From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.7 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 55853C433E0 for ; Thu, 11 Feb 2021 20:26:19 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0379764DDB for ; Thu, 11 Feb 2021 20:26:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231758AbhBKU0G (ORCPT ); Thu, 11 Feb 2021 15:26:06 -0500 Received: from wnew1-smtp.messagingengine.com ([64.147.123.26]:60879 "EHLO wnew1-smtp.messagingengine.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230039AbhBKUYJ (ORCPT ); Thu, 11 Feb 2021 15:24:09 -0500 X-Greylist: delayed 96500 seconds by postgrey-1.27 at vger.kernel.org; Thu, 11 Feb 2021 15:24:08 EST Received: from compute4.internal (compute4.nyi.internal [10.202.2.44]) by mailnew.west.internal (Postfix) with ESMTP id 7ED4C5F9; Thu, 11 Feb 2021 15:23:17 -0500 (EST) Received: from imap2 ([10.202.2.52]) by compute4.internal (MEProxy); Thu, 11 Feb 2021 15:23:18 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=fastmail.fm; h= mime-version:message-id:in-reply-to:references:date:from:to:cc :subject:content-type:content-transfer-encoding; s=fm2; bh=OoM33 ZaM11xFA9cPWmaarY2HSn14dliF5OMriTeEoi8=; b=HKq2JjA9WKYxUfD2FuNzW vlH2KsQDy9hQODjhtYmVD3okGegwuGRZlGIOumL8MQEaWONSAa39PI5W/HZuj/mc UwF4ilQpyvoayjY9uKxhFaMhMLxcWbtHSWEMhc8xM84YHK8UuSU3MXL92W+oZwYk rplOnjH66oJvi6UDkYtYBoMO2ZzywmalC1/WRAIJWdDXm+LfU9B9gZ17lYQma6Og W9qjS9Scr8VK3h06TFSWQq0zu/Z8lRTEWjELYT3omuLflkgMK5n9C4+SFosxWXjZ AtTbQMp1dIyE9iwPehU9IAW9tENaGjYZqm5L94Y5xiEAouXwlKLvffQrJm4eTI62 Q== DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d= messagingengine.com; h=cc:content-transfer-encoding:content-type :date:from:in-reply-to:message-id:mime-version:references :subject:to:x-me-proxy:x-me-proxy:x-me-sender:x-me-sender :x-sasl-enc; s=fm2; bh=OoM33ZaM11xFA9cPWmaarY2HSn14dliF5OMriTeEo i8=; b=ix16WujyMqSeZRW6QvPVtjJ+Jt6ZMAHWtDlOaHwReGpLYMPYL7l7uz/sL hJKDFkqfPirAoMla7cFJpR4uVzBIp2v9J91lqY8du2na4xri+9fatAp/68nYKUmn goqmuZXYBQWx2V5NlB6s6ueoJpE9hTIFNuCR8AHIwdQFL2mugnvoz9KDW3WWi/Ln b7TkFoCZ6nnzXT5VXkkLZfqSl4eQ25nVtecvZ73Y5pb5mIy+X2aDtUrUj7N3DLPO 5nMZGCiGb0lRizkbaROOSuZvgwvxEVzW/Y1Nhim/Hct/u8qA725ggNiaNZrW0/ai nyh4/+xfZjT+0mESH0iiyTFFloXkQ== X-ME-Sender: X-ME-Proxy-Cause: gggruggvucftvghtrhhoucdtuddrgeduledrheelgddufeehucetufdoteggodetrfdotf fvucfrrhhofhhilhgvmecuhfgrshhtofgrihhlpdfqfgfvpdfurfetoffkrfgpnffqhgen uceurghilhhouhhtmecufedttdenucesvcftvggtihhpihgvnhhtshculddquddttddmne cujfgurhepofgfggfkjghffffhvffutgfgsehtqhertderreejnecuhfhrohhmpehnnhgv thcuoehnnhgvthesfhgrshhtmhgrihhlrdhfmheqnecuggftrfgrthhtvghrnhepueegke dvheehveehteeiteduleejvddvtdeivedvueekjefgueehffeuleeugeeunecuvehluhhs thgvrhfuihiivgeptdenucfrrghrrghmpehmrghilhhfrhhomhepnhhnvghtsehfrghsth hmrghilhdrfhhm X-ME-Proxy: Received: by mailuser.nyi.internal (Postfix, from userid 501) id 2F396A00060; Thu, 11 Feb 2021 15:23:15 -0500 (EST) X-Mailer: MessagingEngine.com Webmail Interface User-Agent: Cyrus-JMAP/3.5.0-alpha0-141-gf094924a34-fm-20210210.001-gf094924a Mime-Version: 1.0 Message-Id: <1ad78446-4a40-4c3e-8680-6dbf19616515@www.fastmail.com> In-Reply-To: <20210211195559.n2j4jnchl2ho54mg@pali> References: <20210209225630.mdwnzkvnaz3r4blt@pali> <20210210002619.43104a9b@kernel.org> <1cd0c2ee-aa3a-4da2-9c0c-57cc5a1dad49@www.fastmail.com> <20210210092339.qy6wwuq6qr5m2ozr@pali> <20210210180322.rlfxdussqhejqpo6@pali> <966f50f2-68b2-4d4f-85f0-396df112c0f4@www.fastmail.com> <20210211195559.n2j4jnchl2ho54mg@pali> Date: Thu, 11 Feb 2021 12:22:52 -0800 From: nnet To: =?UTF-8?Q?Pali_Roh=C3=A1r?