Waiting for bufdaemon
Yasuhiro Kimura
yasu at utahime.org
Fri Jan 29 22:40:30 UTC 2021
From: Yasuhiro Kimura <yasu at utahime.org>
Subject: Re: Waiting for bufdaemon
Date: Thu, 28 Jan 2021 05:02:42 +0900 (JST)
> It took for a while to investigate, but according to the result of
> bisect following commit is the source of problem in my case.
>
> ----------------------------------------------------------------------
> commit 84eaf2ccc6a
> Author: Konstantin Belousov <kib at FreeBSD.org>
> Date: Mon Dec 21 19:02:31 2020 +0200
>
> x86: stop punishing VMs with low priority for TSC timecounter
>
> I suspect that virtualization techniques improved from the time when we
> have to effectively disable TSC use in VM. For instance, it was reported
> (complained) in https://github.com/JuliaLang/julia/issues/38877 that
> FreeBSD is groundlessly slow on AWS with some loads.
>
> Remove the check and start watching for complaints.
>
> Reviewed by: emaste, grehan
> Discussed with: cperciva
> Sponsored by: The FreeBSD Foundation
> Differential Revision: https://reviews.freebsd.org/D27629
> ----------------------------------------------------------------------
>
> I confirmed the problem still happens with 5c325977b11 but reverting
> above commit fixes it.
I submitted this problem to Bugzilla.
Timeout of bufdaemon happens at shutdown time with -CURRENT amd64 and VirtulaBox VM
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253087
---
Yasuhiro Kimura
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