Server delay control device, server delay control method and program

A non-transitory computer-readable storage medium storing instructions that upon execution, cause a computer to operate as a server delay controller that is arranged in a user space and includes a thread that monitors packet reception from an interface unit;

• using a polling model, wherein execution of the instructions causes the computer operating as the server delay controller to perform operations comprising:
• executing harvesting of a packet held in a ring buffer when a packet arrives and;
• managing sleep by putting the thread to sleep in a case in which a packet does not arrive for a predetermined period and cancelling the sleep of the thread;
• and
• managing pre-wakeup control for waking up the thread immediately before the packet arrival in accordance with a packet arrival timing when the packet arrival timing can be predicted.

A non-transitory computer-readable storage medium storing instructions that upon execution, cause a computer to operate as a server delay controller wherein

• a guest operating system (OS) that operates in a virtual machine includes:
• a kernel,
• a ring buffer that is managed by the kernel in a memory space in a server including the guest OS,
• a packet arrival monitoring unit that monitors packet arrival from an interface unit,
• a packet harvesting unit that executes harvesting of a packet held in the ring buffer when a packet arrives, and
• the server delay controller that starts a thread that monitors packet arrival using a polling model in the kernel, and
• the server delay controller includes:
• a sleep management unit that puts the thread to sleep in a case in which a packet does not arrive for a predetermined period, and
• a management unit that executes pre-wakeup control for waking up the thread immediately before the packet arrival in accordance with a packet arrival timing, when the packet arrival timing can be predicted.

A server delay control method of a server delay controller that is arranged in a kernel space of an OS, implemented by a computer when the computer executes instructions, and starts a thread that monitors packet arrival using a polling model to execute packet processing, the server delay controller executing:

• monitoring a poll list that registers net device information indicating which device a hardware interrupt from an interface unit comes from;
• referring to a packet held in a ring buffer and executing harvesting to delete an entry of a corresponding queue from the ring buffer when a packet arrives;
• putting the thread to sleep and canceling the sleep of the thread with a hardware interrupt at a time of packet arrival, and
• executing pre-wakeup control for waking up the thread immediately before the packet arrival in accordance with a packet arrival timing, when the packet arrival timing can be predicted.

A server delay control method of a server delay controller that is arranged in a user space, implemented by a computer when the computer executes instructions, and starts a thread that monitors packet arrival using a polling model,

• the server delay controller executing:
• monitoring packet arrival from an interface unit;
• referring to a packet held in a ring buffer when a packet arrives and executing harvesting to delete an entry of a corresponding queue from the ring buffer;
• putting the thread to sleep and canceling the sleep of the thread through a hardware interrupt at a time of packet arrival;
• and
• executing pre-wakeup control for waking up the thread immediately before the packet arrival in accordance with a packet arrival timing, when the packet arrival timing can be predicted.