487 results about "Host memory" patented technology

A method of performing a translation from a guest virtual address to a host physical address in a virtual machine environment includes receiving a guest virtual address from a host computer executing a guest virtual machine program and using the hardware oriented method of the host CPU to determine the guest physical address. A second level address translation to a host physical address is then performed. In one embodiment, a multiple tier tree is traversed which translates the guest physical address into a host physical address. In another embodiment, the second level of address translation is performed by employing a hash function of the guest physical address and a reference to a hash table. One aspect of the invention is the incorporation of access overrides associated with the host physical address which can control the access permissions of the host memory.

A system for increasing the efficiency of migrating, at least in part, a virtual machine from a source host to a destination host is described wherein the content of one or more portions of the address space of the virtual machine are each uniquely associated at the source host with a signature that may collide, absent disambiguation, with different content at the destination host. Code in both the source and destination hosts disambiguates the signature(s) so that each disambiguated signature may be uniquely associated with content at the destination host, and so that collisions with different content are avoided at the destination host. Logic is configured to determine whether the content uniquely associated with a disambiguated signature at the destination host is already present in the destination host memory, and, if so, to back one or more portions of the address space of the virtual machine having this content with one or more portions of the destination host memory already holding this content.

Processing within a computing environment that supports pageable guests is facilitated. Processing is facilitated in many ways, including, but not limited to, associating guest and host state information with guest blocks of storage; maintaining the state information in control blocks in host memory; enabling the changing of states; and using the state information in management decisions. In one particular example, the guest state includes an indication of usefulness and importance of memory contents to the guest, and the host state reflects the ease of access to memory contents. The host and guest state information is used in managing memory of the host and/or guests.

A method for communication includes inputting from a host processor to a network interface device a sequence of work requests indicative of operations to be carried out by the network interface device with respect to a plurality of the connections. The device looks ahead through the sequence in order to identify at least first and second operations that are to be carried out with respect to one of the connections in response to first and second work requests, respectively, wherein the second work request does not immediately follow the first work request in the sequence. The device loads the context data for the one of the connections from a host memory into a context cache, and performs at least the first and second operations sequentially while the context data are held in the cache.

A mechanism for performing remote direct memory access (RDMA) operations between a first server and a second server over an Ethernet fabric. The RDMA operations are initiated by execution of a verb according to a remote direct memory access protocol. The verb is executed by a CPU on the first server. The apparatus includes transaction logic that is configured to process a work queue element corresponding to the verb, and that is configured to accomplish the RDMA operations over a TCP/IP interface between the first and second servers, where the work queue element resides within first host memory corresponding to the first server. The transaction logic includes transmit history information stores and a protocol engine. The transmit history information stores maintains parameters associated with said work queue element. The protocol engine is coupled to the transmit history information stores and is configured to access the parameters to enable retransmission of one or more TCP segments corresponding to the RDMA operations.

An I/O adapter connects an I/O adapter to an I/O bus and includes a device interrupt status register and an interrupt status shadow address register. The device interrupt status register stores the interrupt status of the I/O adapter. The I/O adapter accesses the interrupt status shadow address register to determine an address of main memory at which the device interrupt status register is shadowed. After shadowing the interrupt status, the I/O adapter interrupts the processor complex which may then access local, main memory to determine the interrupt status. A multifunction I/O adapter permits a plurality of I/O adapters to be connected thereto and includes a function interrupt status register to summarize the interrupt status of all the I/O adapters attached thereto. After shadowing the summarized interrupt status, the multifunction I/O adapter interrupts the processor complex which may then access local, main memory to determine the interrupt status.

An apparatus is provided, for performing a direct memory access (DMA) operation between a host memory in a first server and a network adapter. The apparatus includes a host frame parser and a protocol engine. The host frame parser is configured to receive data corresponding to the DMA operation from a host interface, and is configured to insert markers on-the-fly into the data at a prescribed interval and to provide marked data for transmission to a second server over a network fabric. The protocol engine is coupled to the host frame parser. The protocol engine is configured to direct the host frame parser to insert the markers, and is configured to specify a first marker value and an offset value, whereby the host frame parser is enabled to locate and insert a first marker into the data.

