Abstract: A method, system and computer program product for detecting conditions of network instability. An attribute indicative of network instability, e.g., processor and/or co-processor utilization, packet arrival rates, packet peak rates, packet size distribution, packet clustering tendencies, buffer usage patterns, occurrence of peak utilization, out-of-buffer conditions, packet discard rates, may be monitored for a network device, e.g., router. The monitored attribute may be associated with a plurality of labels (variables) where a portion of those labels may be stored in a cache. A hit ratio for the cache storing labels associated with the monitored attribute may be tracked within a period of time based on the number of requested items, i.e., labels, that are currently stored in the cache. A condition of network instability may then be detected based on the hit ratio by determining if the absolute value of the acceleration of the hit ratio exceeds a threshold.

Abstract: The present invention provides an improved method and system for managing peripheral bus timeouts. The method includes: sending a request to a peripheral in a performance of a task; determining that a peripheral bus timeout occurred; sending an interrupt signal; retrying for an access to the peripheral; completing the request if the retry for the access to the peripheral is successful; and resuming the performance of the task. The present invention provides a software method in which an input/output (I/O) request to a peripheral is sent by a recoverable access routine. When a bus timeout occurs, a hung bus detector asserts an interrupt signal. The peripheral bus is freed from the hung condition. The recoverable access routine is suspended, and a bus timeout interrupt handler is then loaded. The interruption and the freeing of the peripheral bus frees the microprocessor from the processing of the I/O request so that other requests may be performed.

Abstract: A method, system and computer program product for detecting conditions of network instability. An attribute indicative of network instability, e.g., processor and/or co-processor utilization, packet arrival rates, packet peak rates, packet size distribution, packet clustering tendencies, buffer usage patterns, occurrence of peak utilization, out-of-buffer conditions, packet discard rates, may be monitored for a network device, e.g., router. The monitored attribute may be associated with a plurality of labels (variables) where a portion of those labels may be stored in a cache. A hit ratio for the cache storing labels associated with the monitored attribute may be tracked within a period of time based on the number of requested items, i.e., labels, that are currently stored in the cache. A condition of network instability may then be detected based on the hit ratio by determining if the absolute value of the acceleration of the hit ratio exceeds a threshold.