Re: kern/54727: writing a large file causes unreasonable system behaviour

[David Holland <dholland-bugs%netbsd.org@localhost>]

The following reply was made to PR kern/54727; it has been noted by GNATS.

From: David Holland <dholland-bugs%netbsd.org@localhost>
To: gnats-bugs%netbsd.org@localhost
Cc: 
Subject: Re: kern/54727: writing a large file causes unreasonable system
 behaviour
Date: Fri, 6 Dec 2019 03:42:06 +0000

 On Sun, Dec 01, 2019 at 07:00:00AM +0000, spz%NetBSD.org@localhost wrote:
  > 	running "ssh othersystem dobackup > /storage/file" generating
  >         a large file while otherwise idle, causes the system to hang
  >         (no response in 5 minutes on serial console, ddb ps shows
  >         daemons memory starved or missing) or with 
  >         "sysctl -w kern.maxvnodes=10000", pgdaemon spinning several minutes
  >         before any new program can start.
  >         "vmstat 1" shows:
  > [...]
 
 two notes:
 
 (1) mlelstv mentioned in chat the other day that all file pages were
 active (rather than inactive) and this seems broken;
 
 (2) while chasing something else related today a number of people
 found that all their vnodes were active (rather than inactive),
 probably for the same reason, and this also seems broken.
 
 
 also this problem probably should be filed as a release stopper :-(
 
 -- 
 David A. Holland
 dholland%netbsd.org@localhost