Intermittent latency seen at host side FCP while Brocade sees buffer credit zero
Applies to
Issue
- Host latency increase intermittently
- Brocade switches see multiple ports with high buffer credit zero
portstatsshow 0
stat_wtx 56028197006651 4-byte words transmitted
stat_wrx 50686829025950 4-byte words received
...
tim_txcrd_z 406981115 Time TX Credit Zero (2.5Us ticks)
tim_txcrd_z_vc 0- 3: 0 0 406981115 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
lat_tot_pkt_vc 0- 3: 1 1 39 1
lat_tot_pkt_vc 4- 7: 1 1 1 1
lat_tot_pkt_vc 8-11: 1 1 1 1
lat_tot_pkt_vc 12-15: 1 1 1 1
lat_hi_time_vc 0- 3: 0 0 0 0
lat_hi_time_vc 4- 7: 0 0 0 0
lat_hi_time_vc 8-11: 0 0 0 0
lat_hi_time_vc 12-15: 0 0 0 0
lat_lo_time_vc 0- 3: 1 1 7148 1
lat_lo_time_vc 4- 7: 1 1 1 1
lat_lo_time_vc 8-11: 1 1 1 1
lat_lo_time_vc 12-15: 1 1 1 1
max_latency_vc 0- 3: 1 1 515 1
max_latency_vc 4- 7: 1 1 1 1
max_latency_vc 8-11: 1 1 1 1
max_latency_vc 12-15: 1 1 1 1