Transcript Document

• Work Schedule
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Network scheduler
A network scheduler, also called packet
scheduler, is an arbiter program that
manages the sequence of network
packets in the transmit and receive
queues of the network interface controller,
which is a circular data buffer. There are
several network schedulers available for
the different operating system kernels, that
implement more or less of the existent
network scheduling-algorithms.
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Network scheduler
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The network scheduler is the piece of
software, by which active queue
management or traffic shaping is
accomplished.
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Network scheduler - Linux kernel
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The currently available network scheduler
for the Linux kernel is an integral part of
the Linux network stack; it arbiters the
ringbuffers of all NICs, hence it works on
layer 2 of the OSI model and handles
Ethernet frames. It manages the transmit
and receive buffers of all present NICs.
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Network scheduler - Linux kernel
The user space programs ifconfig and ip
enable the system administrator to regulate
the buffer sizes: txqueuelen /rxqueuelen; the
unit being number of Ethernet frames
(regardless of their size) for each device
separately. The Linux network stack contains
several other buffers, which are not managed
by the network scheduler. The overall size of
all buffers has been the point of critique by
the Bufferbloat project.
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Network scheduler - Linux kernel
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Another network scheduler is
being developed as part of
Netfilter.
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Network scheduler - BSD
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ALTQ is the implementation of a network scheduler
for Berkeley Software Distribution.
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Network scheduler - Functioning
The network scheduler logic decides
similar to a statistical multiplexer which
network packet to forward next from the
buffer. The buffer works as a queuing
system, where the network packets are
stored temporarily until they are
transmitted. The buffer space is divided
into many queues, each of which is used
to hold the packets of one flow, defined
for instance by source and destination IP
addresses.
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Network scheduler - Functioning
The in each case loaded network
scheduling algorithm and the settings
determine how the network scheduler
manages the buffer.
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Network scheduler - Bufferbloat
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High latency and jitter are phenomenons
encountered due to the coincidence of
bufferbloat and high traffic volume. Though
the network scheduler manages only the
transmit (and receive) queue of the
network controller, and more buffers exist,
by the adoption of the CoDel queueing
disclipine, a significant reduction of the
effect has been achieved.
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Network scheduler - Buzzwords
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Though the task of a network scheduler is not that
complicated, a lot of buzzwords are around:
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Netfilter - Network scheduler
There are plans to implement the
functionality of the Network scheduler ins
user-space as a part of Netfilter.
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Linux Network Scheduler
A 'network scheduler', also called 'packet
scheduler', is an Arbiter (electronics)|arbiter
program that manages the sequence of
network packets in the transmit and receive
queue (abstract data type)|queues of the
network interface controller, which is a
circular buffer|circular data buffer. There are
several network schedulers available for the
different operating system Kernel
(computing)|kernels, that implement many of
the existing network scheduling algorithms.
1
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Linux Network Scheduler
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Also, network schedulers are enabling
accomplishment of the active queue
management and traffic shaping.
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Linux Network Scheduler - Linux kernel
The user space programs ifconfig and
Iproute2|ip enable the system
administrator to regulate the buffer sizes:
txqueuelen /rxqueuelen; the unit being
number of Ethernet frames (regardless of
their size) for each device separately. The
Linux network stack contains several other
buffers, which are not managed by the
network scheduler. The overall size of all
buffers has been the point of critique by
the Bufferbloat project.
1
https://store.theartofservice.com/the-work-schedule-toolkit.html
Linux Network Scheduler - Functioning
The network scheduler logic decides
similar to a statistical multiplexer which
network packet to forward next from the
buffer (computer science)|buffer. The
buffer works as a queuing system, where
the network packets are stored
temporarily until they are transmitted.
The buffer space is divided into many
queues, each of which is used to hold the
packets of one flow, defined for instance
by source and destination IP addresses.
1
https://store.theartofservice.com/the-work-schedule-toolkit.html
Linux Network Scheduler - Bufferbloat
High latency (engineering)|latency and
packet delay variation|jitter are
phenomenons encountered due to the
coincidence of bufferbloat and high traffic
volume. Though the network scheduler
manages only the transmit (and receive)
queue of the network controller, and more
buffers exist, by the adoption of the CoDel
queueing disclipine, a significant reduction
of the effect has been achieved.
1
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Shared Earning/Shared Parenting Marriage - Work schedules and outsourced child care
and chores
Some couples seek reduced work
schedules, such as 30-hour or 35-hour
work weeks, while others will work
full-time and outsource child care and
house chores
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