Transcription of Understanding the Performance Implications of Buffer to ...
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Understanding the Performance Implications of Buffer to Buffer Credit Starvation In a FICON Environment: Frame Pacing DelayPaper 7080 Steve GuendertPrincipal EngineerCMG 2007 International ConferenceDecember, 2007 Understanding the Performance Implications of Buffer to Buffer Credit Starvation: Frame Pacing 2007 CMG 2007 Steve Guendert 2007 Brocade Communications Systems, Inc. All rights reserved. 2 AbstractyThis paper will give a brief review on Buffer -to- Buffer credits (BB_credits) including current schema for allocating/assigning them. It will then discuss the one method currently available to detect BB_credit starvation on FICON directors, including a discussion on the concept of frame pacing delay. Finally, the author will outline a concept for a mechanism to count BB_creditusage. The paper will conclude with a discussion of another theoretical drawing board concept: dynamic allocation of BB_credits on an individual I/O basis similar to the new HyperPAVs concept for the Performance Implications of Buffer to Buffer Credit Starvation: Frame Pacing 2007 CMG 2007 Steve Guendert 2007 Brocade Communications Systems, Inc.
Understanding the Performance Implications of Buffer to Buffer Credit Starvation In a FICON Environment: Frame Pacing Delay Paper 7080 Steve Guendert
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