Working on some DaVinci Resolve setups using Fedora 36
SuperMicro M12SWA-TF MOBO
Threadripper Pro 5975WX CPU
@felixthecat and I are trying to diagnose a problem with a USB DAC in DaVinci Resolve and popped in to have a look at how the PCIe lanes are being used.
I could move PCI 01:00.0 elsewhere to get it off the same host bridge as the nvme drives? Am I reading that correctly?
The two RTX 3090 GPUs are PCI 01:00.1 and 21:00.0.
TIA
Moved things around - I think this is better? GPUs are PCI 21 & 22 and appear to now have their own lanes.
Does anyone know what the numbers / attributes for the PCI lanes mean?
My question exactly - @wendell once explained it to me but not in that level of detail. Maybe he’s around counting sheep…
The datarate of a PCI link may be written (in GB/s) right below its drawn line (if the operating system and/or libraries are able to report that information). This datarate is the currently configured speed of the entire PCI link (sum of the bandwidth of all PCI lanes in that link). It may change during execution since some devices are able to slow their PCI links down when idle.
Source: lstopo(1) — hwloc — Debian experimental — Debian Manpages
I believe this is the correct explanation.
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