Electrical computers and digital data processing systems: input/ – Intrasystem connection – Bus access regulation
Reexamination Certificate
2011-06-14
2011-06-14
Dang, Khnah (Department: 2111)
Electrical computers and digital data processing systems: input/
Intrasystem connection
Bus access regulation
C710S060000
Reexamination Certificate
active
07962677
ABSTRACT:
A method, programmed medium and system are provided in which system bus traffic is moderated with real-time data. The Operating System (OS) is enabled to get information from the firmware (FW) to determine if a resource threshold has been reached. This is accomplished by generating an interrupt to flag the OS when a bus request retry rate has reached a predetermined number. The system firmware plays an integral role in this mechanism, and should be interpreted as a general term which could also include a hypervisor technology. The system firmware will report the bus request retry rate to the operating system by way of, for example, a firmware-generated interrupt. The OS may have something similar to a kernel daemon/service running to intercept the interrupt notice. In the simplest case, the daemon/service will determine if the threshold has been met based on the feedback from the firmware. If so, it will generate a system call that will moderate traffic with an operating system tunable. In one example, the number of simultaneous multithreading (SMT) threads per core will be reduced using a system call. This effectively throttles back the amount of logical threads per core and effectively alleviates the bus request saturation.
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Flemming Diane Garza
Gholami Ghadir Robert
Herescu Octavian Florin
Maron William A.
Srinivas Mysore Sathyanarayana
Dang Khnah
International Business Machines - Corporation
Mims Jr. David A.
Wilder Robert V.
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