= Cc: =?UTF-8?Q?Marek_Beh=C3=BAn?= , a.heider@gmail.com, andrew@lunn.ch, gerald@gk2.net, gregory.clement@bootlin.com, kostap@marvell.com, linux-arm-kernel@lists.infradead.org, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org, luka.perkov@sartura.hr, miquel.raynal@bootlin.com, mturquette@baylibre.com, rmk+kernel@armlinux.org.uk, sboyd@kernel.org, tmn505@gmail.com, vladimir.vid@sartura.hr Subject: =?UTF-8?Q?Re:_[PATCH_mvebu_v2_00/10]_Armada_37xx:_Fix_cpufreq_changing_b?= =?UTF-8?Q?ase_CPU_speed_to_800_MHz_from_1000_MHz?= Content-Type: text/plain;charset=utf-8 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, Feb 11, 2021, at 11:55 AM, Pali Roh=C3=A1r wrote: > On Wednesday 10 February 2021 11:08:59 nnet wrote: > > On Wed, Feb 10, 2021, at 10:03 AM, Pali Roh=C3=A1r wrote: > > > > > Hello! Could you please enable userspace governor during kerne= l > > > > > compilation? > > > > >=20 > > > > > CONFIG_CPU_FREQ_GOV_USERSPACE=3Dy > > > > >=20 > > > > > It can be activated via command: > > > > >=20 > > > > > echo userspace > /sys/devices/system/cpu/cpufreq/policy0/s= caling_governor > > > > >=20 > > > > > After that you can "force" CPU frequency to specific value, e.= g.: > > > > >=20 > > > > > echo 1000000 > /sys/devices/system/cpu/cpufreq/policy0/sca= ling_setspeed > > > > >=20 > > > > > I need to know which switch (from --> to freq) cause this syst= em hang. > > > > >=20 > > > > > This patch series (via MIN_VOLT_MV_FOR_L0_L1_1GHZ) is fixing o= nly > > > > > switching from 500 MHz to 1000 MHz on 1 GHz variant. As only t= his switch > > > > > is causing issue. > > > > >=20 > > > > > I have used following simple bash script to check that switchi= ng between > > > > > 500 MHz and 1 GHz is stable: > > > > >=20 > > > > > while true; do > > > > > echo 1000000 > /sys/devices/system/cpu/cpufreq/policy0= /scaling_setspeed; > > > > > echo 500000 > /sys/devices/system/cpu/cpufreq/policy0/= scaling_setspeed; > > > > > echo 1000000 > /sys/devices/system/cpu/cpufreq/policy0= /scaling_setspeed; > > > > > echo 500000 > /sys/devices/system/cpu/cpufreq/policy0/= scaling_setspeed; > > > > > done > > > >=20 > > > > echo userspace | tee /sys/devices/system/cpu/cpufreq/policy0/sca= ling_governor > > > > while true; do > > > > echo 1200000 | tee /sys/devices/system/cpu/cpufreq/policy0/sca= ling_setspeed; > > > > echo 600000 | tee /sys/devices/system/cpu/cpufreq/policy0/scal= ing_setspeed; > > > > done > > > >=20 > > > > >> +#define MIN_VOLT_MV_FOR_L0_L1_1GHZ 1108 > > > >=20 > > > > With 1108 I get a freeze within a minute. The last output to std= out is 600000. > > > >=20 > > > > With 1120 it takes a few minutes. > > > >=20 > > > > With any of 1225, 1155, 1132 the device doesn't freeze over the = full 5 minute load test. > > > >=20 > > > > I'm using ondemand now with the above at 1132 without issue so f= ar. > > >=20 > > > Great, thank you for testing! > > >=20 > > > Can