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drp-neh-cmp012:~$ more /usr/lib/systemd/system/tdetsim.service
[Unit]
Description=SimCam Device Manager
Requires=multi-user.target
After=multi-user.target

[Service]
Type=simple
ExecStart=/usr/local/sbin/kcuSim -s -d /dev/datadev_0
ExecStartPost=/sbin/insmod /usr/local/sbin/datadev.ko cfgTxCount=4 cfgRxCount=40
96 cfgSize=0x210000 cfgMode=0x2
ExecStop=
KillMode=process
IgnoreSIGPIPE=no
StandardOutput=syslog
StandardError=inherit

[Install]
WantedBy=multi-user.target

Interrupt Coalescing

From Matt: 

The datadev driver parameter for interrupt coalescing is "cfgIrqHold".  It is the number of 200 MHz clocks that an interrupt may be delayed to allow others to be serviced together.  You can see its current setting with cat /proc/datadev_0.  It looks like the current setting limits interrupts (per pcie device) to ~20 kHz.

[weaver@drp-srcf-cmp005 ~]$ cat /proc/datadev_0

-------------- Axi Version ----------------
     Firmware Version : 0x6
           ScratchPad : 0x0
        Up Time Count : 71501
            Device ID : 0x1
             Git Hash : 0000000000000000000000000000000000000000
            DNA Value : 0x00000000000000000000000000000000
         Build String : DrpPgpIlv: Vivado v2019.1, rdsrv302 (x86_64), Built Sun 14 Jun 2020 05:50:49 PM PDT by weaver

-------------- General HW -----------------
          Int Req Count : 0
        Hw Dma Wr Index : 3634
        Sw Dma Wr Index : 3634
        Hw Dma Rd Index : 0
        Sw Dma Rd Index : 0
     Missed Wr Requests : 3530076280
       Missed IRQ Count : 5846742
         Continue Count : 0
          Address Count : 4096
    Hw Write Buff Count : 4095
     Hw Read Buff Count : 0
           Cache Config : 0x0
            Desc 128 En : 1
            Enable Ver  : 0x2010101
      Driver Load Count : 1

               IRQ Hold : 10000

HSD

• look at configured parameters using (for example) "hsdpva DAQ:LAB2:HSD:DEV06_3D:A"
• for kcu firmware that is built to use both QSFP links, the naming of the qsfp's is swapped.  i.e. the qsfp that is normally called /dev/datadev_0 is now called /dev/datadev_1
• HSD is not configured to do anything (Check the HSD config tab for no channels enabled)
• if hsd timing frames are not being received at 929kHz (status here), click TxLink Reset in XPM window.  Typically when this is an issue the receiving rate is ~20kHz.
• The HSD readoutGroup number does not match platform number in .cnf file (Check the HSD "Config" tab)
• also check that HEADERCNTL0 is incrementing in "Timing" tab of HSD cfg window.
• in hsd Timing tab timpausecnt is number of clocks we are dead
• in hsd expert window "full threshold(events)" sets threshold for hsd deadtime
• in hsd Buffer tab "fex free events" and "raw free events" are the current free events.
• in hsd status window "write fifo count" is number of timing headers waiting for HSD data to associate.
• "readcntsum" on hsd timing tab goes up when we send a transition OR L1Accepts. "trigcntsum" counts L1Accepts only.
• check kcuStatus for "locPause" non-zero (a low level pgp FIFO being full).  If this happens then:  configure hsd, clear readout, reboot drp node with KCU

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