公开(公告)号：JP2007287140A

公开(公告)日：2007-11-01

申请号：JP2007098505

申请日：2007-04-04

Applicant: Internatl Business Mach Corp ,  インターナショナル・ビジネス・マシーンズ・コーポレーションInternational Business Maschines Corporation

Inventor： THURBER STEVE MARK ,  CARL ALFRED BENDER ,  ADARUBERUTO GIRERUMO YANESU ,  PATRICK ALLEN BATSUKURANDO

IPC: G06F13/28

CPC classification number: G06F13/28 ,  G06F12/1081

Abstract: PROBLEM TO BE SOLVED: To provide a mechanism for temporarily stopping DMA operation selected in a physical I/O adapter in order to allow data to migrate between physical pages which receive accesses by the physical I/O adapter.
SOLUTION: When receiving a request for DMA to the physical page in a system memory from the I/O adapter, migration in progress display (MIP) bit in a transformation control entry (TCE) pointing to the physical page is examined. The MIP bit expresses whether or not migration to other locations in the system memory with respect to the physical page referred to in the TCE is in process. When the MIP bit expresses that the migration of the physical page is in progress, DMA from the I/O adapter is temporarily stopped, whereas other DMA operation to other physical pages in the system memory from other I/O adapters are permitted to continue.
COPYRIGHT: (C)2008,JPO&INPIT

Abstract translation: 要解决的问题：提供一种临时停止在物理I / O适配器中选择的DMA操作的机制，以便允许数据在物理I / O适配器接收的物理页之间迁移。 解决方案：当从I / O适配器接收到系统内存中的物理页面的DMA请求时，将检查指向物理页面的转换控制条目（TCE）中的迁移进度显示（MIP）位。 MIP位表示是否正在处理相对于TCE中引用的物理页面迁移到系统存储器中的其他位置。 当MIP位表示物理页面的迁移正在进行时，来自I / O适配器的DMA暂时停止，而允许来自其他I / O适配器的系统内存中的其他物理页面的其他DMA操作可以继续。 版权所有（C）2008，JPO＆INPIT

公开(公告)号：JP2000357154A

公开(公告)日：2000-12-26

申请号：JP2000145980

申请日：2000-05-18

Applicant: IBM

Inventor： RICHARD ALLEN KELLY ,  DAY MARVIN NEIL ,  LAURENCE DEAN WHITELEY ,  ADARUBERUTO GIRERUMO YANESU

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

Abstract: PROBLEM TO BE SOLVED: To provide a buffer management technology for improving PCI (peripheral component interconnect)-X or PCI bridge performance. SOLUTION: A usable free block is set before a transaction is processed. A usable actual buffer space is expected to be released to reach the usable free block. When the transaction side is not larger than the usable actual buffer space, the transaction is accepted and when the transaction size is smaller than the usable free block, but larger than the usable actual buffer space, the transaction is retried; when the transaction size is larger than the usable free block and also larger than the usable buffer space, the transaction is accepted until the usable buffer space becomes larger than the usable free block.