Re: CPU hog in vnlru and arc_prune on 13-STABLE

Reply: Juraj Lutter : "Re: CPU hog in vnlru and arc_prune on 13-STABLE"
In reply to: Juraj Lutter : "CPU hog in vnlru and arc_prune on 13-STABLE"
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From: Lexi Winter <lexi_at_le-fay.org>
Date: Fri, 01 Mar 2024 19:43:29 UTC

Juraj Lutter:
> I have a fresh (git b9880e247b26) 13.3-STABLE running in bhyve with 2 vCPU and 10G of RAM.
> 
> I’ve put some load on it (building lang/rust from ports outside poudriere, using make -j2) and the system
> started to respond very slowly.
> 
> I did break the make process and I was able to look into top where there was:
> 
>   PID USERNAME    PRI NICE   SIZE    RES STATE    C   TIME    WCPU COMMAND
>     0 root         -8    -     0B  1808K CPU1     1  35:53  99.79% kernel{arc_prune}
>    15 root         20    -     0B    16K RUN      0  34:19  99.35% vnlru

this could be [0]: "High CPU usage by arc_prune; analysis and fix".

[0] https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=275594