Abstract: Examples include a first computer system operating in lockstep with a second computer system. The first computer system includes a first signature generator to generate a first digital signature representing a first write operation by a first memory controller to a first memory, the first write operation to store data at an address in the first memory, and a first signature register to store the first digital signature. The second computer system includes a second signature generator to generate a second digital signature representing a second write operation by a second memory controller to a second memory, the second write operation to store the data at the address in the second memory, and a second signature register to store the second digital signature. The first digital signature is compared to the second digital signature and a lockstep error is detected when the first digital signature does not match the second digital signature.

Abstract: The disclosure describes a system including a first computer system including a first memory controller and a first inter-computer transfer interface to send information about write operations over an interconnect to a second computer system. A second computer system includes a second memory controller and a second inter-computer transfer interface to receive the information about the write operations over an interconnect, wherein the write operations are duplicated through the second memory controller. In other embodiments, a system includes a first computer system including a first memory controller and a first inter-computer transfer interface to send information about write operations of the first computer system during a lockstep operation. Still other embodiments are described.

Abstract: The disclosure describes a system including a first computer system including a first memory controller and a first inter-computer transfer interface to send information about write operations over an interconnect to a second computer system. A second computer system includes a second memory controller and a second inter-computer transfer interface to receive the information about the write operations over an interconnect, wherein the write operations are duplicated through the second memory controller. In other embodiments, a system includes a first computer system including a first memory controller and a first inter-computer transfer interface to send information about write operations of the first computer system during a lockstep operation. Still other embodiments are described.