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Please let me know the scenarios of using Portcfgportcredits and portcfglongdistance

  • 1.  Please let me know the scenarios of using Portcfgportcredits and portcfglongdistance

    Posted 02-09-2019 09:21 PM
    Please let me know portcfglong resits and portcfglongdistance what scenario's this is applied please explain
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  • 2.  Re: Please let me know the scenarios of using Portcfgportcredits and portcfglongdistance

    Posted 02-10-2019 10:16 AM

    Hello,

     

    please review adminsitration guide everything is well documented well. In case that you checked this please specify your question more.


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  • 3.  Re: Please let me know the scenarios of using Portcfgportcredits and portcfglongdistance

    Posted 02-11-2019 08:30 PM

    In one fabric we tried increasing the isl buffer credit by running c. Please find the output for the same port.

     

    portstatsshow 0
    stat_wtx 394261674938 4-byte words transmitted
    stat_wrx 350432200915 4-byte words received
    stat_ftx 1063857769 Frames transmitted
    stat_frx 953058276 Frames received
    stat_c2_frx 0 Class 2 frames received
    stat_c3_frx 953066857 Class 3 frames received
    stat_lc_rx 323 Link control frames received
    stat_mc_rx 0 Multicast frames received
    stat_mc_to 0 Multicast timeouts
    stat_mc_tx 0 Multicast frames transmitted
    tim_rdy_pri 5 Time R_RDY high priority
    tim_txcrd_z 403632 Time TX Credit Zero (2.5Us ticks)
    tim_txcrd_z_vc 0- 3: 403623 0 9 0
    tim_txcrd_z_vc 4- 7: 0 0 0 0
    tim_txcrd_z_vc 8-11: 0 0 0 0
    tim_txcrd_z_vc 12-15: 0 0 0 0
    tim_latency_vc 0- 3: 1 1 1 1
    tim_latency_vc 4- 7: 1 1 1 1
    tim_latency_vc 8-11: 1 1 1 1
    tim_latency_vc 12-15: 1 1 1 1

     

    Please find the output of porterrshow for the same port.

     

    frames enc crc crc too too bad enc disc link loss loss frjt fbsy c3timeout pcs uncor
    tx rx in err g_eof shrt long eof out c3 fail sync sig tx rx err err
    0: 1.0g 958.5m 0 0 0 0 0 0 0 39 0 0 0 0 0 0 0 0 0

     

    After increasing the buffer credit using portcfglongdistance we got 39 C3 discard error

    In this case we got 126 buffer credits using ls mode 15 KM 

    ----------------------------------------------------------------------------------------------------------------------

    In other fabric we tried the isl buffer credit by running Portcfgportcredits . Please find the output for the same port

    portstatsshow 0

    stat_wtx 597510131 4-byte words transmitted
    stat_wrx 4191102980 4-byte words received
    stat_ftx 935247078 Frames transmitted
    stat_frx 320443622 Frames received
    stat_c2_frx 0 Class 2 frames received
    stat_c3_frx 320442646 Class 3 frames received
    stat_lc_rx 873 Link control frames received
    stat_mc_rx 0 Multicast frames received
    stat_mc_to 0 Multicast timeouts
    stat_mc_tx 0 Multicast frames transmitted
    tim_rdy_pri 0 Time R_RDY high priority
    tim_txcrd_z 84974808 Time TX Credit Zero (2.5Us ticks)
    tim_txcrd_z_vc 0- 3: 0 0 26160 39433
    tim_txcrd_z_vc 4- 7: 91 84909124 0 0
    tim_txcrd_z_vc 8-11: 0 0 0 0
    tim_txcrd_z_vc 12-15: 0 0 0 0
    tim_latency_vc 0- 3: 1 1 1 1
    tim_latency_vc 4- 7: 1 1 1 1
    tim_latency_vc 8-11: 1 1 1 1
    tim_latency_vc 12-15: 1 1 1 1

     

    porterrshow 0



    frames enc crc crc too too bad enc disc link loss loss frjt fbsy c3timeout pcs
    tx rx in err g_eof shrt long eof out c3 fail sync sig tx rx err
    0: 944.7m 324.8m 0 0 0 0 0 0 0 20 0 0 0 0 0 0 0 0

     

     

    After increasing the buffer credit using Portcfgportcredits we got 20 discard error .

    In this case we got buffer credit of 166 with 5 km .

     

    Which is the effective way to configure port buffer credits

     

     

     

     


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