137 lines
4.4 KiB
ReStructuredText
137 lines
4.4 KiB
ReStructuredText
======================================
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HNS3 Performance Monitoring Unit (PMU)
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======================================
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HNS3(HiSilicon network system 3) Performance Monitoring Unit (PMU) is an
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End Point device to collect performance statistics of HiSilicon SoC NIC.
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On Hip09, each SICL(Super I/O cluster) has one PMU device.
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HNS3 PMU supports collection of performance statistics such as bandwidth,
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latency, packet rate and interrupt rate.
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Each HNS3 PMU supports 8 hardware events.
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HNS3 PMU driver
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===============
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The HNS3 PMU driver registers a perf PMU with the name of its sicl id.::
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/sys/devices/hns3_pmu_sicl_<sicl_id>
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PMU driver provides description of available events, filter modes, format,
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identifier and cpumask in sysfs.
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The "events" directory describes the event code of all supported events
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shown in perf list.
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The "filtermode" directory describes the supported filter modes of each
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event.
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The "format" directory describes all formats of the config (events) and
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config1 (filter options) fields of the perf_event_attr structure.
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The "identifier" file shows version of PMU hardware device.
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The "bdf_min" and "bdf_max" files show the supported bdf range of each
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pmu device.
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The "hw_clk_freq" file shows the hardware clock frequency of each pmu
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device.
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Example usage of checking event code and subevent code::
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$# cat /sys/devices/hns3_pmu_sicl_0/events/dly_tx_normal_to_mac_time
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config=0x00204
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$# cat /sys/devices/hns3_pmu_sicl_0/events/dly_tx_normal_to_mac_packet_num
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config=0x10204
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Each performance statistic has a pair of events to get two values to
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calculate real performance data in userspace.
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The bits 0~15 of config (here 0x0204) are the true hardware event code. If
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two events have same value of bits 0~15 of config, that means they are
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event pair. And the bit 16 of config indicates getting counter 0 or
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counter 1 of hardware event.
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After getting two values of event pair in usersapce, the formula of
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computation to calculate real performance data is:::
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counter 0 / counter 1
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Example usage of checking supported filter mode::
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$# cat /sys/devices/hns3_pmu_sicl_0/filtermode/bw_ssu_rpu_byte_num
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filter mode supported: global/port/port-tc/func/func-queue/
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Example usage of perf::
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$# perf list
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hns3_pmu_sicl_0/bw_ssu_rpu_byte_num/ [kernel PMU event]
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hns3_pmu_sicl_0/bw_ssu_rpu_time/ [kernel PMU event]
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------------------------------------------
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$# perf stat -g -e hns3_pmu_sicl_0/bw_ssu_rpu_byte_num,global=1/ -e hns3_pmu_sicl_0/bw_ssu_rpu_time,global=1/ -I 1000
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or
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$# perf stat -g -e hns3_pmu_sicl_0/config=0x00002,global=1/ -e hns3_pmu_sicl_0/config=0x10002,global=1/ -I 1000
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Filter modes
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--------------
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1. global mode
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PMU collect performance statistics for all HNS3 PCIe functions of IO DIE.
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Set the "global" filter option to 1 will enable this mode.
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Example usage of perf::
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$# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,global=1/ -I 1000
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2. port mode
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PMU collect performance statistic of one whole physical port. The port id
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is same as mac id. The "tc" filter option must be set to 0xF in this mode,
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here tc stands for traffic class.
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Example usage of perf::
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$# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,port=0,tc=0xF/ -I 1000
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3. port-tc mode
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PMU collect performance statistic of one tc of physical port. The port id
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is same as mac id. The "tc" filter option must be set to 0 ~ 7 in this
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mode.
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Example usage of perf::
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$# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,port=0,tc=0/ -I 1000
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4. func mode
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PMU collect performance statistic of one PF/VF. The function id is BDF of
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PF/VF, its conversion formula::
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func = (bus << 8) + (device << 3) + (function)
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for example:
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BDF func
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35:00.0 0x3500
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35:00.1 0x3501
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35:01.0 0x3508
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In this mode, the "queue" filter option must be set to 0xFFFF.
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Example usage of perf::
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$# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,bdf=0x3500,queue=0xFFFF/ -I 1000
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5. func-queue mode
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PMU collect performance statistic of one queue of PF/VF. The function id
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is BDF of PF/VF, the "queue" filter option must be set to the exact queue
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id of function.
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Example usage of perf::
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$# perf stat -a -e hns3_pmu_sicl_0/config=0x1020F,bdf=0x3500,queue=0/ -I 1000
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6. func-intr mode
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PMU collect performance statistic of one interrupt of PF/VF. The function
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id is BDF of PF/VF, the "intr" filter option must be set to the exact
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interrupt id of function.
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Example usage of perf::
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$# perf stat -a -e hns3_pmu_sicl_0/config=0x00301,bdf=0x3500,intr=0/ -I 1000
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