[LU-2624] Stop of ptlrpcd threads is long

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.4.0
• Affects Version/s: Lustre 2.2.0, Lustre 2.3.0, Lustre 2.4.0, Lustre 2.1.5
• Environment: lustre 2.1.3; bullxlinux 6.1 (based on redhat 6.1); machine with 32 CPUs
• Severity: 3

Epic

ptlrpc

• Assignee: Bruno Faccini (Inactive)
• Reporter: Gregoire Pichon

Description

The stop of ptlrpcd threads lasts more than one second per thread. On hardware with large number of cores this lead to a few minutes to unload ptlrpc module.

# lscpu | grep "^CPU(s)"
CPU(s):                32
# ps -ef | grep ptlrpcd
root      7301     2  0 10:58 ?        00:00:00 [ptlrpcd_rcv]
root      7302     2  0 10:58 ?        00:00:00 [ptlrpcd_0]
root      7303     2  0 10:58 ?        00:00:00 [ptlrpcd_1]
root      7304     2  0 10:58 ?        00:00:00 [ptlrpcd_2]
root      7305     2  0 10:58 ?        00:00:00 [ptlrpcd_3]
root      7306     2  0 10:58 ?        00:00:00 [ptlrpcd_4]
root      7307     2  0 10:58 ?        00:00:00 [ptlrpcd_5]
root      7308     2  0 10:58 ?        00:00:00 [ptlrpcd_6]
root      7309     2  0 10:58 ?        00:00:00 [ptlrpcd_7]
root      7310     2  0 10:58 ?        00:00:00 [ptlrpcd_8]
root      7311     2  0 10:58 ?        00:00:00 [ptlrpcd_9]
root      7312     2  0 10:58 ?        00:00:00 [ptlrpcd_10]
root      7313     2  0 10:58 ?        00:00:00 [ptlrpcd_11]
root      7314     2  0 10:58 ?        00:00:00 [ptlrpcd_12]
root      7315     2  0 10:58 ?        00:00:00 [ptlrpcd_13]
root      7316     2  0 10:58 ?        00:00:00 [ptlrpcd_14]
root      7317     2  0 10:58 ?        00:00:00 [ptlrpcd_15]
root      7318     2  0 10:58 ?        00:00:00 [ptlrpcd_16]
root      7319     2  0 10:58 ?        00:00:00 [ptlrpcd_17]
root      7320     2  0 10:58 ?        00:00:00 [ptlrpcd_18]
root      7321     2  0 10:58 ?        00:00:00 [ptlrpcd_19]
root      7322     2  0 10:58 ?        00:00:00 [ptlrpcd_20]
root      7323     2  0 10:58 ?        00:00:00 [ptlrpcd_21]
root      7324     2  0 10:58 ?        00:00:00 [ptlrpcd_22]
root      7325     2  0 10:58 ?        00:00:00 [ptlrpcd_23]
root      7326     2  0 10:58 ?        00:00:00 [ptlrpcd_24]
root      7327     2  0 10:58 ?        00:00:00 [ptlrpcd_25]
root      7328     2  0 10:58 ?        00:00:00 [ptlrpcd_26]
root      7329     2  0 10:58 ?        00:00:00 [ptlrpcd_27]
root      7330     2  0 10:58 ?        00:00:00 [ptlrpcd_28]
root      7331     2  0 10:58 ?        00:00:00 [ptlrpcd_29]
root      7332     2  0 10:58 ?        00:00:00 [ptlrpcd_30]
root      7333     2  0 10:58 ?        00:00:00 [ptlrpcd_31]
# time modprobe -r ptlrpc
real	1m7.204s
user	0m0.000s
sys	0m0.030s