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nosmt [KNL,MIPS,PPC,S390,EARLY] Disable symmetric multithreading (SMT).
Equivalent to smt=1.
[KNL,X86,PPC] Disable symmetric multithreading (SMT).
nosmt=force: Force disable SMT, cannot be undone
via the sysfs control file.
Yes I did try that as well, it didn't work ( but the value was passed correctly to the kernel command line ). I did expect that to work, so was a bit puzzled. I also tried smt=1, which is another alternative.
I did succeed turning off SMT via sysfs, so the problem I'm reporting here is not that I can't turn SMT off, but more that Bottlerocket doesn't seem to understand the concept of the old-school single arg kernel options.
( and separately I'm cuing up a PR for the K8s reserved-cpus as per our email chain )
Thanks for the confirmation @james-masson. I agree with your evaluation, it does look like the currently logic implicitly expects a key-value pair so I was hoping to find a pair that works which is faster than figuring out how we have the single line options. We have similar issues with order: #3647 but these are slightly different things.
You might also be able to do this with a bootstrap container until we sort out single value command line arguments.
Image I'm using:
bottlerocket-aws-k8s-1.29-x86_64-v1.19.4
What I expected to happen:
I want to turn off SMT in the kernel via
settings.boot.kernel-parameters
This is not a key-value pair.
What actually happened:
The config does not seem to accept anything other than
key = value
, and there are many kernel config options that are onlykey
.The system goes into a reboot loop if I leave an empty value array.
How to reproduce the problem:
Use one or other of the options below.
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