Upgrading intel/compute-runtime from 26.05.37020.3 to 26.14.37833.4 breaks PCIe maxBandwidth reading

[ProjectPhysX]

Hi @joshuaranjan,

updating intel/compute-runtime from 26.05.37020.3 to latest 26.14.37833.4 breaks zes_pci_properties_t on Intel Arc B580.

Now all 3 ways to get the maximum PCIe bandwidth are broken on Linux:

• ❌ zes_pci_stats_t::speed.gen/maxBandwidth/width return -1
• ❌ zes_pci_state_t::speed.gen/maxBandwidth/width return -1
• ❌ zes_pci_properties_t return -1

With the older version zes_pci_properties_t was still working.

My system configuration is

• Ubuntu 24.04.4 LTS
• kernel 6.17.0-22-generic

For testing, you may use https://github.com/ProjectPhysX/hw-smi

Kind regards,
Moritz

[joshuaranjan]

Hi @ProjectPhysX ,

Will check this

[ProjectPhysX]

Rootcause is different than I originally thought:

• zes_pci_properties_t still works as intended.
• But zes_pci_state_t::speed.maxBandwidth now returns a wrong, non-zero value of 64. It is supposed to return The maximum bandwidth in bytes/sec (sum of all lanes). When dividing by 1000000 to get value in MB/s, result is 0 and my fallback to zes_pci_properties_t.maxSpeed.maxBandwidth was not activated anymore.

Kind regards,
Moritz