International Business Machines Corporation

Nikhil Hedge

Bruce Gerard Mealey

Mark D Rogers

Aruna Yedavilli

Kavitha Vittal Murthy Baratakke

Rashmi Narashimhan

A method for zeroing memory in computing systems where access to memory is non-uniform includes receiving, via a system call, a request for a pool of memory, determining a size of the requested pool of memory, and creating a dummy memory segment. The size of the dummy memory segment is larger than the size of the requested pool of memory. The dummy memory segment is filled with one or more pages, based on the determined size of the requested pool of memory, and the dummy memory segment is deleted.

Affinity-aware parallel zeroing of memory for initialization of large pages in non-uniform memory access (NUMA) servers

A method for zeroing memory in computing systems where access to memory is non-uniform includes receiving, via a system call, a request to delete a memory region. The method also includes sorting, after receiving the request, one or more pages of the memory region according to each associated affinity domain of each page. The method further includes sending requests to zero the sorted one or more pages to one or more zeroing threads that are attached to the respective affinity domain. The method further yet includes waiting, after sending the requests, to return to the system caller until a message is received, from the zeroing threads in each affinity domain, indicating that all the page zeroing requests have been processed.

Affinity-aware parallel zeroing of memory in non-uniform memory access (NUMA) servers

A method for zeroing memory in computing systems where access to memory is non-uniform includes receiving, via a system call, a request for a pool of memory. The method also includes determining a size of the requested pool of memory, and creating a dummy memory segment. The size of the dummy memory segment is larger than the size of the requested pool of memory. The method further includes filling the dummy memory segment with one or more pages, based on the determined size of the requested pool of memory, and deleting the dummy memory segment.

A method for detecting and reducing packet drops in a communications system may include receiving a first packet having a sequence number, determining if a second packet having a sequence number immediately preceding the sequence number of the first packet is lost, and/or determining if a third packet having a sequence number immediately preceding the sequence number of the second packet is lost. A counter may be incremented if the second and third packets are determined as lost. An amount of time required before detecting link activity after an end of a previous frame may be reduced if the counter violates the count threshold and the amount of time has not been previously reduced. A lower link speed may be negotiated if a current link speed is above a negotiable threshold and the amount of time required before detecting link activity has been previously reduced.

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Nikhil Hedge