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 60E8922A4F1; Fri, 2 May 2025 08:49:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=90.155.50.34 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746175799; cv=none; b=Z+y8VCpsM+/n6iB9Br5niXgn7iuQUYjiyM14263Fit+C69Bn6NXNxdSzHwGIIjn2imWHZVljBFarR4Rce7y8euiIrEoSUgr192jxuU6PgfTTMYXAObvY7XbV8D6edRYw/c9SElmkLIVhe2Wi3V5H2kDF0M2g/MstDnLB36m6sSo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1746175799; c=relaxed/simple; bh=/RIHaS4NyUQQQxjQHFXWDvTVPnEdyMnbBligI3FDoBY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=p+9I+ckT7NpVEIRBAgLuAHavXW7itSaH0CZhuE2g+W2uGzOHcWU9grImVVgNhusl8AYfP/pcLhGAffKupUiOuvopihCixFb6CB3fdWzBM7YsL65wpiEy8aDi9d2IPeWAnGNPNLjqAt6QpkAmU26G8h51KTOUPIdRGk1JjNvodJo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=u7QyzeB7; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="u7QyzeB7" 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=/RIHaS4NyUQQQxjQHFXWDvTVPnEdyMnbBligI3FDoBY=; b=u7QyzeB7TVJNCTciytPo75z74P WQtTb70VEpejxT7DVcvOg6ZZOdu6n02EpKo6V7uLwUhwktxLMMft13Bv35EI7Bp3HL+PRu3hR0rR1 UTjboJVNv7RCfbqx9F6DCUTOH7+Vn8fQtz9h6PfpFF/rJOLBHOH+eLzry3JP/GaNQsQgPPhaifVXd qZvZWuN7PKe1qMxaas3Lpckh8vWUsOa5EY2zirXz4/x9vlBuh9DKGguelIB+MogyFTlu0pRYZwWHb v3iZLc2EH9JvIvKWi6gCQswYItaRisDb3JX6dIuFQLkBZqYU0PBo1rmikHgT0cxvT28wz5SjlasLl lV/4w/jg==; Received: from 77-249-17-252.cable.dynamic.v4.ziggo.nl ([77.249.17.252] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1uAm4g-0000000B7ur-3a56; Fri, 02 May 2025 08:48:52 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 0F40F3001D4; Fri, 2 May 2025 10:48:45 +0200 (CEST) Date: Fri, 2 May 2025 10:48:44 +0200 From: Peter Zijlstra To: "Prundeanu, Cristian" Cc: K Prateek Nayak , "Mohamed Abuelfotoh, Hazem" , "Saidi, Ali" , Benjamin Herrenschmidt , "Blake, Geoff" , "Csoma, Csaba" , "Doebel, Bjoern" , Gautham Shenoy , Swapnil Sapkal , Joseph Salisbury , Dietmar Eggemann , Ingo Molnar , Borislav Petkov , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-tip-commits@vger.kernel.org" , "x86@kernel.org" Subject: Re: EEVDF regression still exists Message-ID: <20250502084844.GT4198@noisy.programming.kicks-ass.net> References: <20250429213817.65651-1-cpru@amazon.com> <20250429215604.GE4439@noisy.programming.kicks-ass.net> <82DC7187-7CED-4285-85FC-7181688CD873@amazon.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: On Thu, May 01, 2025 at 04:16:07PM +0000, Prundeanu, Cristian wrote: > (Please keep in mind that the target isn't to get SCHED_BATCH to the same > level as 6.5-default; it's to resolve the regression from 6.5-default to > 6.6+ default, and from 6.5-SCHED_BATCH to 6.6+ SCHED_BATCH). No, the target definitely is not to make 6.6+ default match 6.5 default. The target very much is getting you performance similar to the 6.5 default that you were happy with with knobs we can live with.