A system and method for placement of sharing physical buffer lists in RDMA communication. According to one embodiment, a network adapter system for use in a computer system includes a host processor and host memory and is capable for use in network communication in accordance with a direct data placement (DDP) protocol. The DDP protocol specifies tagged and untagged data movement into a connection-specific application buffer in a contiguous region of virtual memory space of a corresponding endpoint computer application executing on said host processor. The DDP protocol specifies the permissibility of memory regions in host memory and specifies the permissibility of at least one memory window within a memory region. The memory regions and memory windows have independently definable application access rights, the network adapter system includes adapter memory and a plurality of physical buffer lists in the adapter memory. Each physical buffer list specifies physical address locations of host memory corresponding to one of said memory regions. A plurality of steering tag records are in the adapter memory, each steering tag record corresponding to a steering tag. Each steering tag record specifies memory locations and access permissions for one of a memory region and a memory window. Each physical buffer list is capable of having a one to many correspondence with steering tag records such that many memory windows may share a single physical buffer list. According to another embodiment, each steering tag record includes a pointer to a corresponding physical buffer list.

In managing and buffering packet data for transmission out of a host, descriptor ring data is pushed in from a host memory into a descriptor ring cache and cached therein. The descriptor ring data is processed to read a data packet descriptor, and a direct memory access is initiated to the host to read the data packet corresponding to the read data packet descriptor to a data transmission buffer. The data packet is written by the direct memory access into the data transmission buffer and cached therein. A return pointer is written to the host memory by the direct memory access indicating that the data packet descriptor has been read and the corresponding data packet has been transmitted. In managing and buffering packet data for transmission to a host, descriptor ring data is pushed in from a host memory into a descriptor ring cache and cached therein. Data packets for transmission to the host memory are received and cached in a data reception buffer. Data is read from the data reception buffer according to a data packet descriptor retrieved from the descriptor ring cache, and the data packet is written to a data reception queue within the host memory by a direct memory access. A return pointer is written to the host memory by the direct memory access indicating that the data packet has been written.

A system and method for placement of RDMA payload into application memory of a processor system. Under one embodiment, a network adapter system is capable of use in network communication in accordance with a direct data placement (DDP) protocol, e.g., RDMA. The network adapter system includes adapter memory and a plurality of placement records in the adapter memory. Each placement record specifies per-connection placement data including at least network address information and port identifications of source and destination network entities for a corresponding DDP protocol connection. Placement record identification logic uniquely identifies a placement record from network address information and port identification information contained in a DDP message received by the network adapter system. Untagged message payload placement logic directly places the payload of the received untagged DDP message into physical address locations of host memory corresponding to one of said connection-specific application buffers. Tagged message payload placement logic directly places the payload of the tagged DDP message into physical address locations of host memory corresponding to the identifier in the received DDP message. According to one embodiment, the placement records are organized as an array of hash buckets with each element of the array containing a placement record and each placement record containing a specification of a next placement record in the same bucket. The placement record identification logic includes hashing logic to create a hash index pointing to a bucket in the array by hashing a 4-tuple consisting of a source address, a destination address, a source port, and a destination port contained in the received DDP message.

A method for managing host system power consumption is provided. The host system includes host memory and external memory. The method initiates with providing a processor in communication with a memory chip over a bus. The memory chip is external memory. Then, a usage measurement of the external memory is determined. If the usage measurement is below a threshold value, the method includes copying data from the memory chip to the host memory and terminating power to the memory chip. In one embodiment, the power is terminated to at least one bank of memory in the memory chip. In another embodiment, an amount of reduction of the external memory can be determined rather than a usage measurement. In yet another embodiment, an address map is reconfigured in order to maintain a contiguous configuration. A graphical user interface and a memory chip are provided also.

