公开(公告)号：CA2303726C

公开(公告)日：2005-01-11

申请号：CA2303726

申请日：2000-04-05

Applicant: IBM

Inventor： WHITLEY LAWRENCE D ,  NEAL DANNY M ,  YANES ADALBERTO G ,  KELLY RICHARD A

IPC: G06F13/10 ,  G06F3/00 ,  G06F13/00 ,  G06F13/14 ,  G06F13/20 ,  G06F13/36 ,  G06F13/38 ,  G06F13/40

Abstract: Buffer management for improved PCI-X or PCI bridge performance. A system and method for managing transactions across a PCI-X or PCI bridge, and a system and method of waiting for, increasing, and/or optimizing the available buffers for transaction size or sizes across a PCI-X or PCI bridge. Transactions are processed across the bridge, and the bridge has buffers with actual available buffer space used for receiving and processing the transactions. Transaction size of the transaction is determined. The system and method sets an available free block which is a set amount of available buffer space that is to be freed up before certain larger size transactions are processed. The system and method waits for the actual available buffer space to free up to and reach the available free block. The certain larger size transactions are then processed when the actual available buffer space has reached the available free block. The processing of the transactio n involves accepting the transaction if the transaction size is not greater than the actual available buffer space, retrying the transaction for processing by the bridge when the transaction size is less than the available free block but greater than the actual available buffer space, retrying the transaction by the bridge when the transaction size isgreater than the available free block and greater than th e available buffer space until the available buffer space is greater than or equal to the available free block, and accepting the transaction and then disconnecting once the actual available buffers are filled or at an end of the transaction.

公开(公告)号：CA2303726A1

公开(公告)日：2000-11-18

申请号：CA2303726

申请日：2000-04-05

Applicant: IBM

Inventor： KELLY RICHARD A ,  NEAL DANNY M ,  WHITLEY LAWRENCE D ,  YANES ADALBERTO G

IPC: G06F13/10 ,  G06F3/00 ,  G06F13/00 ,  G06F13/14 ,  G06F13/20 ,  G06F13/36 ,  G06F13/38 ,  G06F13/40

Abstract: Buffer management for improved PCI-X or PCI bridge performance. A system and method for managing transactions across a PCI-X or PCI bridge, and a system and method of waiting for, increasing, and/or optimizing the available buffers for transaction size or sizes across a PCI-X or PCI bridge. Transactions are processed across the bridge, and the bridge has buffers with actual available buffer space used for receiving and processing the transactions. Transaction size of the transaction is determined. The system and method sets an available free block which is a set amount of available buffer space that is to be freed up before certain larger size transactions are processed. The system and method waits for the actual available buffer space to free up to and reach the available free block. The certain larger size transactions are then processed when the actual available buffer space has reached the available free block. The processing of the transaction involves accepting the transaction if the transaction size is not greater than the actual available buffer space, retrying the transaction for processing by the bridge when the transaction size is less than the available free block but greater than the actual available buffer space, retrying the transaction by the bridge when the transaction size is greater than the available free block and greater than the available buffer space until the available buffer space is greater than or equal to the available free block, and accepting the transaction and then disconnecting once the actual available buffers are filled or at an end of the transaction.

公开(公告)号：CA2302077A1

公开(公告)日：2000-11-18

申请号：CA2302077

申请日：2000-03-24

Applicant: IBM

Inventor： KELLY RICHARD A ,  YANES ADALBERTO G ,  NEAL DANNY N

IPC: G06F13/12 ,  G06F13/14 ,  G06F13/16 ,  G06F13/20 ,  G06F13/36 ,  G06F13/364 ,  G06F13/38 ,  G06F13/40

Abstract: A system and method for optimally processing split request transactions across a PCI-X bridge with a PCI-X bridge buffer. The split transaction mode of the PCI-X bridge buffer is toggled between a No Over-commit mode and an over-commit mode. Over-commitment of the buffer is inhibited when the split transaction mode is toggled to the No Over-commit mode and when the buffer is over committed by the bridge. At least some over-commitment of the buffer is allowed by the bridge when the split transaction mode is toggled to the over-commit mode and when the buffer is not over committed by the bridge. The over-commit mode may be an Overcommitment mode or a Flood mode. The Over-commitment mode allows some degree of over commitment of the buffer by the bridge while the Flood mode allows the bridge to forward all split request transactions regardless of size of the transactions or amount of available space in the buffer when the Over-commit mode is in a Flood mode. The split request transaction is controlled and forwarded based on the toggled split transaction mode. The system comprises at least a toggle switch and a control system. The split transaction mode is toggled to or maintained at a particular mode based on whether a retry or disconnect of the split completion transaction by the PCI-X bridge has or has not occurred and whether the buffer is or is not over committed.