I am a machinist, not a Linux nerd. Please help me.
06 Apr 2020 22:46 #162976
by andypugh
Replied by andypugh on topic I am a machinist, not a Linux nerd. Please help me.
What's your latency like? There was a comment from the LinuxCNC RTAI dude recently that UEFI is generally bad for latency, which is why preempt-rt makes you do the grub command line "no, really, I want to do this". They could have made that a default and chose not to.
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07 Apr 2020 00:30 #162988
by BeagleBrainz
Replied by BeagleBrainz on topic I am a machinist, not a Linux nerd. Please help me.
Talking about RT_PREEMPT.
With regards to the extra grub commandline, I didn't see much of a difference with latency, if any, the only reason I had to search that out was to mount the efivars filesystem otherwise when installing, grub will fail. Once installed you can omit the "efi-runtime" and everything is fine. You just wont be able to manipulate the efi boot manager from with Linux.
But it may require further testing. Once all installed one only need to boot via grub with "efi=runtime" and put it through it's paces, and again without "efi=runtime" and put it through it's paces.
With regards to the extra grub commandline, I didn't see much of a difference with latency, if any, the only reason I had to search that out was to mount the efivars filesystem otherwise when installing, grub will fail. Once installed you can omit the "efi-runtime" and everything is fine. You just wont be able to manipulate the efi boot manager from with Linux.
But it may require further testing. Once all installed one only need to boot via grub with "efi=runtime" and put it through it's paces, and again without "efi=runtime" and put it through it's paces.
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