There are a couple of command line parameters for enabling the out-of-band
monitoring of branch ratios on cores doing busy polling using PMDs as
-described in the following table.
+described below:
-Table 1 – Command Line Options for Enabling Out-of-band Monitoring of
-Branch Ratios
-
-=============================== ==============================================
-**Command Line Option** **Description**
-=============================== ==============================================
-``--core-list {list of cores}`` | Specify the list of cores to monitor the ratio of branch misses
- | to branch hits. A tightly-polling PMD thread has a very low
- | branch ratio, therefore the core frequency scales down to the
- | minimum allowed value. On receiving packets, the code path changes,
- | causing the branch ratio to increase. When the ratio goes above
- | the ratio threshold, the core frequency scales up to the maximum
- | allowed value.
-``--branch-ratio {ratio}`` | Specify a floating-point number that identifies the threshold at which
- | to scale up or down for the given workload. The default branch ratio
- | is 0.01 and needs adjustment for different workloads.
-=============================== ==============================================
+``--core-list {list of cores}``
+ Specify the list of cores to monitor the ratio of branch misses
+ to branch hits. A tightly-polling PMD thread has a very low
+ branch ratio, therefore the core frequency scales down to the
+ minimum allowed value. On receiving packets, the code path changes,
+ causing the branch ratio to increase. When the ratio goes above
+ the ratio threshold, the core frequency scales up to the maximum
+ allowed value.
+``--branch-ratio {ratio}``
+ Specify a floating-point number that identifies the threshold at which
+ to scale up or down for the given workload. The default branch ratio
+ is 0.01 and needs adjustment for different workloads.
Compiling and Running the Guest Applications
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Optionally, there are several command line options for a user who needs
-to send a power policy to the host application. The following table
-describes these options.
-
-Table 1 – Command Line Options Available When Sending a Policy to the Host
-
-======================================= ======================================
-**Command Line Option** **Description**
-======================================= ======================================
-``--vm-name {name of guest vm}`` | Allows the user to change the virtual machine name passed
- | down to the host application using the power policy. The
- | default is ubuntu2.
-``--vcpu-list {list vm cores}`` | A comma-separated list of cores in the VM that the user
- | wants the host application to monitor. The list of cores
- | in any vm starts at zero, and the host application maps
- | these to the physical cores once the policy passes down
- | to the host. Valid syntax includes individual cores
- | 2,3,4, a range of cores 2-4, or a combination of both
- | 1,3,5-7.
-``--busy-hours {list of busy hours}`` | A comma-separated list of hours in which to set the core
- | frequency to the maximum. Valid syntax includes
- | individual hours 2,3,4, a range of hours 2-4, or a
- | combination of both 1,3,5-7. Valid hour values are 0 to 23.
-``--quiet-hours {list of quiet hours}`` | A comma-separated list of hours in which to set the core
- | frequency to minimum. Valid syntax includes individual
- | hours 2,3,4, a range of hours 2-4, or a combination of
- | both 1,3,5-7. Valid hour values are 0 to 23.
-``--policy {policy type}`` | The type of policy. This can be one of the following values:
-
- - | TRAFFIC Based on incoming traffic rates on the NIC.
-
- - | TIME - Uses a busy/quiet hours policy.
-
- - | BRANCH_RATIO - Uses branch ratio counters to determine
- | core busyness.
-
- - | WORKLOAD - Sets the frequency to low, medium or high
- | based on the received policy setting.
-
- | **Note**: Not all policy types need all parameters. For
- | example, BRANCH_RATIO only needs the vcpu-list
- | parameter.
-======================================= ======================================
+to send a power policy to the host application:
+
+``--vm-name {name of guest vm}``
+ Allows the user to change the virtual machine name
+ passed down to the host application using the power policy.
+ The default is ubuntu2.
+
+``--vcpu-list {list vm cores}``
+ A comma-separated list of cores in the VM that the user
+ wants the host application to monitor.
+ The list of cores in any VM starts at zero,
+ and the host application maps these to the physical cores
+ once the policy passes down to the host.
+ Valid syntax includes individual cores 2,3,4,
+ a range of cores 2-4, or a combination of both 1,3,5-7.
