From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mx10.gouders.net (mx10.gouders.net [202.61.206.94]) (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 571D925D8E7 for ; Wed, 9 Apr 2025 10:50:19 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=202.61.206.94 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744195827; cv=none; b=nKDQKj+vpeZ7Ux7/f0iIwANWz7qQdEDfrl0TgyltNA2R4mI3djdNuZRqHPWWdUnfP1ezNw920DxQvCnc48TkEQuNg/f14UD2MHvXMHYNE5gJBuFnVOXFj6UjlP8PyYuryItdzvQh0T90Q+AlnRw1csnLi7a2NLyGzFH+iMGuFAA= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1744195827; c=relaxed/simple; bh=PM0AyRSsUqDr6yCZI2UpnzigVHNUW4oNFNQ/8H7gw4Q=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version:Content-Type; b=rckGqtAb1miLOpsfOLFRSTJlWYyfrAKMoZHW1RwSKbMo0Cb+jQmGWz25y6yMD+b1pGA5W+uOiWxAz7YHGYopoCIHse5Bma5zJ7IUVZvPL0uE57ISH7BXnbClwXf2wEFDqinkrQ8gsf7kJgQktnZsheWZyPK41NA1BQ6T61AXYVA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gouders.net; spf=pass smtp.mailfrom=gouders.net; dkim=pass (1024-bit key) header.d=gouders.net header.i=@gouders.net header.b=HRM4Zk7d; arc=none smtp.client-ip=202.61.206.94 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=gouders.net Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=gouders.net Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=gouders.net header.i=@gouders.net header.b="HRM4Zk7d" Received: from localhost ([193.175.198.193]) (authenticated bits=0) by mx10.gouders.net (8.17.1.9/8.17.1.9) with ESMTPSA id 539AnKlw008265 (version=TLSv1.3 cipher=TLS_AES_256_GCM_SHA384 bits=256 verify=NO); Wed, 9 Apr 2025 12:49:20 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=gouders.net; s=gnet; t=1744195760; bh=PM0AyRSsUqDr6yCZI2UpnzigVHNUW4oNFNQ/8H7gw4Q=; h=From:To:Cc:Subject:Date; b=HRM4Zk7dch3Md6jhowa2N/GHSFhJq5XbJtPKfSa057PAdeN+UjqjBXl+y000xwoU5 IQNRO44XbFjMXQMDg/F73n6orxeexLPasNiLck1D+Ms0QAFQnTNepvlKabn2Xo5MOl QL1uBtCFtnZmqE5i+DRWA/taKH9xJTkBbRb++F2s= From: Dirk Gouders To: Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen Cc: Linux Kernel , Linux x86 Subject: AMD Ryzen 7 PRO 7735U: 8 instead of 16 CPUs? User-Agent: Gnus/5.13 (Gnus v5.13) Date: Wed, 09 Apr 2025 12:49:14 +0200 Message-ID: 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=utf-8 Content-Transfer-Encoding: quoted-printable I got new hardware and after setting up everything, I was wondering why I don't see the expected 16 CPUs in top(1) or /proc/cpuinfo... >From the AMD website [1] I read: ------------------------------------------------------------------------ Name AMD Ryzen=E2=84=A2 7 PRO 7735U ... Architecture Zen 3+ # of CPU Cores 8 ... # of Threads 16 ------------------------------------------------------------------------ But lscpu(1) shows me: ------------------------------------------------------------------------ Architecture: x86_64 CPU op-mode(s): 32-bit, 64-bit Address sizes: 48 bits physical, 48 bits virtual Byte Order: Little Endian CPU(s): 8 On-line CPU(s) list: 0-7 Vendor ID: AuthenticAMD Model name: AMD Ryzen 7 Pro 7735U with Radeon Graphics CPU family: 25 Model: 68 Thread(s) per core: 2 Core(s) per socket: 4 Socket(s): 1 ------------------------------------------------------------------------ Then, I booted a BSD livesystem (NomadBSD), looked at dmesg(1): ------------------------------------------------------------------------ # dmesg | grep SMP FreeBSD/SMP: Multiprocessor System Detected: 16 CPUs FreeBSD/SMP: 1 package(s) x 8 core(s) x 2 hardware threads ------------------------------------------------------------------------ And I installed it's lscpu(1) and that reports: ------------------------------------------------------------------------ Architecture: amd64 Byte Order: Little Endian Total CPU(s): 16 Thread(s) per core: 2 Core(s) per socket: 8 Socket(s): 1 Vendor: AuthenticAMD CPU family: 25 Model: 68 Model name: AMD Ryzen 7 Pro 7735U with Radeon Graphics=20=20= =20=20=20 ------------------------------------------------------------------------ Do I misunderstand something from the above? Best regards, Dirk [1] https://www.amd.com/en/products/processors/laptop/ryzen-pro/7000-series= /amd-ryzen-7-pro-7735u.html