From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx.treblig.org (mx.treblig.org [46.235.229.95]) (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 300042022D5; Fri, 18 Oct 2024 17:59:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=46.235.229.95 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729274375; cv=none; b=hhRug5zqIOSfdSzno1jmWXbVcqsP4l22WsuWzmX4JOcG4a0/YMYbUiyY8M03bmafF2muMElh7IT0DCL+ih+k39m1x4XCnV+zLVL7Ca6lrM4o6rXF5eMPfcPjbVg0YpzVO6Sg2ZfJfsZktAt1ZfzDB7Cl+mEGAUZfRLv+rTkoXW0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1729274375; c=relaxed/simple; bh=r9j7j25oHOBzRT6hWz/hG0iwhrLF5+gF3nWX+EiB48U=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=JsyIfsM7f5RwRva7ZDowt5AUuIi0HqyHQXh5Tjpmbi4pX45alT8eW4GGGCzR2ELwdQeD6AWqOlKq6+0jHEeCVrNAYyPXS3VrQxTAGgT5S4VNw95btJq7GZ/G5elskvYCm8YJ9Bd/E6y4319ebSZhMGBx3X8lXdEOdnwjBmdqJXE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=treblig.org; spf=pass smtp.mailfrom=treblig.org; dkim=pass (2048-bit key) header.d=treblig.org header.i=@treblig.org header.b=WYT6y7qJ; arc=none smtp.client-ip=46.235.229.95 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=treblig.org Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=treblig.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=treblig.org header.i=@treblig.org header.b="WYT6y7qJ" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=treblig.org ; s=bytemarkmx; h=Content-Type:MIME-Version:Message-ID:Subject:From:Date:From :Subject; bh=7Oqc+vBn3lxQjaQqKVwQ/VCImNzHkqEeRjsxwIHFjLI=; b=WYT6y7qJGSHlTmNy AytG0Gr8oiYLp9cR9LyclAGUyiVVMu5dGTTXG4tLqqMRMwQdYu5rzhT6hsQppzWcWZJfBpsc8FcUo bfHTWPQEa/21Pe3+iig6n0ospcZTpbYmVlbzEHMF7nrldCGXNTXu6DL3cq8ARRpHpDnXOgAhMWYkk 1IJc4GWelZL/fLc9p5TCBwshfZT/Lb5SOJy+sgQA1rIaX2FtP1dJvTWoHwjbcYB7/bd0Jj0AEriTh mhqN1Egy7LOVb4KIVi4IsYRHUd5ENld3wUgdRE7k/DG78/JVV3ZeNGx59/kEZYMhF6AjQF6j03hn9 /H9A68vclspJcqAnxg==; Received: from dg by mx.treblig.org with local (Exim 4.96) (envelope-from ) id 1t1rG0-00CBue-1B; Fri, 18 Oct 2024 17:59:24 +0000 Date: Fri, 18 Oct 2024 17:59:24 +0000 From: "Dr. David Alan Gilbert" To: Jens Axboe Cc: Borislav Petkov , Thomas Gleixner , the arch/x86 maintainers , LKML , "regressions@lists.linux.dev" Subject: Re: AMD zen microcode updates breaks boot Message-ID: References: <20241017141314.GDZxEbenNT6XF4jIaA@fat_crate.local> <4d4bf52a-dd91-48ad-8949-198b2ffbc9da@kernel.dk> <20241017142707.GEZxEeu3YHvnEMmd32@fat_crate.local> <20241018115857.GBZxJNgZY-NedtPrxX@fat_crate.local> <20241018124943.GDZxJZZxtwA9O9eqiU@fat_crate.local> <79296353-1fa3-458a-b055-88bc6a772180@kernel.dk> <20241018155143.GIZxKED9YcF0Jg1CWZ@fat_crate.local> 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=iso-8859-1 Content-Disposition: inline In-Reply-To: X-Chocolate: 70 percent or better cocoa solids preferably X-Operating-System: Linux/6.1.0-21-amd64 (x86_64) X-Uptime: 17:59:10 up 163 days, 5:13, 1 user, load average: 0.00, 0.00, 0.00 User-Agent: Mutt/2.2.12 (2023-09-09) * Jens Axboe (axboe@kernel.dk) wrote: > On 10/18/24 10:45 AM, Dr. David Alan Gilbert wrote: > > * Borislav Petkov (bp@alien8.de) wrote: > >> On Fri, Oct 18, 2024 at 07:30:15AM -0600, Jens Axboe wrote: > >>> At least on mine, the BIOS has an option that says something like "L3 > >>> cache as numa domain", which is on and why there's 32 nodes on that box. > >>> It's pretty handy for testing since there's a crap ton of CPUs, as it > >>> makes affinity handling easier. > >> > >> Right, so two boxes I tested with this: > >> > >> * 2 socket, a bit different microcode: > >> > >> [ 22.947525] smp: Brought up 32 nodes, 512 CPUs > >> > >> * your CPU, one socket: > >> > >> [ 26.830137] smp: Brought up 16 nodes, 255 CPUs > > > > (Probably unrelated but...) > > What happened to number 256 ? > > Quick guess, maybe iommu was off, will cap it to 255. IIRC... Ah OK. Dave > -- > Jens Axboe > > -- -----Open up your eyes, open up your mind, open up your code ------- / Dr. David Alan Gilbert | Running GNU/Linux | Happy \ \ dave @ treblig.org | | In Hex / \ _________________________|_____ http://www.treblig.org |_______/