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 9AAE92D3EF2 for ; Mon, 2 Feb 2026 10:51:53 +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=1770029516; cv=none; b=KknFj9C8zUaQEv1yMmGIrYWkuc4WIP5nvfzFSXezcMSeZivKHC6LSfy7ug6Fc0FD11BgDGX7JuYOBP/lZhLV9pL70FoYTutQ8Xr3ynY904+qdfmrck8FUxT/QD6OA7PTV8Jl71QThvnONQZvcuF/o1uG0my8tX/Mcof7tNx2sfw= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1770029516; c=relaxed/simple; bh=e3iTnOnr2XenNfGM6n2fWUOUL5Av3Ge4TWNXtk1GLaA=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=P0lyeJE3fg2LVZSOsyOpDwO6NMS2DuR7FcZ5M9sCJfqby8XHSlwr+3TFH98yObVKZOYOKZ5wu8xMQlWlBttpnA8bwmDfyesfN7iOdXLOhV/eY/TmAuypXS7dr/UH3gtmtKFIo/e3WRpG1EmdDDxa6hPc0VXYRQG+GcuNPk24AQU= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (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=Wx1CJDww; arc=none smtp.client-ip=90.155.50.34 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (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="Wx1CJDww" 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=JBBg5pg0hxbmZsavOFTIGMHM+fXr4LOsNOzweAfbiPs=; b=Wx1CJDwwvEuJL0r2Ss5vmVqLsr BFWSu6BtcAL6qiRHLJywE5LwGhB8VCoMQ4rM+KyPuKE6/H1uLn9za+3eIjkHZvoIfTw6mb1HS8Kb2 Odn8BbbMA+2hnHl8mYNNs4kDK9mddeUg1Xr2LGPdpM2cvSniDXEjN+3LQbXv/0ECtx2XXlRFZ3M11 PCIGduEfroW7KBeemCMBye3CAQf0gcqpoWHrCOPEKIRtQBRpC1xv5iRNBTj5stBp1Eu2X00E6YC// xsBIRy+emzXczDLYW2UWwJJRldOzICaNapOSs7VbV7NmJm5HMxsmQz3kyvWWDQCwrKEhXCH1bTknh MIQ7RHAQ==; Received: from 2001-1c00-8d85-5700-266e-96ff-fe07-7dcc.cable.dynamic.v6.ziggo.nl ([2001:1c00:8d85:5700:266e:96ff:fe07:7dcc] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.98.2 #2 (Red Hat Linux)) id 1vmrWz-0000000GNFy-2jGz; Mon, 02 Feb 2026 10:51:45 +0000 Received: by noisy.programming.kicks-ass.net (Postfix, from userid 1000) id 8E85F303031; Mon, 02 Feb 2026 11:51:44 +0100 (CET) Date: Mon, 2 Feb 2026 11:51:44 +0100 From: Peter Zijlstra To: "Mohamed Abuelfotoh, Hazem" Cc: Mario Roy , Chris Mason , Joseph Salisbury , Adam Li , Josh Don , mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, vschneid@redhat.com, linux-kernel@vger.kernel.org Subject: Re: [PATCH 4/4] sched/fair: Proportional newidle balance Message-ID: <20260202105144.GC1282955@noisy.programming.kicks-ass.net> References: <20251107160645.929564468@infradead.org> <20251107161739.770122091@infradead.org> <8760001e-0274-454c-a4e4-1f38a9695b88@gmail.com> <3ef2a178-db96-4a2c-9e74-44ba81bef030@amazon.com> <20260127084412.GV171111@noisy.programming.kicks-ass.net> <20260129091937.GY166857@noisy.programming.kicks-ass.net> <683b4860-1076-43b8-8fb9-ca8ac26cd8f4@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: <683b4860-1076-43b8-8fb9-ca8ac26cd8f4@amazon.com> On Fri, Jan 30, 2026 at 01:16:52PM +0000, Mohamed Abuelfotoh, Hazem wrote: > The main difference between Intel based c7i.4xlarge vs AMD based c7a.4xlarge > is that on Intel we have HT enabled so the instance has 16 vCPU which are > really 8 Physical cores with HT enabled. On AMD the VM comes with 16 > physical cores with no HT so it has 2 CCDs while on Intel we have a single > L3 cache. I am also adding the output of lscpu on both instances to clarify > architectural discrepancies between both. OK, that clarifies. How does the NI_RATE patch work for you? https://lkml.kernel.org/r/20260127151748.GA1079264@noisy.programming.kicks-ass.net