+
+``--busy-hours {list of busy hours}``
+ A comma-separated list of hours in which to set the core
+ frequency to the maximum.
+ Valid syntax includes individual hours 2,3,4,
+ a range of hours 2-4, or a combination of both 1,3,5-7.
+ Valid hour values are 0 to 23.
+
+``--quiet-hours {list of quiet hours}``
+ A comma-separated list of hours in which to set the core frequency
+ to minimum. Valid syntax includes individual hours 2,3,4,
+ a range of hours 2-4, or a combination of both 1,3,5-7.
+ Valid hour values are 0 to 23.
+
+``--policy {policy type}``
+ The type of policy. This can be one of the following values:
+
+ - TRAFFIC - Based on incoming traffic rates on the NIC.
+ - TIME - Uses a busy/quiet hours policy.
+ - BRANCH_RATIO - Uses branch ratio counters to determine core busyness.
+ - WORKLOAD - Sets the frequency to low, medium or high
+ based on the received policy setting.
+
+ **Note**: Not all policy types need all parameters.
+ For example, BRANCH_RATIO only needs the vcpu-list parameter.
After successful initialization, the VM Power Manager Guest CLI prompt
appears:
avg_packet_thresh
^^^^^^^^^^^^^^^^^
-================== ===========================================================
- **Pair Name:** "avg_packet_thresh"
-================== ===========================================================
- **Description:** | The threshold below which the frequency is set to the minimum value for the
- | TRAFFIC policy. If the traffic rate is above this value and below the
- | maximum value, the frequency is set to medium.
- **Type:** integer
- **Values:** | The number of packets below which the TRAFFIC policy applies the minimum
- | frequency, or the medium frequency if between the average and maximum
- | thresholds.
- **Required:** Yes
- **Example:** ``"avg_packet_thresh": 100000``
-================== ===========================================================
+Description
+ The threshold below which the frequency is set to the minimum value
+ for the TRAFFIC policy.
+ If the traffic rate is above this value and below the maximum value,
+ the frequency is set to medium.
+Type
+ integer
+Values
+ The number of packets below which the TRAFFIC policy applies
+ the minimum frequency, or the medium frequency
+ if between the average and maximum thresholds.
+Required
+ Yes
+Example
+ ``"avg_packet_thresh": 100000``
busy_hours
^^^^^^^^^^
-================== ===========================================================
- **Pair Name:** "busy_hours"
-================== ===========================================================
- **Description:** The hours of the day in which we scale up the cores for busy times.
- **Type:** array of integers
- **Values:** An array with a list of hour values (0-23).
- **Required:** For the TIME policy only.
- **Example:** ``"busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ]``
-================== ===========================================================
+Description
+ The hours of the day in which we scale up the cores for busy times.
+Type
+ array of integers
+Values
+ An array with a list of hour values (0-23).
+Required
+ For the TIME policy only.
+Example
+ ``"busy_hours":[ 17, 18, 19, 20, 21, 22, 23 ]``
command
^^^^^^^
-================== ===========================================================
- **Pair Name:** "command"
-================== ===========================================================
- **Description:** | The type of packet to send to the VM Power Manager. It is possible to create
- | or destroy a policy or send a direct command to adjust the frequency of a core,
- | as is possible on the command line interface.
- **Type:** | string
- **Values:** Possible values are:
-
- - CREATE: Create a new policy.
- - DESTROY: Remove an existing policy.
- - POWER: Send an immediate command, max, min, and so on.
-
- **Required:** Yes
- **Example:** ``"command": "CREATE"``
-================== ===========================================================
+Description
+ The type of packet to send to the VM Power Manager.
+ It is possible to create or destroy a policy or send a direct command
+ to adjust the frequency of a core,
+ as is possible on the command line interface.
+Type
+ string
+Values
+ Possible values are:
+ - CREATE: Create a new policy.
+ - DESTROY: Remove an existing policy.
+ - POWER: Send an immediate command, max, min, and so on.
+Required
+ Yes
+Example
+ ``"command": "CREATE"``
core_list
^^^^^^^^^
-================== ===========================================================
- **Pair Name:** "core_list"
-================== ===========================================================
- **Description:** The cores to which to apply a policy.
