From owner-freebsd-current@freebsd.org Fri Mar 5 23:34:59 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 B440256B5B5 for ; Fri, 5 Mar 2021 23:34:59 +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 4Dskc22Pyzz3tpk for ; Fri, 5 Mar 2021 23:34:58 +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 5B4932D6F2 for ; Sat, 6 Mar 2021 08:34:53 +0900 (JST) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=utahime.org; s=maybe2019112701; t=1614987293; bh=6adkv4vUzRngrZBD1xBJSW4kGoyB/rIMb8Sx2OBo+FI=; h=Date:To:Subject:From:In-Reply-To:References; b=QOpeU55QtboAit52twYhHhnusBc+k47ee9pyCYiAVNbSIRq8g2IoTK0Fn++pzcMrj NKlwkhYXw9yWsqHl12toN7TtFYkeYWu2YJ0UBEnu2XIgKQfNNr6CX30U+XufTrkd7s 57qtK5/yT9EsIpefFo39nsuzTpr5mDc/FDIf2Io3pFPr0tf1ISXEzGCYqsBDT0g4Pa IHOa9qOUrRKJRtJ5Rw4LgpbmyC5GzPq/Cr6VEm5vhxf2nIYYK81DPBnIYZmowiITUK B3ykPUyH6vfIrdq7AlKWoHlel6hilQJqbAq6jS0V4aFrhDKTlEogeWea8lEInGRuqc wXwd+JNnvfrqQ== 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 495E02ED4A; Sat, 6 Mar 2021 08:34:52 +0900 (JST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.1 at eastasia.home.utahime.org Date: Sat, 06 Mar 2021 08:33:23 +0900 (JST) Message-Id: <20210306.083323.1112779300812727243.yasu@utahime.org> To: freebsd-current@freebsd.org Subject: Re: Waiting for bufdaemon From: Yasuhiro Kimura In-Reply-To: References: <20210128.050242.1986722766748729591.yasu@utahime.org> <20210305.160311.867123118349124334.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: 4Dskc22Pyzz3tpk X-Spamd-Bar: / Authentication-Results: mx1.freebsd.org; dkim=pass header.d=utahime.org header.s=maybe2019112701 header.b=QOpeU55Q; 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 [-0.70 / 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)[]; NEURAL_HAM_MEDIUM(-1.00)[-1.000]; 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]; 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, 05 Mar 2021 23:34:59 -0000 From: Konstantin Belousov Subject: Re: Waiting for bufdaemon Date: Fri, 5 Mar 2021 22:43:58 +0200 > My belief is that this commit helps more users than it hurts. Namely, > the VMWare and KVM users, which are majority, use fast timecounter, > comparing to the more niche hypervisors like VirtualBox. > > For you, a simple but manual workaround, setting the timecounter to > ACPI (?) or might be HPET, with a loader tunable, should do it. Then please let me know the name of it. I have experienced same situation several time. That is, I faced a problem and asked for it on ML. Then I was told to try some tunable. So I thought there may be tunable that can be used as workaround in this case. But for those who isn't familiar with kernel internal, it it quite hard to find it without knowing its name. If all tunable were listed with brief explanation in one document, then I saw it and could pick up possible candidates. But actually they are documented separately among many man pages. So the first difficulty is to find man page in which possible tunable may be explained. If the problem is releted to some device, it is most hopeful to check its man page. But in this case, even after reading the commit message, I had no idea which man page to check. --- Yasuhiro Kimura