Only 4 cores out of 6 are available on Pegasus


There are only 4 cores out of 6 available on our DRIVE AGX Pegasus. I have noticed it, when running cmake build tasks.

When I run the following command:

$ stress --cpu 6

tegrastats reports only 4 cores 100% loading, while the other 2 cores are 0%. htop reports the same.

Is it an expected behavior?

Our Pegasus was flashed with DRIVE Software 10.

Best regards,

Dear itriA30220,
We will check internally on this topic and update you.

Hi SivaRamaKrishna,

I’ve noticed that just after booting, all 6 core are available for full loading. But after a minute or two, 2 cores get to the idle.

Disabling the rr-launch service seems to be resolving the issue:

systemctl disable rr-launch.timer

Best regards,


It is because RoadRunner program modifies cgroups to move all the current and future processes/threads to CPUs 0-2,5. And then it runs its own programs on CPUs 3 and 4.