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 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id CAA3CC369AB for ; Tue, 15 Apr 2025 16:29:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=PgZttnciKGhdX2jP1b0Ob/WvYsTvZsPc6bDtmCYXNlk=; b=S7yDmR8UAHOpobjkSIJI0cPO3c cpqZUEVGiVZ6Yzx5Zg3dJ+Eax1wbPww93ea/5GvxSCkHZs5iAiQPLe8Rdj/JNYBk7p/URgQnRxi/o h2xFC+B1mpY0USIc3pt+pkjM9BuB52E0VlxxkfnuLseEmSiVdf9K75MDPhhyPjQoDagL72YSs0kBB 8AK4t2TtysTlQL26fAtkewC0XlNlBH0mw5bvNqwzKpCJ5vekrs1Uy3I6THI1U0Tz8QJWANaSb/aL7 PGljsCk3MXxs0wM41D3uztOFoTUWXGJVj5Rx7dB6iTforc6AqnrfGFAbYRV9FKMIAKDXh2kHCaZyt EbHSPjFQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u4jAE-00000006Pqf-0e3T; Tue, 15 Apr 2025 16:29:34 +0000 Received: from perceval.ideasonboard.com ([213.167.242.64]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1u4iaZ-00000006K4n-3z8j for linux-arm-kernel@lists.infradead.org; Tue, 15 Apr 2025 15:52:45 +0000 Received: from pendragon.ideasonboard.com (81-175-209-231.bb.dnainternet.fi [81.175.209.231]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id DC9B5725; Tue, 15 Apr 2025 17:50:37 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1744732238; bh=xGINZiurunNqT7Sjhf4GRxno/zL+xXdahm7qTRDteUU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=ZlsxAtckn2HJvPc+WvLK7jai4kCXy66sIrWFMzm0ZD0J1IHu3LGnY9gTB9/URPu9s ZDw2Tugemhs1jtEigETtiZCjgFTzsBEFHA4es126qGhZIReagbyIKcZnWHbvtJQXUT BjzwHE+SrBs4Ynx0a4KOcc59xgMSYZig9Cl2t5d0= Date: Tue, 15 Apr 2025 18:52:39 +0300 From: Laurent Pinchart To: POPESCU Catalin Cc: Jai Luthra , Shawn Guo , "robh@kernel.org" , "krzk+dt@kernel.org" , "conor+dt@kernel.org" , "shawnguo@kernel.org" , "s.hauer@pengutronix.de" , "kernel@pengutronix.de" , "festevam@gmail.com" , "devicetree@vger.kernel.org" , "imx@lists.linux.dev" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "m.felsch@pengutronix.de" , GEO-CHHER-bsp-development , "stefan.klug@ideasonboard.com" Subject: Re: [PATCH] arm64: dts: imx8mp: add cpuidle state "cpu-pd-wait" Message-ID: <20250415155239.GH9439@pendragon.ideasonboard.com> References: <20241007134424.859467-1-catalin.popescu@leica-geosystems.com> <20250415154724.GG9439@pendragon.ideasonboard.com> MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20250415154724.GG9439@pendragon.ideasonboard.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250415_085244_129565_60D5D90C X-CRM114-Status: GOOD ( 26.63 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Apr 15, 2025 at 06:47:26PM +0300, Laurent Pinchart wrote: > Hi Catalin, > > On Tue, Apr 15, 2025 at 03:42:22PM +0000, POPESCU Catalin wrote: > > Hi Jai, > > > > This issue was already reported by Stefan. The problem is that I don't > > have a Debix board to investigate. > > The main difference b/w WFI and cpu-pd-wait is that the first doesn't > > call PSCI/TF-A. So, the issue looks to be related to some settings in > > the TF-A. > > Jai, are you using mainline U-Boot and TF-A, or a downstream version of > either (or both) ? Actually, same question for Calatin :-) I'm running mainline U-Boot 2025.01 and TF-A rel_imx_5.4.70_2.3.6 (from https://github.com/nxp-imx/imx-atf) and don't seem to experience the issue: # cat /sys/devices/system/cpu/cpu*/cpuidle/state1/disable 0 0 0 0 $ ping debix PING debix.farm.ideasonboard.com (192.168.2.230) 56(84) bytes of data. 64 bytes from debix.farm.ideasonboard.com (192.168.2.230): icmp_seq=1 ttl=64 time=1.03 ms 64 bytes from debix.farm.ideasonboard.com (192.168.2.230): icmp_seq=2 ttl=64 time=0.800 ms 64 bytes from debix.farm.ideasonboard.com (192.168.2.230): icmp_seq=3 ttl=64 time=0.935 ms 64 bytes from debix.farm.ideasonboard.com (192.168.2.230): icmp_seq=4 ttl=64 time=0.902 ms 64 bytes from debix.farm.ideasonboard.com (192.168.2.230): icmp_seq=5 ttl=64 time=0.738 ms 64 bytes from debix.farm.ideasonboard.com (192.168.2.230): icmp_seq=6 ttl=64 time=0.939 ms > > What I don't get is why I don't see this issue neither on our IMX8MP > > specific design nor on the EVK, which uses the same PHY as the Debix board. > > > > On 14/04/2025 14:07, Jai Luthra wrote: > > > On Oct 21, 2024 at 17:42:34 +0800, Shawn Guo wrote: > > >> On Mon, Oct 07, 2024 at 03:44:24PM +0200, Catalin Popescu wrote: > > >>> So far, only WFI is supported on i.MX8mp platform. Add support for > > >>> deeper cpuidle state "cpu-pd-wait" that would allow for better power > > >>> usage during runtime. This is a port from NXP downstream kernel. > > >>> > > > Since the introduction of this patch in mainline, I am facing sluggish > > > network performance with my Debix Model-A board with i.MX8mp SoC. > > > > > > The network latency jumps to >1s after almost every other packet: > > > > > > PING debix (10.0.42.5) 56(84) bytes of data. > > > 64 bytes from debix (10.0.42.5): icmp_seq=1 ttl=64 time=1008 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=2 ttl=64 time=0.488 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=3 ttl=64 time=1025 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=4 ttl=64 time=0.810 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=5 ttl=64 time=590 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=6 ttl=64 time=0.351 ms > > > ^C > > > --- debix ping statistics --- > > > 7 packets transmitted, 6 received, 14.2857% packet loss, time 6126ms > > > rtt min/avg/max/mdev = 0.351/437.416/1024.755/459.370 ms, pipe 2 > > > darkapex at freya in ~ > > > > > > If I revert the patch, or disable the deeper cpuidle state through > > > sysfs, the issue goes away. > > > > > > # echo 1 > /sys/devices/system/cpu/cpu$i/cpuidle/state1/disable > > > > > > PING debix (10.0.42.5) 56(84) bytes of data. > > > 64 bytes from debix (10.0.42.5): icmp_seq=1 ttl=64 time=0.482 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=2 ttl=64 time=2.28 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=3 ttl=64 time=2.26 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=4 ttl=64 time=0.848 ms > > > 64 bytes from debix (10.0.42.5): icmp_seq=5 ttl=64 time=0.406 ms > > > ^C > > > --- debix ping statistics --- > > > 5 packets transmitted, 5 received, 0% packet loss, time 4051ms > > > rtt min/avg/max/mdev = 0.406/1.255/2.280/0.842 ms > > > > > >>> Signed-off-by: Catalin Popescu > > >> > > >> Applied, thanks! -- Regards, Laurent Pinchart