> On 1. Jul 2022, at 07:55, Matthias Petermann <mp%petermann-it.de@localhost> wrote: > > Good day, > > since some time I noticed that on several of my systems with NetBSD/amd64 9.99.97/98 after longer usage the kernel process pgdaemon completely claims a CPU core for itself, i.e. constantly consumes 100%. > The affected systems do not have a shortage of RAM and the problem does not disappear even if all workloads are stopped, and thus no RAM is actually used by application processes. > > I noticed this especially in connection with accesses to the ZFS set up on the respective machines - for example after checkout from the local CVS relic hosted on ZFS. > > Is there already a known problem or what information would have to be collected to get to the bottom of this? > > I currently have such a case online, so I would be happy to pull diagnostic information this evening/afternoon. At the moment all info I have is from top. > > Normal view: > > ``` > PID USERNAME PRI NICE SIZE RES STATE TIME WCPU CPU COMMAND > 0 root 126 0 0K 34M CPU/0 102:45 100% 100% [system] > ``` > > Thread view: > > > ``` > PID LID USERNAME PRI STATE TIME WCPU CPU NAME COMMAND > 0 173 root 126 CPU/1 96:57 98.93% 98.93% pgdaemon [system] > ``` Looks a lot like kern/55707: ZFS seems to trigger a lot of xcalls Last action proposed was to back out the patch ... -- J. Hannken-Illjes - hannken%mailbox.org@localhost
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