From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from casper.infradead.org (casper.infradead.org [90.155.50.34]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id F22CE1DDE3 for ; Mon, 31 Jul 2023 21:15:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=8Z0bnX+zfeyn+xeBGa8nfbsyJ1d05F9zNyCvh1HSV9w=; b=n40PUItnguJa/y82nltY7Rc44c +JlbSn6ruHARFqpzY2jyIWVoWeQAf+RLrBocwqvKvSmdycbPKFNJoD/cT8kWhIwk4tzm3aw1MkNq0 Yq8Do9CYvKeDskBbOWCUbd8bnENCsN0g5AxUDspkPTzjqvANZ1ukB0YSgF4CjWY5a3YeT+/Jl3yWa dGwnZFPC9SuESSDeUV/WnaH05c711yYFDAZQEAt5jYD7I+k3M7wvXkp5fP4zIRtRaYYEQGMHksZhr jvyuCsqxhnNBiVKMxqoW9Ssk76Ky1w59zFSb+jZJkT+dojcWl5BBd/byXawMq8xZEeVHm+j3aQq4e bPuQIEtg==; Received: from j130084.upc-j.chello.nl ([24.132.130.84] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1qQaEY-003rwv-Bn; Mon, 31 Jul 2023 21:15:18 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (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 noisy.programming.kicks-ass.net (Postfix) with ESMTPS id 919023002CE; Mon, 31 Jul 2023 23:15:17 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id 7B21620D70602; Mon, 31 Jul 2023 23:15:17 +0200 (CEST) Date: Mon, 31 Jul 2023 23:15:17 +0200 From: Peter Zijlstra To: Guenter Roeck Cc: Roy Hopkins , Joel Fernandes , paulmck@kernel.org, Pavel Machek , Greg Kroah-Hartman , stable@vger.kernel.org, patches@lists.linux.dev, linux-kernel@vger.kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, shuah@kernel.org, patches@kernelci.org, lkft-triage@lists.linaro.org, jonathanh@nvidia.com, f.fainelli@gmail.com, sudipm.mukherjee@gmail.com, srw@sladewatkins.net, rwarsow@gmx.de, conor@kernel.org, rcu@vger.kernel.org, Ingo Molnar Subject: Re: scheduler problems in -next (was: Re: [PATCH 6.4 000/227] 6.4.7-rc1 review) Message-ID: <20230731211517.GA51835@hirez.programming.kicks-ass.net> References: <2cfc68cc-3a2f-4350-a711-ef0c0d8385fd@paulmck-laptop> <3da81a5c-700b-8e21-1bde-27dd3a0b8945@roeck-us.net> <20230731141934.GK29590@hirez.programming.kicks-ass.net> <20230731143954.GB37820@hirez.programming.kicks-ass.net> <20230731145232.GM29590@hirez.programming.kicks-ass.net> <7ff2a2393d78275b14ff867f3af902b5d4b93ea2.camel@suse.de> <20230731161452.GA40850@hirez.programming.kicks-ass.net> Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Mon, Jul 31, 2023 at 09:34:29AM -0700, Guenter Roeck wrote: > > Ha!, I was poking around the same thing. My hack below seems to (so far, > > <20 boots) help things. > > > > So, dumb question: > How comes this bisects to "sched/fair: Remove sched_feat(START_DEBIT)" ? That commit changes the timings of things; dumb luck otherwise.