- **Type:** array of integers
- **Values:** An array with a list of virtual CPUs.
- **Required:** For CREATE/DESTROY policy requests only.
- **Example:** ``"core_list":[ 10, 11 ]``
-================== ===========================================================
+Description
+ The cores to which to apply a policy.
+Type
+ array of integers
+Values
+ An array with a list of virtual CPUs.
+Required
+ For CREATE/DESTROY policy requests only.
+Example
+ ``"core_list":[ 10, 11 ]``
mac_list
^^^^^^^^
-================== ===========================================================
- **Pair Name:** "mac_list"
-================== ===========================================================
- **Description:** | When the policy is of type TRAFFIC, it is necessary to specify the MAC addresses
- | that the host must monitor.
- **Type:** | array of strings
- **Values:** An array with a list of mac address strings.
- **Required:** For TRAFFIC policy types only.
- **Example:** ``"mac_list":[ "de:ad:be:ef:01:01","de:ad:be:ef:01:02" ]``
-================== ===========================================================
-
+Description
+ When the policy is of type TRAFFIC,
+ it is necessary to specify the MAC addresses that the host must monitor.
+Type
+ array of strings
+Values
+ An array with a list of MAC address strings.
+Required
+ For TRAFFIC policy types only.
+Example
+ ``"mac_list":[ "de:ad:be:ef:01:01","de:ad:be:ef:01:02" ]``
max_packet_thresh
^^^^^^^^^^^^^^^^^
-================== ===========================================================
- **Pair Name:** "max_packet_thresh"
-================== ===========================================================
- **Description:** | In a policy of type TRAFFIC, the threshold value above which the frequency is set
- | to a maximum.
- **Type:** | integer
- **Values:** | The number of packets per interval above which the TRAFFIC
- | policy applies the maximum frequency.
- **Required:** For the TRAFFIC policy only.
- **Example:** ``"max_packet_thresh": 500000``
-================== ===========================================================
+Description
+ In a policy of type TRAFFIC,
+ the threshold value above which the frequency is set to a maximum.
+Type
+ integer
+Values
+ The number of packets per interval above which
+ the TRAFFIC policy applies the maximum frequency.
+Required
+ For the TRAFFIC policy only.
+Example
+ ``"max_packet_thresh": 500000``
name
^^^^
-================== ===========================================================
- **Pair Name:** "name"
-================== ===========================================================
- **Description:** | The name of the VM or host. Allows the parser to associate the policy with the
- | relevant VM or host OS.
- **Type:** | string
- **Values:** Any valid string.
- **Required:** Yes
- **Example:** ``"name": "ubuntu2"``
-================== ===========================================================
+Description
+ The name of the VM or host.
+ Allows the parser to associate the policy with the relevant VM or host OS.
+Type
+ string
+Values
+ Any valid string.
+Required
+ Yes
+Example
+ ``"name": "ubuntu2"``
policy_type
^^^^^^^^^^^
-================== ===========================================================
- **Pair Name:** "policy_type"
-================== ===========================================================
- **Description:** | The type of policy to apply. See the ``--policy`` option description for more
- | information.
- **Type:** string
- **Values:** Possible values are:
-
- - | TIME: Time-of-day policy. Scale the frequencies of the relevant cores up/down
- | depending on busy and quiet hours.
- - | TRAFFIC: Use statistics from the NIC and scale up and down accordingly.
- - | WORKLOAD: Determine how heavily loaded the cores are and scale up and down
- | accordingly.
- - | BRANCH_RATIO: An out-of-band policy that looks at the ratio between branch
- | hits and misses on a core and uses that information to determine how much
- | packet processing a core is doing.
-
- **Required:** For ``CREATE`` and ``DESTROY`` policy requests only.
- **Example:** ``"policy_type": "TIME"``
-================== ===========================================================
+Description
+ The type of policy to apply.
+ See the ``--policy`` option description for more information.
+Type
+ string
+Values
+ Possible values are:
+
+ - TIME: Time-of-day policy.
+ Scale the frequencies of the relevant cores up/down
+ depending on busy and quiet hours.
+ - TRAFFIC: Use statistics from the NIC and scale up and down accordingly.