you check if switching between any two lower frequencies 20000= 0 > > > 300000 600000 is stable? > >=20 > > This is stable using 1132 mV for MIN_VOLT_MV_FOR_L0_L1_1GHZ: > >=20 > > while true; do > > # down > > echo 1200000 | tee /sys/devices/system/cpu/cpufreq/policy0/scaling= _setspeed; > ... >=20 > Hello! >=20 > Could you please re-run test without tee, in form as I have shown abov= e? > UART is slow and printing something to console adds delay which decrea= se > probability that real issue is triggered as this is timing issue. The test was done over SSH. > Also please do tests just between two frequencies in loop as I observe= d > that switching between more decreased probability to hit issue. > > > > echo userspace | tee /sys/devices/system/cpu/cpufreq/policy0/sca= ling_governor > > > > while true; do > > > > echo 1200000 | tee /sys/devices/system/cpu/cpufreq/policy0/sca= ling_setspeed; > > > > echo 600000 | tee /sys/devices/system/cpu/cpufreq/policy0/scal= ing_setspeed; > > > > done The first test ^ switched between 600 MHz and 1.2 GHz. > The real issue for 1 GHz variant of A3720 is only when doing switch fr= om > 500 MHz to 1 GHz. So could you try to do some tests also without > changing MIN_VOLT_MV_FOR_L0_L1_1GHZ and switching just between non-1.2= > frequencies (to verify that on 1.2 GHz variant it is also from 600 MHz= > to 1.2 GHz)? With 1108 mV and switching between 600 MHz and 1.2GHz, I always saw a fr= eeze within a minute. 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<20210210002619.43104a9b@kernel.org> <1cd0c2ee-aa3a-4da2-9c0c-57cc5a1dad49@www.fastmail.com> <20210210092339.qy6wwuq6qr5m2ozr@pali> <20210210180322.rlfxdussqhejqpo6@pali> <966f50f2-68b2-4d4f-85f0-396df112c0f4@www.fastmail.com> <20210211195559.n2j4jnchl2ho54mg@pali> Date: Thu, 11 Feb 2021 12:22:52 -0800 From: nnet To: =?UTF-8?Q?Pali_Roh=C3=A1r?= Subject: =?UTF-8?Q?Re:_[PATCH_mvebu_v2_00/10]_Armada_37xx:_Fix_cpufreq_changing_b?= =?UTF-8?Q?ase_CPU_speed_to_800_MHz_from_1000_MHz?= X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210211_152324_010444_04138C42 X-CRM114-Status: GOOD ( 22.21 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: =?UTF-8?Q?Marek_Beh=C3=BAn?= , andrew@lunn.ch, luka.perkov@sartura.hr, sboyd@kernel.org, gregory.clement@bootlin.com, a.heider@gmail.com, linux-kernel@vger.kernel.org, vladimir.vid@sartura.hr, mturquette@baylibre.com, rmk+kernel@armlinux.org.uk, tmn505@gmail.com, gerald@gk2.net, miquel.raynal@bootlin.com, kostap@marvell.com, linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: base64 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org T24gVGh1LCBGZWIgMTEsIDIwMjEsIGF0IDExOjU1IEFNLCBQYWxpIFJvaMOhciB3cm90ZToKPiBP biBXZWRuZXNkYXkgMTAgRmVicnVhcnkgMjAyMSAxMTowODo1OSBubmV0IHdyb3RlOgo+ID4gT24g V2VkLCBGZWIgMTAsIDIwMjEsIGF0IDEwOjAzIEFNLCBQYWxpIFJvaMOhciB3cm90ZToKPiA+ID4g PiA+IEhlbGxvISBDb3VsZCB5b3UgcGxlYXNlIGVuYWJsZSB1c2Vyc3BhY2UgZ292ZXJub3IgZHVy aW5nIGtlcm5lbAo+ID4gPiA+ID4gY29tcGlsYXRpb24/Cj4gPiA+ID4gPiAKPiA+ID4gPiA+ICAg ICBDT05GSUdfQ1BVX0ZSRVFfR09WX1VTRVJTUEFDRT15Cj4gPiA+ID4gPiAKPiA+ID4gPiA+IEl0 IGNhbiBiZSBhY3RpdmF0ZWQgdmlhIGNvbW1hbmQ6Cj4gPiA+ID4gPiAKPiA+ID4gPiA+ICAgICBl 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