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AECFXI
n00b
Joined: 28 Nov 2018
Posts: 34
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 Posted: Mon Dec 30, 2024 10:42 pm Post subject: Real-time kernel preemption and building nvidia-drivers |
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With little noticeable fanfare, after 20 odd years of Linux kernel development, we now have real-time kernel preemption as an available build option in linux-6.12.6-gentoo.
x11-drivers/nvidia-drivers is not built with support for real-time preemption at this time, however that doesn't mean that there are necessarily issues - just that it is not formally supported and I will not cry or file bug reports if I do run into problems on an Nvidia-drivers platform.
To test how the system performs regardless of support, an error while attempting to emerge nvidia-drivers explains the requirements for such a test drive:
| Quote: | * CONFIG_PREEMPT_RT: is set but is unsupported by NVIDIA upstream and
* will fail to build unless the env var IGNORE_PREEMPT_RT_PRESENCE=1 is
* set. Please do not report issues if run into e.g. kernel panics while
* ignoring this. |
I have made some very earnest attempts to work this environment variable into portage's configuration files, but I am just not figuring out how to inject such an environment variable into building nvidia-drivers.
Does it go in MAKEOPTS= ? As in, MAKEOPTS="${MAKEOPTS} --IGNORE_PREEMPT_RT_PRESENCE=1"? Because that breaks portage when the flag is directly put into make.conf's MAKEOPTS field and doesn't have an effect when I make a bespoke /etc/portage/env/* configuration file with that line and then call for nvidia-drivers to build with that env config in package.env |
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grknight
Retired Dev
Joined: 20 Feb 2015
Posts: 1968
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| Posted: Mon Dec 30, 2024 11:25 pm Post subject: |
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Not MAKEOPTS but its own line in a /etc/portage/env file.
E.g. /etc/portage/env/preempt-rt.conf: | Code: | | IGNORE_PREEMPT_RT_PRESENCE=1 |
If this is too late for detection, then consider a new file in /etc/env.d instead |
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Portage & Programming
