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AJvYcCXyC1ftbo+Erc+h529jzc9lTd0pDCrxdyXDB2tizfluegs254iZ0x5qvBaN4TWKCaiYOi404VUZo2ifa04=@vger.kernel.org X-Gm-Message-State: AOJu0YyvJbQnRxue9lzZyGzqRuXNSRnLVnJ/b72v26yRmtz+eAOzG2Sl 6BWEEcjXnj5VuArdvabsUXKxIkHTRl8a9lK3JIdoiVVWz6/ZOZ5ipN153lFSbgk= X-Google-Smtp-Source: AGHT+IGRZ5eg+vk3mqFXMeZHbFvptacsGMvZAkLKGH1anWYrHQLxW0thEDoHSVJdXnmUIcdGae9biQ== X-Received: by 2002:a05:6602:2b8d:b0:82c:e4e1:2e99 with SMTP id ca18e2360f4ac-83aba64bf11mr384868939f.11.1729270057395; Fri, 18 Oct 2024 09:47:37 -0700 (PDT) Received: from [192.168.1.116] ([96.43.243.2]) by smtp.gmail.com with ESMTPSA id 8926c6da1cb9f-4dc10c4efb1sm487582173.155.2024.10.18.09.47.36 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 18 Oct 2024 09:47:36 -0700 (PDT) Message-ID: Date: Fri, 18 Oct 2024 10:47:35 -0600 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: AMD zen microcode updates breaks boot To: "Dr. David Alan Gilbert" , Borislav Petkov Cc: Thomas Gleixner , the arch/x86 maintainers , LKML , "regressions@lists.linux.dev" References: <20241017100257.GAZxDg0VqDAesee00m@fat_crate.local> <3400cf0b-85ca-4ec2-a8a0-c9d75889d573@kernel.dk> <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> Content-Language: en-US From: Jens Axboe In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit 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... -- Jens Axboe