RT Latency Tuning

Autonomous Machines Jetson & Embedded Systems Jetson Orin NX
1

Hi all,
according to the Developer guide, there are some ‘Latency tuning’ parameters that can be set.
At the end of Kernel Customization — Jetson Linux Developer Guide documentation it says:

  1. RT Latency Tuning Apply these settings for Jetson AGX Xavier after RT kernel boot to get the best latency value.

echo 100 > /sys/kernel/debug/tegra_mce/rt_window_us
echo 20 > /sys/kernel/debug/tegra_mce/rt_fwd_progress_us
echo 0x7f > /sys/kernel/debug/tegra_mce/rt_safe_mask

I have some questions:

  1. The section seems part of a list ( 1. ) but no other parameters are suggested. Is it correct or something is missing?
  2. The RT Latency Tuning parameters above seems compatible with Jetson AGX Xavier only, but they have been recommended for NX Xavier also (here: The real-time performance of jetson xavier is very poor - #5 by sumitg). Are they also compatible with ORIN arch and all the other platforms listed in the section?
  3. Minor typo: I think there shall be a divider between RT Latency Tuning and Apply these...
3

Hi,

The section seems part of a list ( 1. ) but no other parameters are suggested. Is it correct or something is missing?

I think it’s complete, it’s just that the building system we use for document automatically adds the list variable, even though it has just one item. You’ll find similar situations in other sections.

The RT Latency Tuning parameters above seems compatible with Jetson AGX Xavier only, but they have been recommended for NX Xavier also (here: The real-time performance of jetson xavier is very poor - #5 by sumitg). Are they also compatible with ORIN arch and all the other platforms listed in the section?

I’ll check with our internal team and get back to you.

Minor typo: I think there shall be a divider between RT Latency Tuning and Apply these...

It does look like a typo, and we’ll fix it. Thanks.

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5

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6

Hi,

sorry that I forgot to reply.
This tuning is only available on Xavier series, but not on Orin.
The list just means RT kernels have been verified on these platforms.

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