Date: Sat, 30 Jan 2021 07:40:03 +0900 (JST) From: Yasuhiro Kimura <yasu@utahime.org> To: freebsd-current@freebsd.org Subject: Re: Waiting for bufdaemon Message-ID: <20210130.074003.1244393857868272421.yasu@utahime.org> In-Reply-To: <20210128.050242.1986722766748729591.yasu@utahime.org> References: <20210115.201030.1395690536446474720.yasu@utahime.org> <20210116.040323.136067379540977557.yasu@utahime.org> <20210128.050242.1986722766748729591.yasu@utahime.org>
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From: Yasuhiro Kimura <yasu@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@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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