PCI-e's IB heritage is present in every aspect of the standard, it's electrically the same, signalling and encoding are the same etc.
In the early days of all this there was a few competing standards that all had the same underlying architecture, serial, 8b/10b encoding, etc. The 2 big ones were NGIO and FutureIO. These two were eventually merged and was called ServerIO before being renamed to Infiniband.
Infiniband was going to be the next big thing and a few companies set out to make the silicon, Mellanox, QLogic/Silverstorm, Topspin/Cisco among the main ones.
Sun and Microsoft both committed to building the drivers to make this work. However pretty soon MS ran into issues with their drivers and eventually pulled the plug on shipping IB drivers in NT. This caused Cisco to drop IB and eventually doomed IB in the enterprise datacenter space and settled for Ethernet.
Sun pretty much followed suit for standard enterprise data centers but kept working on IB drivers and IB switches for their HPC and storage units. You can still see it kicking around in stuff like Exadata.
Intel is mainly responsible for making PCI-e happen. They had proposed one of the initial standards that became IB, NGIO. When NGIO was fused with FutureIO to create IB the same group renamed it to Arapahoe which was later renamed 3GIO before being renamed to PCI-e when standardized by the PCI SIG. Design wise little changed it just eschewed some of the switching complexity and focused on being an internal system interconnect.
So in many ways it's not quite PCI-e is descendant from IB but rather PCI-e -is- IB lol.
In the early days of all this there was a few competing standards that all had the same underlying architecture, serial, 8b/10b encoding, etc. The 2 big ones were NGIO and FutureIO. These two were eventually merged and was called ServerIO before being renamed to Infiniband.
Infiniband was going to be the next big thing and a few companies set out to make the silicon, Mellanox, QLogic/Silverstorm, Topspin/Cisco among the main ones.
Sun and Microsoft both committed to building the drivers to make this work. However pretty soon MS ran into issues with their drivers and eventually pulled the plug on shipping IB drivers in NT. This caused Cisco to drop IB and eventually doomed IB in the enterprise datacenter space and settled for Ethernet.
Sun pretty much followed suit for standard enterprise data centers but kept working on IB drivers and IB switches for their HPC and storage units. You can still see it kicking around in stuff like Exadata.
Intel is mainly responsible for making PCI-e happen. They had proposed one of the initial standards that became IB, NGIO. When NGIO was fused with FutureIO to create IB the same group renamed it to Arapahoe which was later renamed 3GIO before being renamed to PCI-e when standardized by the PCI SIG. Design wise little changed it just eschewed some of the switching complexity and focused on being an internal system interconnect.
So in many ways it's not quite PCI-e is descendant from IB but rather PCI-e -is- IB lol.