NVME-SNDK-SET-LAT(1)

NAME
nvme-sndk-set-latency-monitor-feature - Set NVMe sndk latency monitor feature options

SYNOPSIS

nvme [<global-options>] sndk set-latency-monitor-feature <device>
                        [--active_bucket_timer_threshold=<NUM> | -t <NUM>]
                        [--active_threshold_a=<NUM> | -a <NUM>]
                        [--active_threshold_b=<NUM> | -b <NUM>]
                        [--active_threshold_c=<NUM> | -c <NUM>]
                        [--active_threshold_d=<NUM> | -d <NUM>]
                        [--active_latency_config=<NUM> | -f <NUM>]
                        [--active_latency_minimum_window=<NUM> | -w <NUM>]
                        [--debug_log_trigger_enable=<NUM> | -r <NUM>]
                        [--discard_debug_log=<NUM> | -l <NUM>]
                        [--latency_monitor_feature_enable=<NUM> | -e <NUM>]

DESCRIPTION

For the NVMe device given, this command set the latency monitor feature options (if supported by the device).

The <device> parameter is mandatory NVMe character device (ex: /dev/nvme0).

Setting results can be checked with get-latency-monitor-log command.

On success it returns 0, error code otherwise.

OPTIONS

-t <NUM>, --active_bucket_timer_threshold=<NUM>
    The value that loads the Active Bucket Timer Threshold; default value is 07E0h.

-a <NUM>, --active_threshold_a=<NUM>
    The value that loads into the Active Threshold A; default value is 05h.

-b <NUM>, --active_threshold_b=<NUM>
    The value that loads into the Active Threshold B; default value is 13h.

-c <NUM>, --active_threshold_c=<NUM>
    The value that loads into the Active Threshold C; default value is 1Eh.

-d <NUM>, --active_threshold_d=<NUM>
    The value that loads into the Active Threshold D; default value is 2Eh.

-f <NUM>, --active_latency_config=<NUM>
    The value that loads into the Active Latency Configuration. This configures how both the Active Latency Stamp, and the Active Measured Latency Fields are updated on a per I/O command (Read, Write, Deallocate) counter basis; default value is 0FFFh.

-w <NUM>, --active_latency_minimum_window=<NUM>
    The value that loads into the Active Latency Minimum Window; default value is 0Ah.

-r <NUM>, --debug_log_trigger_enable=<NUM>
    The value that loads into the Debug Log Trigger Enable; When set to 1b the first time the bucket/counter combination is incremented a debug log is triggered. When cleared to 0b a debug log will not be triggered when the bucket/counter combination is incremented.

-l <NUM>, --discard_debug_log=<NUM>
    Discard Debug Log. When cleared to 00h the debug log, if it exists, will not be cleared. When set to 01h the debug log will be discarded so another log can be triggered. All the fields in the Set Features Data structure are valid. When set to 02h the debug log will be discarded so another log can be triggered. None of the other fields of the Set Features Data structure are valid.

-e <NUM>, --latency_monitor_feature_enable=<NUM>
    Latency Monitor Feature Enable; When set to 01h the Latency Monitor Feature is enabled. When cleared to 00h the Latency Monitor Feature is disabled.

GLOBAL OPTIONS

The following options are defined at the top-level nvme command and are available to this subcommand:

--dry-run
    Print the command that would be executed, but do not actually execute it.

--no-ioctl-probing
    Disable probing for 64-bit IOCTL support.

--no-retries
    Disable retry logic on transient errors.

-o <fmt>, --output-format=<fmt>
    Set the reporting format to normal, tabular, 'json, or binary. Only one output format may be used at a time.

--output-format-version=<version>
    Select the output format version. Version 1 uses the original field naming, while version 2 (default) provides more consistent and script-friendly field names.

--timeout=<ms>
    Set the timeout for the command in milliseconds.

-v, --verbose
    Increase the level of detail in the output. May be specified multiple times to further increase verbosity.

These options can also be set as machine-wide defaults in nvme-cli.conf(5). A command-line flag always overrides the file.

EXAMPLES

    • Set NVMe sndk latency monitor feature options enabled with default value values:

        # nvme sndk set-latency-monitor-feature /dev/nvme0 -e 1

    • Set NVMe sndk latency monitor feature options disabled with default value values:

        # nvme sndk set-latency-monitor-feature /dev/nvme0 -e 0

    • Set NVMe sndk latency monitor feature options enabled with specific values:

        # nvme sndk set-latency-monitor-feature /dev/nvme0 --active_bucket_timer_threshold=1 \
                    --active_threshold_a=0x0 \
                    --active_threshold_b=0x1 \
                    --active_threshold_c=0x2 \
                    --active_threshold_d=0x3 \
                    --active_latency_config=0xfff \
                    --active_latency_minimum_window=0 \
                    --debug_log_trigger_enable=0 \
                    --discard_debug_log=0 \
                    --latency_monitor_feature_enable=0x1

NVME

Part of the nvme-user suite.