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Fibre Channel (SAN)

Posts: 0

Port Counters - tim_txcrd_z 4379

Hi all,

Someone know why this counters are increse?

tim_txcrd_z          4379        Time TX Credit Zero (2.5Us ticks)

Yesterday we cleaned counters and this increased today...

Below the output from switch:

silvapaulo: DCX-4S_85:FID128:admin> portstatsshow 1/42

stat_wtx             3404667158  4-byte words transmitted

stat_wrx             2404041822  4-byte words received

stat_ftx             698598426   Frames transmitted

stat_frx             294155189   Frames received

stat_c2_frx          0           Class 2 frames received

stat_c3_frx          294155189   Class 3 frames received

stat_lc_rx           0           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          4379        Time TX Credit Zero (2.5Us ticks)

tim_txcrd_z_vc  0- 3:  0           0           4379        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        

er_enc_in            0           Encoding errors inside of frames

er_crc               0           Frames with CRC errors

er_trunc             0           Frames shorter than minimum

er_toolong           0           Frames longer than maximum

er_bad_eof           0           Frames with bad end-of-frame

er_enc_out           0           Encoding error outside of frames

er_bad_os            0           Invalid ordered set

er_rx_c3_timeout     0           Class 3 receive frames discarded due to timeout

er_tx_c3_timeout     0           Class 3 transmit frames discarded due to timeout

er_c3_dest_unreach   0           Class 3 frames discarded due to destination unreachable

er_other_discard     0           Other discards

er_type1_miss        0           frames with FTB type 1 miss

er_type2_miss        0           frames with FTB type 2 miss

er_type6_miss        0           frames with FTB type 6 miss

er_zone_miss         0           frames with hard zoning miss

er_lun_zone_miss     0           frames with LUN zoning miss

er_crc_good_eof      0           Crc error with good eof

er_inv_arb           0           Invalid ARB

open                 0           loop_open

transfer             0           loop_transfer

opened               0           FL_Port opened

starve_stop          0           tenancies stopped due to starvation

fl_tenancy           0           number of times FL has the tenancy

nl_tenancy           0           number of times NL has the tenancy

zero_tenancy         0           zero tenancy



Valued Contributor
Posts: 761
Registered: ‎06-11-2010

Re: Port Counters - tim_txcrd_z 4379


That counter is incremented every time (and when I say time I want to say 2.5us period)  a frame is to be delivered but there are no free BB credits to do it. It is quite normal to find this counter increasing in ISLs. You should worry about it when this counter is dramatically increased in a short period of time, but according to you output, this is not the case.


Posts: 0

Re: Port Counters -  tim_txcrd_z  4379

Hi Guijarro,

Thanks for response, but this is not a E_port, this is a F_port!

We have another switch with same counters increasing...

These switches have old firmware version v6.3.0c and fill word parameters are in option 1!

This counters can be a problem for Host ports?



Valued Contributor
Posts: 761
Registered: ‎06-11-2010

Re: Port Counters -  tim_txcrd_z  4379

In F-ports also happens but in less manner (speacially in AG, NPV, IPT, etc devices). In your case this counter is not heavily increasing so I would not worry about it. When there is an issue, you would see er_tx_c3_timeouts in addition to tim_txcrd_z.

I would recommend you to upgrade FOS and HBA FW/driver to the latest supported release.

On the other hand, fillword has nothing to do here so dont worry about it.


Occasional Contributor
Posts: 9
Registered: ‎11-28-2012

Re: Port Counters -  tim_txcrd_z  4379

Hi Wellington,

The tim_txcrd counter on it's own, is a counter whichincreases when the port is out of buffers during it's polling cycle of every 2,5 usec.

It does not represent a port running out of buffers during the extend of impacting traffic. It would be more an indication of the port fully utilizing it's bandwidth.

For example if the port is polled when the port is transmitting the content of the last buffer it will increment, even if the port is transmitting correctly, so it will not be able to transmit.

So the tim_txcrd counter on it's own increasing should be of no concern. Together with other counters as mentioned above the tx_c3_timouts, then you need to start checking the ports.



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