TCP/IP, HiperSockets, and RoCE are not three equivalent network protocols. TCP/IP is a protocol suite; HiperSockets is an internal communication path between eligible partitions on the same IBM Z system; and RoCE carries RDMA traffic over Ethernet. For external Ethernet LAN connectivity, OSA-Express is another option. The right choice depends on where traffic must go, what the workload needs, and whether the exact system and software configuration support the path.
What is the difference between TCP/IP, HiperSockets, and RoCE?
The key distinction is between a protocol stack and the paths or mechanisms that carry traffic. TCP/IP defines how IP communication works; it does not, by itself, identify a physical adapter or one particular IBM Z connection. HiperSockets and RoCE describe different ways traffic can move. TCP/IP can use HiperSockets, while RoCE can support TCP/IP and, in eligible configurations, Shared Memory Communications over RDMA (SMC-R).
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| Option | What it is | Typical role | Important constraint |
|---|---|---|---|
| TCP/IP | A protocol suite and software stack | IP communication over a supported interface | It is not itself an adapter or a direct alternative to a path such as HiperSockets or RoCE. IBM’s z/OS HiperSockets concepts and IBM Z network-adapter documentation describe these as distinct layers. |
| HiperSockets | An internal IBM Z hardware networking feature | Communication among participating partitions within the same central processor complex (CPC) | Its scope is internal to the system; external connectivity requires another path or a supported converged arrangement. (IBM z/OS 3.2 documentation) |
| OSA-Express with TCP/IP | An Ethernet adapter used for IP networking | Connecting IBM Z partitions to an Ethernet LAN and external networks | Adapter support depends on the system configuration. OSA’s Ethernet/IP role is different from RoCE’s RDMA role. (IBM system hardware documentation) |
| RoCE / RoCE Express | Remote Direct Memory Access (RDMA) over Converged Ethernet | Supported data movement or SMC-R communication where low latency or reduced processor involvement is valuable | Requires compatible hardware, network mapping, and software configuration; availability is model- and configuration-specific. (IBM Solution Assurance, May 2022; IBM z/OS 3.2 documentation) |
IBM describes HiperSockets as a high-performance way to communicate between LPARs in the same CPC without additional external hardware such as channel adapters or LANs. That makes it a candidate for internal traffic, not a replacement for an external LAN connection.
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When should you use HiperSockets?
Evaluate HiperSockets when the communicating workloads are on eligible partitions on the same IBM Z system and their traffic can remain inside that system. Because the path does not traverse external network equipment, it avoids relying on an external adapter and cabling for that internal exchange.
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- Confirm that the intended partitions can participate in the HiperSockets configuration and that the needed channel and network interface are configured.
- Plan how internal traffic is separated and managed alongside other network traffic; the fact that a path is internal does not by itself define your network design.
- If those workloads also need access beyond the system, plan a separate external route or a supported arrangement that combines internal and external connectivity.
For virtualized environments, IBM documents options including a z/VM VSWITCH using OSA or a HiperSockets Bridge, and KVM MacVTap or Linux bridging arrangements. The appropriate design depends on the hypervisor and topology rather than on the label “HiperSockets” alone.
When should you use OSA-Express or RoCE?
Choose OSA-Express for conventional Ethernet LAN connectivity
OSA-Express provides Ethernet connectivity for IP traffic to a LAN and potentially to external networks. Consider it when the requirement is to connect a partition to an Ethernet network using a conventional IP path. Check adapter compatibility and the intended Ethernet topology against the planning information for the system in question.
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Evaluate RoCE for supported RDMA workloads
RoCE uses Ethernet to carry RDMA communication. IBM describes potential benefits such as lower latency and reduced processor involvement in supported workloads, including SMC-R scenarios. Those are workload- and configuration-dependent advantages, not a guarantee that every application using Ethernet or TCP/IP will become faster when RoCE hardware is present.
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Before choosing RoCE, verify that the required adapter is supported, that the physical network identifiers and adapter associations are set up correctly, and that the operating system or hypervisor supports the intended use. IBM’s physical-network guidance and PCIe RoCE configuration material are relevant to those checks.
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How do you choose among the options?
- Define the traffic scope. If communication stays between participating partitions in one system, assess HiperSockets. If it must reach an Ethernet LAN or another external network, assess OSA-Express or a supported RoCE-capable design.
- Identify the workload requirement. For ordinary IP connectivity, start with the supported TCP/IP path. For eligible latency-sensitive or high-volume communication where processor use matters, assess RoCE or SMC-R as a possible fit.
- Check the whole configuration. Verify the system model, adapter, operating system, hypervisor, network topology, and required interface settings together. Support for a technology name alone does not establish support for a particular combination.
- Measure the target workload. Compare latency, throughput, processor consumption, workload type, and number of parallel connections under the conditions you expect to run. IBM’s performance-comparison material identifies these as useful dimensions, but does not establish a universal winner.
IBM also documents HiperSockets Converged Interfaces (HSCI), which can combine a HiperSockets network interface with an external OSA or RoCE port. IBM says HSCI is available starting with z15 or LinuxONE III; confirm operating-system support and the intended topology before relying on it.
What should you know about IBM Z and RoCE compatibility?
IBM’s documentation makes configuration-specific statements that should not be collapsed into a blanket rule. Its IBM Z network-adapter page says RoCE is not supported on IBM z17 in the context covered by that page. Separately, IBM’s z/VM 7.3 PCIe documentation describes Network Express adapters (10GbE and 25GbE) configured as NETH devices on z17 as providing RoCE functionality supported on prior IBM Z family servers. These statements concern different documented contexts and hardware configurations.
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Therefore, neither statement establishes a universal answer for every z17 installation. Confirm the exact system, adapter, adapter configuration, hypervisor, and operating system in current IBM system-planning and product documentation before selecting or deploying RoCE.
Is one option faster than the others?
There is no substantiated universal ranking in the cited IBM material. HiperSockets avoids an external network path for eligible same-system traffic; RoCE may reduce latency or processor involvement for supported workloads; and OSA-Express supplies Ethernet LAN connectivity. Those differences describe where each option fits, not a benchmark result applicable to every application.
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For a meaningful comparison, measure the actual workload and configuration. Include latency, throughput, processor consumption, and parallel-connection count, and compare like-for-like conditions. A performance result from one workload or adapter setup should not be generalized to a different IBM Z system or traffic pattern.
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