"Virtual Switches" PCIe Switches on PXIe-1092 and PXIe-1095

[rossqsmith]

The single PXIe switch in the PXIe-1092 backplane features two "PCIe virtual switches" that provide additional PCI resources so that demanding PXIe peripherals placed in Virtual Switch 1 and Virtual Switch. I ask because RADX makes PXIe-GPUs and our most advanced PXIe-GPUs demand quite a bit of PCI resources, so we have to locate them in separate Virtual Switches on the PXIe-1092.

Does anyone know if the PCIe Switches in the PXIe-1095 are similar, i.e., they also support PCIe Virtual Switches? If so, any thoughts on which PXIe-1095 slots are connected to which PCIe Virtual Switches?

Thanks,

Ross Smith

RADX Technologies, Inc.

[alynch]

The virtual switch concept relevant to the 1092 because it has one big switch partitioned into two virtual switches each connected to a separate link on the controller slot. In the 1095, there are two physical switches connected to the separate links as shown in the backplane diagram in the user manual[1]. You can see which peripheral slots are connected to which switch there. Virtual switches would not help further with your situation since the links are already split between the physical switches.

As a side note, PCIe resources rarely depend on which switch (and therefore controller slot port) a module is connected to. It is relevant on the PXIe-8881 controller which has separate root ports for each link, but controllers like the PXIe-8861 with an onboard PCIe switch will combine everything to a single link to the CPU and controllers like the PXIe-8862 have both links connected to the same root port so it won't make a difference.

[1] https://www.ni.com/docs/en-US/bundle/pxie-1095-features/page/hybrid-peripheral-slots.html