IBM's Next-Gen Mainframe Chip: Running Arm and Z Workloads on the Same Cores
IBM is announcing today at the annual Hot Chips conference what may be the most significant change to mainframe architecture in decades: a processor capable of natively executing both IBM's own instruction set and Arm's — switching between the two in nanoseconds.
This chip will power the next generation of IBM Z and LinuxONE systems, marking the first dual-architecture mainframe processor ever built. It allows enterprises to run Arm-native Linux software, including AI frameworks, alongside z/OS transaction-processing workloads used by banks, insurers, and governments.
"As technology enthusiasts on both sides, we're really excited about being what I would consider one of the most powerful commercially available processors that'll be dual architecture," said Tina Tarquinio, chief product officer for IBM Z and LinuxONE.
The Announcement:
This marks the first hardware milestone from IBM and Arm's strategic collaboration unveiled in April, directly addressing the question of whether the mainframe can remain relevant in an AI era built largely on other silicon.
Engineering Marvel:
Instead of adding standalone Arm cores, IBM designed every core on the chip to be bilingual.
"On this chip are 11 cores, and each core can dynamically switch back and forth between Arm software mode and traditional Z software mode," explained Jacobi. "That enables us to run mission-critical enterprise software right next to the much broader software ecosystem of Arm applications."
This mechanism uses the open-source KVM hypervisor, allowing Arm64 Linux virtual machines and Linux on Z virtual machines to run side by side with virtually no performance overhead.
Key Features:
- 2-nanometer process node
- 11 cores, each bilingual
- Integrates traditional z/OS workloads with Arm-native software
- Maintains reliability guarantees and shared resources