/meeting-people.txt

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17:49 <bgilbert> I think switching loglevels at end of boot is worth considering fwiw

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17:56 <jlebon> we could also only do it if someone logs into the serial console

17:57 <jlebon> /etc/profile.d dropin would've worked, but only if it's root logging in I think

18:00 <bgilbert> jlebon: that doesn't address the "my console logs are too large" problem though

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20:24 <dustymabe> jlebon: finally got this polished off https://github.com/coreos/coreos-assembler/pull/2979

20:24 <dustymabe> now I'm going to set up the staging pipeline to use it

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20:31 <jlebon> dustymabe: sweet!

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