From owner-freebsd-current@freebsd.org Fri Jan 29 22:40:30 2021 Return-Path: Delivered-To: freebsd-current@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 643084FB700 for ; Fri, 29 Jan 2021 22:40:30 +0000 (UTC) (envelope-from yasu@utahime.org) Received: from maybe.home.utahime.org (gate.home.utahime.org [183.180.29.210]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 4DSC3K3VPHz4WfW for ; Fri, 29 Jan 2021 22:40:29 +0000 (UTC) (envelope-from yasu@utahime.org) Received: from eastasia.home.utahime.org (eastasia.home.utahime.org [192.168.174.1]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (No client certificate requested) by maybe.home.utahime.org (Postfix) with ESMTPS id 7BC7112F5A for ; Sat, 30 Jan 2021 07:40:20 +0900 (JST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=utahime.org; s=maybe2019112701; t=1611960020; bh=v+ANArBHt0wVSASA4A2Vz2MP0cblMZVyEk0kXUv1uKQ=; h=Date:To:Subject:From:In-Reply-To:References; b=Da4pdgQixU0MZUtA9MquJz1oEDu53SZpbUrsucrc3dqQpIMaraOnOVaJLewsHlXyd 5w2100vpk2OMQxGcnQIP9BJDAmhW06JlIIhWfPJtA8q2yE1KNEp4VWOSnatMJEEn77 fvrtywtZXsECSRU54qu6hXK1FS9sCHD/uUJaReASeT68NgnTiBiO1wr0U8vfPPW24/ P3X/f8Yu+vSKANBQGnAuDvAS5LC1ku+9hWJTLZoBMyp5d3icT/oroZKm2RobXlAuDR y4FAgPRAnSgG7x3tctXhVOnwrL+UhIOLc1UZD9xc2WFU+WV5Z8sPIWql4Fa4abRwQW cJG4tj/FmjYuA== Received: from localhost (rolling.home.utahime.org [192.168.174.11]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (P-384) server-digest SHA384) (No client certificate requested) by eastasia.home.utahime.org (Postfix) with ESMTPSA id 680061C9E3; Sat, 30 Jan 2021 07:40:19 +0900 (JST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.0 at eastasia.home.utahime.org Date: Sat, 30 Jan 2021 07:40:03 +0900 (JST) Message-Id: <20210130.074003.1244393857868272421.yasu@utahime.org> To: freebsd-current@freebsd.org Subject: Re: Waiting for bufdaemon From: Yasuhiro Kimura 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> X-Mailer: Mew version 6.8 on Emacs 27.1 Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4DSC3K3VPHz4WfW X-Spamd-Bar: + Authentication-Results: mx1.freebsd.org; dkim=pass header.d=utahime.org header.s=maybe2019112701 header.b=Da4pdgQi; dmarc=none; spf=pass (mx1.freebsd.org: domain of yasu@utahime.org designates 183.180.29.210 as permitted sender) smtp.mailfrom=yasu@utahime.org X-Spamd-Result: default: False [1.30 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; MV_CASE(0.50)[]; R_SPF_ALLOW(-0.20)[+a:spf-authorized.utahime.org]; TO_DN_NONE(0.00)[]; HFILTER_HELO_IP_A(1.00)[maybe.home.utahime.org]; HFILTER_HELO_NORES_A_OR_MX(0.30)[maybe.home.utahime.org]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[utahime.org:+]; NEURAL_HAM_SHORT(-1.00)[-1.000]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+]; RBL_DBL_DONT_QUERY_IPS(0.00)[183.180.29.210:from]; ASN(0.00)[asn:2519, ipnet:183.180.0.0/16, country:JP]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[utahime.org:s=maybe2019112701]; FROM_HAS_DN(0.00)[]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; DMARC_NA(0.00)[utahime.org]; PREVIOUSLY_DELIVERED(0.00)[freebsd-current@freebsd.org]; NEURAL_SPAM_MEDIUM(1.00)[1.000]; RCPT_COUNT_ONE(0.00)[1]; SPAMHAUS_ZRD(0.00)[183.180.29.210:from:127.0.2.255]; MID_CONTAINS_FROM(1.00)[]; RCVD_TLS_ALL(0.00)[]; MAILMAN_DEST(0.00)[freebsd-current] X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 29 Jan 2021 22:40:30 -0000 From: Yasuhiro Kimura 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 > 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