Re: misc/57286

[Jim Spath <jspath55%gmail.com@localhost>]

The following reply was made to PR misc/57286; it has been noted by GNATS.

From: Jim Spath <jspath55%gmail.com@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: misc/57286
Date: Thu, 6 Apr 2023 19:53:46 -0400

 I ran additional shell commands to determine why this occurs:
 
 # sysctl -w kern.maxvnodes=2000
 sysctl: kern.maxvnodes: Device busy
 
 On one system the current maxvnode count is:
 # sysctl -n kern.maxvnodes
 402626
 
 Higher values than 2,000 succeed:
 
 # sysctl -w kern.maxvnodes=402625
 kern.maxvnodes: 402626 -> 402625
 # sysctl -w kern.maxvnodes=100000
 kern.maxvnodes: 402625 -> 100000
 # sysctl -w kern.maxvnodes=50000
 kern.maxvnodes: 100000 -> 50000
 # sysctl -w kern.maxvnodes=10000
 kern.maxvnodes: 50000 -> 10000
 
 The lower limit for this system is around 4,000.
 
 # sysctl -w kern.maxvnodes=3000
 sysctl: kern.maxvnodes: Device busy
 # sysctl -w kern.maxvnodes=4000
 sysctl: kern.maxvnodes: Device busy
 # sysctl -w kern.maxvnodes=4500
 kern.maxvnodes: 5000 -> 4500
 
 Could the test determine a valid number of nodes before trying to
 lower the value?