+ - WORKLOAD: Determine how heavily loaded the cores are
+ and scale up and down accordingly.
+ - BRANCH_RATIO: An out-of-band policy that looks at the ratio
+ between branch hits and misses on a core
+ and uses that information to determine how much packet processing
+ a core is doing.
+
+Required
+ For ``CREATE`` and ``DESTROY`` policy requests only.
+Example
+ ``"policy_type": "TIME"``
quiet_hours
^^^^^^^^^^^
-================== ===========================================================
- **Pair Name:** "quiet_hours"
-================== ===========================================================
- **Description:** | The hours of the day to scale down the cores for quiet times.
- **Type:** array of integers
- **Values:** | An array with a list of hour numbers with values in the range 0 to 23.
- **Required:** For the TIME policy only.
- **Example:** ``"quiet_hours":[ 2, 3, 4, 5, 6 ]``
-================== ===========================================================
+Description
+ The hours of the day to scale down the cores for quiet times.
+Type
+ array of integers
+Values
+ An array with a list of hour numbers with values in the range 0 to 23.
+Required
+ For the TIME policy only.
+Example
+ ``"quiet_hours":[ 2, 3, 4, 5, 6 ]``
resource_id
^^^^^^^^^^^
-================== ===========================================================
- **Pair Name:** "resource_id"
-================== ===========================================================
- **Description:** The core to which to apply a power command.
- **Type:** integer
- **Values:** A valid core ID for the VM or host OS.
- **Required:** For the ``POWER`` instruction only.
- **Example:** ``"resource_id": 10``
-================== ===========================================================
+Description
+ The core to which to apply a power command.
+Type
+ integer
+Values
+ A valid core ID for the VM or host OS.
+Required
+ For the ``POWER`` instruction only.
+Example
+ ``"resource_id": 10``
unit
^^^^
-================== ===========================================================
- **Pair Name:** "unit"
-================== ===========================================================
- **Description:** The type of power operation to apply in the command.
- **Type:** string
- **Values:** - SCALE_MAX: Scale the frequency of this core to the maximum.
- - SCALE_MIN: Scale the frequency of this core to the minimum.
- - SCALE_UP: Scale up the frequency of this core.
- - SCALE_DOWN: Scale down the frequency of this core.
- - ENABLE_TURBO: Enable Intel® Turbo Boost Technology for this core.
- - DISABLE_TURBO: Disable Intel® Turbo Boost Technology for this core.
- **Required:** For the ``POWER`` instruction only.
- **Example:** ``"unit": "SCALE_MAX"``
-================== ===========================================================
+Description
+ The type of power operation to apply in the command.
+Type
+ string
+Values
+ - SCALE_MAX: Scale the frequency of this core to the maximum.
+ - SCALE_MIN: Scale the frequency of this core to the minimum.
+ - SCALE_UP: Scale up the frequency of this core.
+ - SCALE_DOWN: Scale down the frequency of this core.
+ - ENABLE_TURBO: Enable Intel® Turbo Boost Technology for this core.
+ - DISABLE_TURBO: Disable Intel® Turbo Boost Technology for this core.
+Required
+ For the ``POWER`` instruction only.
+Example
+ ``"unit": "SCALE_MAX"``
workload
^^^^^^^^
-================== ===========================================================
- **Pair Name:** "workload"
-================== ===========================================================
- **Description:** In a policy of type WORKLOAD, it is necessary to specify
- how heavy the workload is.
- **Type:** string
- **Values:** - HIGH: Scale the frequency of this core to maximum.
- - MEDIUM: Scale the frequency of this core to minimum.
- - LOW: Scale up the frequency of this core.
- **Required:** For the ``WORKLOAD`` policy only.
- **Example:** ``"workload": "MEDIUM"``
-================== ===========================================================
-
+Description
+ In a policy of type WORKLOAD,
+ it is necessary to specify how heavy the workload is.
+Type
+ string
+Values
+ - HIGH: Scale the frequency of this core to maximum.
+ - MEDIUM: Scale the frequency of this core to minimum.
+ - LOW: Scale up the frequency of this core.
+Required
+ For the ``WORKLOAD`` policy only.
+Example
+ ``"workload": "MEDIUM"``
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