A reagent management system for an automated biological reaction apparatus including an automated biological reaction apparatus including at least one reagent dispenser for applying a reagent to a sample, a memory device containing data for a reagent device selected from the group consisting of a reagent dispenser or a reagent kit used in the automated biological reaction apparatus, a host device comprising a processor and a host device memory connected to the processor, the host memory device including a reagent table, and a scanner for transferring the memory device data to the host device memory,

Certain aspects of a method and system for delayed completion coalescing may be disclosed. Exemplary aspects of the method may include accumulating a plurality of bytes of incoming TCP segments in a host memory until a number of the plurality of bytes of incoming TCP segments reaches a threshold value. A completion queue entry (CQE) may be generated to a driver when the plurality of bytes of incoming TCP segments reaches the threshold value and the plurality of bytes of incoming TCP segments may be copied to a user application. The method may also include delaying in a driver, an update of a TCP receive window size until one of the incoming TCP segments corresponding to a particular sequence number is copied to the user application. The CQE may also be generated to the driver when at least one of the incoming TCP segments is received with a TCP PUSH bit SET and the TCP receive window size is greater than a particular window size value.

Methods and apparatuses for a data processing system are described herein. In one aspect of the invention, an exemplary apparatus includes a chip interconnect, a memory controller for controlling the host memory comprising DRAM memory, the memory controller coupled to the chip interconnect, a scalar processing unit coupled the chip interconnect wherein the scalar processing unit is capable of executing instructions to perform scalar data processing, a vector processing unit coupled the chip interconnect wherein the vector processing unit is capable of executing instructions to perform vector data processing, and an input/output (I/O) interface coupled to the chip interconnect wherein the I/O interface receives/transmits data from/to the scalar and/or vector processing units.

Aspects of the invention may comprise receiving an incoming TCP packet at a TEEC and processing at least a portion of the incoming packet once by the TEEC without having to do any reassembly and/or retransmission by the TEEC. At least a portion of the incoming TCP packet may be buffered in at least one internal elastic buffer of the TEEC. The internal elastic buffer may comprise a receive internal elastic buffer and/or a transmit internal elastic buffer. Accordingly, at least a portion of the incoming TCP packet may be buffered in the receive internal elastic buffer. At least a portion of the processed incoming packet may be placed in a portion of a host memory for processing by a host processor or CPU. Furthermore, at least a portion of the processed incoming TCP packet may be DMA transferred to a portion of the host memory.

A system for interfacing with a co-processor or input/output device is disclosed. According to one embodiment, the system is configured to receive a command from a host memory controller of a host system and store the command in a command buffer entry. The system determines that the command is complete using a buffer check logic and provides the command to a command buffer. The command buffer comprises a first field that specifies an entry point of the command within the command buffer entry.

An apparatus and system having both PCI Root Port (RP) device and Direct Memory Access (DMA) End Point device functionality is disclosed. The apparatus is for use in an input/output (I/O) system interconnect module (IOSIM) device. A DMA/RP module includes a RP portion and one or more DMA/RP portions. The RP portion has one or more queue pipes and is configured to function as a standard PCIe Root Port device. Each of the DMA/RP portions includes DMA engines and DMA input and output channels, and is configured to behave more like an End Point device. The DMA/RP module also includes one or more PCIe hard core portions, an ICAM (I/O Caching Agent Module), and at least one PCIe service block (PSB). *The hard core portion couples the DMA/RP module and IOSIM device to an I/O device via a PCIe link, and the ICAM transitions data to a host memory device operating system.

Certain aspects of the present invention for transmission control protocol (TCP) retransmission processing may comprise receiving a request for packet retransmission to be processed by an offload network interface card (NIC). A remote peer, a retransmission timer, or a fast retransmission signal may initiate the request. The NIC processes the request information and sends notification to the host of the request. The host searches the TCP buffers of the TCP transmission window in host memory for the packet. Once the packet is located, the host may send the offload NIC the buffer descriptors containing data that locates the packet in host memory. The offload NIC may retrieve the packet from host memory and may retransmit the packet according to the request information. The offload NIC may send notification to the host that the packet has been retransmitted.

A data mirroring control apparatus includes a command distributing unit configured to transmit a first write command to a plurality of mirroring storage devices, the first write command including an instruction for data requested by a host to be written; and a memory lock setting unit configured to set a memory lock on the data requested by the host to be written among data stored in a host memory and configured to release the memory lock on the data after the data with the memory lock is written to the plurality of mirroring storage devices.