On Thursday 26 December 2019 15:23:11 Dr. Nikolaus Klepp wrote:
Anno domini 2019 Thu, 26 Dec 15:08:41 -0500
Gene Heskett scripsit:
On Thursday 26 December 2019 10:30:39 Michael wrote:
On Thursday 26 December 2019 05:24:06 am Gene Heskett wrote:
preempt-realtime kernel
Hi Gene,
You've mentioned realtime kernel before as being faster(/better?), do you have a goto link/article that explains it for a mostly uninformed about kernel person?
If you install the kernel src debs, you can do a make menuconfig, which will allow you access to the kernels fine tuning, and one of the option buried in the menu's is to turn on a config option call preempt-rt or preempt-realtime. This changes the IRQ handling to make the IRQ's be handled much quicker at the expense of making other stuff wait a few microseconds.
One should also mention, that for a normal user a realtime kernel is a bad idea, the GUI will not perform better.
That is highly dependant on the kernel. At the present time, the version I built is about 25 fps faster than the raspbian kernel it replaces. And even that is an older build.
There are other, even better ways to do this but this one disturbs the rest of the system less, and it puts those operations in the users workspace. All other methods become a portion of the kernel wom
I can search this, but with the amount of bias/wrong/propaganda you end up with now from google searches, I figured I’d ask someone who actually knows…
The confusion reigns heavily because the rt developer group is actually 2 or 3 parallel projects. All of which are working on getting the version of the code they are working on good enough to become the core the default build is based on. I am not an expert, I simply git clone a version and if it works we've a winner, if not, tag a newer one and try again. Development is moving at breakneck speeds
And then there is RTAI, which gives a latrency of ~ 1/5th to 1/10th of RT-PREEMPT. But it does not work on ARM :(
Its my understanding that it is being worked on. But I've been in the shop getting my ticker rebuilt too, and this computer had a fire and had to be rebuilt with a new mobo, cpu and memory, which occupied my time between visits to the cath-lab, so I'm not exactly uptodate on that. Couple months out of date, or more, I had the heart attack in late Sept. Theoreticly fixed now, and I feel better than a year ago. So you, Nik, are likely quite a bit closer to current than I. Please fill these folks in where I blew it.
Nik
Thanks, Michael
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Cheers, Gene Heskett
Cheers, Gene Heskett