Experimental Physics and
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Hi all, We are experienceing some channel name anomalies in our systems.I have Wireshark sniffing our control network to monitor Channel Access packets. It's showing CA requests for channels that don't exist such as this one: Channel Access Command: Search (0x0006) Payload Size: 24 Reply: Only for Success (0x0005) Version: 13 Client Channel ID: 94 Param 2: 0x0000005e PV Name: sad:dc:d_gdr_winYo4 The channel that is being searched for, sad:dc:d_gdr_winYo4 does not exist in any of our systems, but the name is missing a prefix for a legitimate channel, and it should be gsaoi:sad:dc:d_gdr_winSizeS. This channel is referenced as an input link to a different channe (it's an ai record)l: tcs-cp-ioc> dbpr tcs:drives:odgwextent 10 ACKS: INVALID ACKT: YES ADEL: 0 ALST: 16 AOFF: 0 ASG: ASLO: 1 ASP: 0x0 BKPT: 00 DESC: Extent of ODGW window DISA: 0 DISP: 0 DISS: NO_ALARM DISV: 1 DPVT: 0x28b458 DSET: 0x28b458 DTYP: Soft Channel EGU: pixels EGUF: 0 EGUL: 0 EOFF: 0 ESLO: 1 EVNT: 0 FLNK:DB_LINK tcs:drives:odgw1x.VAL HHSV: NO_ALARM HIGH: 0 HIHI: 0 HOPR: 0 HSV: NO_ALARM HYST: 0 INIT: 0 INP:CA_LINK gsaoi:sad:dc:d_gdr_winSizeS CA NMS LALM: 16 LBRK: 0 LCNT: 0 LINR: LINEAR LLSV: NO_ALARM LOLO: 0 LOPR: 0 LOW: 0 LSET: 0x1c9c7e0 LSV: NO_ALARM MDEL: 0 MLIS: 00 00 00 00 00 00 00 00 00 00 00 00 MLOK: 01 8b c9 18 MLST: 16 NAME: tcs:drives:odgwextent NSEV: NO_ALARM NSTA: NO_ALARM ORAW: 0 PACT: 0 PBRK: 0x0 PHAS: 0 PINI: NO PPN: 0x0 PPNR: 0x0 PREC: 1 PRIO: LOW PROC: 0 PUTF: 0 RDES: 0xae1f78 ROFF: 0 RPRO: 0 RSET: 0x28ac30 RVAL: 0 SCAN: 2 second SDIS:CONSTANT 0.000000000000000e+00 SEVR: NO_ALARM SIML:CONSTANT 0.000000000000000e+00 SIMM: NO SIMS: NO_ALARM SIOL:CONSTANT 0.000000000000000e+00 SMOO: 0 SPVT: 0x1d01758 STAT: NO_ALARM SVAL: 0 TIME: 2019-07-19 15:41:03.662545919 TPRO: 0 TSE: 0 TSEL:CONSTANT UDF: 0 VAL: 16 tcs-cp-ioc> The channel requesting the value ( tcs:drives:odgwextent) does seem to be getting the correct input value from the other channel (gsaoi:sad:dc:d_gdr_winSizeS): $ caget gsaoi:sad:dc:d_gdr_winSizeS gsaoi:sad:dc:d_gdr_winSizeS 16 $ caget tcs:drives:odgwextent tcs:drives:odgwextent 16 but as can be seen from the Wireshark capture, CA is also requesting the channel with an incomplete version of its name. The channel with the bogus name (and several others) is being asked for many times per second, and we are concerned about unnecessary network traffic. For reference, we are using EPICS R3.14.12.8 with RTEMS 4.10.2 on a MVME2700 CPU. Can someone help us understand what's going on here? Thanks, -- Mike Westfall Control Systems Software Engineer
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ANJ, 19 Jul 2019 |
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