Nippon Telegraph and Telephone Corporation

Ntt Corporation

Kei Fujimoto

Tetsuro Nakamura

Shogo Saito

Masashi Kaneko

Makoto Araoka

Kohei Matoba

Maiko Arai

Ko Natori

Takeshi Fukumoto

Mizuki Ikegaya

An operation system of a client includes: an L3/L4 protocol and ACC function and argument data packetizing unit that serializes a function name and argument input from an application side according to a format of a predetermined protocol and packetizes the function name/argument as a payload; and an L3/L4 protocol and ACC function and return value data parsing unit that deserializes packet data input from a server side according to a format of a predetermined protocol and acquires a function name/execution result.

Arithmetic processing offload system, client, server, and arithmetic processing offload method

A server delay controller includes: a sleep management unit that makes a thread sleep when no packet arrives for a predetermined period and cancels the sleep of the thread with a hardware interrupt when the packet arrives; a HW interrupt frequency management table that stores the number of times of hardware interrupt; and a HW interrupt frequency control unit that calculates a HW interrupt frequency on the basis of the number of times of hardware interrupt and controls HW interrupt permission or prohibition by sleep of the sleep management unit on the basis of the calculated HW interrupt frequency.

Server delay control device, server delay control method and program

Provided is a server delay control device for a server in which an OS having a kernel is deployed. The OS includes: a ring buffer managed by the kernel; and a poll list in which information on a net device of a hardware interrupt from an NIC is registered. The server delay control device is deployed in the server and configured to receive a timer interrupt at predetermined specified intervals and monitors a packet arrival and includes: a packet arrival monitoring part configured to check the presence or absence of a packet in the poll list upon being triggered by the timer interrupt to monitor the poll list; and a packet dequeuer configured to, when a packet has arrived, reference the packet held in the ring buffer, and perform dequeuing to remove the corresponding queue entry from the ring buffer.

Server delay control device, server delay control method, and program

A communication system in which a server-side system and a client-side system are communicably connected via a network, the server-side system including: an information reception unit that receives an input information packet including input information and loss chunk numbers from the client-side system; a video processing unit that generates video data; a chunking function unit that chunks the video data and assigns a number to each chunk; a chunk loss determination unit that calculates a chunk loss rate and determines a transmission interval on the basis of a transmission interval determination logic; and a transmission control unit that transmits the chunked video data to the client-side system.

Communication system, communication method, server, client terminal, and program

In a time synchronization system, a network controller sets transmission distance information on a transmission distance through which an optical signal is transmitted between transmission and receiving servers via a queueless network to a receiving server, based on network topology information. The transmitting server transmits a transmitting side current time synchronized with a reference time to the receiving servervia the queueless network. The receiving server calculates a transmission delay time between the transmission and receiving servers by dividing the transmission distance, which is based on the set transmission distance information, by light speed in the queueless network. A receiving side current time is calculated by adding the transmission delay time to the transmitting side current time.

Time synchronization system, receiving server and time synchronization method

Provided is a server delay control device deployed in a kernel of an OS of a server. The OS includes: the kernel; a ring buffer managed by the kernel, in a memory space in which the server deploys the OS; and a poll list in which packet arrival information indicative of the presence of a packet in the ring buffer is to be registered. The server delay control device spawns a thread configured to monitor a packet arrival according to a polling model. The thread includes: a packet arrival monitoring part configured to monitor whether the packet arrival information has been registered in the poll list, and a packet dequeuer configured to, when the packet arrival information has been registered in the poll list, dequeue the packet from the ring buffer on the basis of the packet arrival information.

The processing performance of an entire system is enhanced by efficiently using CPU resources shared by a plurality of guests. A serverincludes a host OSand a plurality of guest OSsA andB running on a plurality of virtual machinesA andB, respectively, which are virtually constructed on the host OS. The plurality of virtual machinesA andB shares CPU resources implemented by hardware. A guest priority calculation unitof a resource management device (resource management unit) calculates a processing priority of at least one of the guest OSsbased on at least one of a packet transfer rate from the host OSto the guest OSand an available capacity status of a kernel buffer of the host OS. A resource utilization control unitcontrols allocation of a utilization time for CPU resources to be used by the plurality of guest OSsbased on the calculated processing priority.

Resource management device and resource management method

Provided is a server delay control system for performing, on a server including a Host OS, packet transfer between a physical NIC connected to the Host OS and an application deployed in a user space. A server delay control device configured to perform polling for packet transfer on behalf of the application is deployed in the user space. The server delay control device creates, between the application and the physical NIC, a communication path for communication via socket communication. The communication path includes a first queue and a second queue. The server delay control device includes: a packet dequeuer configured to poll whether a packet has been enqueued into the first queue and to dequeue the enqueued packet from the first queue; and a packet enqueuer configured to enqueue the dequeued packet into the second queue in the same context as the polling and dequeuing without causing a context switch.

Growing community of inventors

Musashino, Japan

Kei Fujimoto