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Received: from MN0PR12MB6101.namprd12.prod.outlook.com (2603:10b6:208:3cb::10) by SJ2PR12MB8739.namprd12.prod.outlook.com (2603:10b6:a03:549::10) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.7091.26; Wed, 13 Dec 2023 19:26:26 +0000 Received: from MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::83d7:9c4f:4d9b:1f2a]) by MN0PR12MB6101.namprd12.prod.outlook.com ([fe80::83d7:9c4f:4d9b:1f2a%5]) with mapi id 15.20.7091.022; Wed, 13 Dec 2023 19:26:26 +0000 Message-ID: <657c0ca3-244f-47ff-940a-105c0651eeac@amd.com> Date: Wed, 13 Dec 2023 13:26:22 -0600 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/2] wifi: mt76: mt7921: Disable powersaving by default Content-Language: en-US To: Kalle Valo Cc: Felix Fietkau , Lorenzo Bianconi , Ryder Lee , Shayne Chen , Sean Wang , Matthias Brugger , AngeloGioacchino Del Regno , Deren Wu , Ming Yen Hsieh , Ben Greear , "open list:MEDIATEK MT76 WIRELESS LAN DRIVER" , "open list:ARM/Mediatek SoC support" , "moderated list:ARM/Mediatek SoC support" , Sultan Alsawaf References: <20231212090852.162787-1-mario.limonciello@amd.com> <874jgmnud8.fsf@kernel.org> From: Mario Limonciello In-Reply-To: <874jgmnud8.fsf@kernel.org> Content-Type: text/plain; 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In the past 802.11 Power Save Mode was > challenging due to badly behaving APs. But nowadays with so many mobile > devices in the market I would assume that APs work a lot better. It > would be best to investigate the issues in detail and try to fix them in > mt76, assuming the bugs are in mt76 driver or firmware. In my case I could reproduce the behavior on my Unifi access points. I've got a few that devices could roam between. I also happen to have a laptop on my desk with a WCN6855 that behaves just fine with those same APs. The other people with problems I've asked to come to this thread to share more about their devices. > >> It's also reported that the powersaving feature doesn't provide an >> ample enough savings to justify being enabled by default with these >> issues. > > Any numbers or how was this concluded? It was just a data point in the original patch from Sultan (who is on CC). I haven't corroborated it myself. Once I saw that other kernel drivers like iwlwifi are also "defaulting" to off with a module parameter I figured it made sense to bring that for discussion. > >> Introduce a module parameter that would control the power saving >> behavior. Set it to default as disabled. This mirrors what some other >> WLAN drivers like iwlwifi do. > > We have already several ways to control 802.11 power save mode: > > * NL80211_CMD_SET_POWER_SAVE (for example used by 'iw set power_save') I'll experiment with an unpatched kernel just undoing this from here to see if it alone improves things. > > * CONFIG_CFG80211_DEFAULT_PS (for kernel level default) > > * WIPHY_FLAG_PS_ON_BY_DEFAULT (for the driver to control the default setting) > > Adding module parameters as a fourth method sounds confusing so not > really a fan of this. And the bar is quite high for adding new module > parameters anyway. > Should we also discuss removing the iwlwifi one then too perhaps? Seems incongruent to offer it for some drivers but not others.