[lustre-discuss] read performance and inode_permission

Thomas Roth t.roth at gsi.de
Wed Jan 22 04:24:28 PST 2020

Dear all,

on my quiet test system, first I clear the llite.*.stats,
lctl set_param llite.hebetest*.stats=0, then I start reading from a 22k-files directory with 'ls -l'.

After ~20 sec, I get

lctl get_param llite.hebetest*.stats
snapshot_time             1579695320.008491088 secs.nsecs
open                      1 samples [regs]
close                     1 samples [regs]
readdir                   2 samples [regs]
getattr                   660 samples [regs]
alloc_inode               129 samples [regs]
getxattr                  1321 samples [regs]
getxattr_hits             1 samples [regs]
inode_permission          3960 samples [regs]

Basically the only counter that increases quickly is the inode_permission value.
Is this the expected behavior?


Thomas Roth
Department: Informationstechnologie
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