Built from source, can't get past "Using POSIX non-realtime" with Preempt_RT

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6 years 5 months ago #168019 by jhandel
Built from source, can't get past "Using POSIX non-realtime" with Preempt_RT was created by jhandel
Howdy,
I am working on getting a local build going (so far so good--ish) Everything builds, all 230 tests pass.. However when I run the latency test I keep seeing "Using POSIX non-realtime" despite having an RT kernel..

here are the details on the setup:
OS: lubuntu 19.10
Code:
uname -a Linux cnc-pc 5.6.10-rt5 #1 SMP PREEMPT_RT Sat May 16 14:17:03 CDT 2020 x86_64 x86_64 x86_64 GNU/Linux
Processor: J3455
Machine: AWOW mini PC with 6gb memory and 128gb SSD ( www.amazon.com/Computer-AWOW-AK34-Ethern...d=1589680391&sr=8-18 )

I have attached a histogram from running rt-tests package cyclictest... I am no expert but that seems to be showing some pretty real-time type latency (to be fare I am a touch confused about the second peak... but way better than the 1,000,000 + I get from the latency-test running in POSIX non-realtime

Any help would be great, thanks all!

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6 years 5 months ago #168020 by jhandel
Replied by jhandel on topic Built from source, can't get past "Using POSIX non-realtime" with Preempt_RT
Forgot to mention I was building the 2.8 branch..

Looks like a bug/choice on line 332 of uspace_common.h
Code:
uname(&u); crit1 = strcasestr (u.version, "PREEMPT RT") != 0;

PREEMPT_RT is actually the signature used..

Looks like it is fixed in 2.9... Any reason not to fix it in 2.8?

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