We have crappy BIOS and motherboard makers to blame for this. BIOS was
always a train-wreck of spaghetti assembly. Then Intel decided to write
an entire new OS from scratch to embed into every motherboard vs just
use (LinuxBIOS) coreboot or similar.

Same cpu, chipset and memory settings should have the same results. But
BIOS/UEFI variations that are broken don't actually kill things like
power management when the GUI says choose ON or OFF. OFF might not do
anything to it.

On 5/22/19 8:16 AM, andy pugh wrote:
> On Wed, 22 May 2019 at 13:58, John Thornton <[email protected]> wrote:
>
>> I'd say something is better than nothing so if we can produce a LiveDVD
>> with Debian 9 and preempt-rt and LinuxCNC Uspace we should.
>
> Well, that already exists (and I have a few machines installed from it)
> http://www.linuxcnc.org/testing-stretch-rtpreempt/
>
> On one of my machines that gives the best latency numbers I have ever seen
> (< 5k) but I have also heard that it is terrible on some other machines.
>
> There is even a documentation patch lined up to make the switch:
>  https://github.com/LinuxCNC/linuxcnc/pull/500/commits
>
> I think that could happen instantly, at the cost of not offering a working
> RTAI option.
>



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