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[141.239.149.160]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-1fac159686csm67502255ad.266.2024.07.01.10.25.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 01 Jul 2024 10:25:30 -0700 (PDT) Sender: Tejun Heo Date: Mon, 1 Jul 2024 07:25:27 -1000 From: Tejun Heo To: Daniel =?iso-8859-1?Q?P=2E_Berrang=E9?= Cc: Mikulas Patocka , Lai Jiangshan , Waiman Long , Mike Snitzer , Laurence Oberman , Jonathan Brassow , Ming Lei , Ondrej Kozina , Milan Broz , linux-kernel@vger.kernel.org, dm-devel@lists.linux.dev, users@lists.libvirt.org Subject: Re: dm-crypt performance regression due to workqueue changes Message-ID: References: <32fd8274-d5f-3eca-f5d2-1a9117fd8edb@redhat.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=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: Hello, On Mon, Jul 01, 2024 at 02:52:19PM +0100, Daniel P. Berrangé wrote: ... > None the less, I'd suggest that virt-manager should be a explicitly > asking for sockets=1,cores=N, as that has broader guest OS compatibility. +1. Multiple sockets is pretty uncommon and often comes with significant performance implications - e.g. if VM is also splitting memory into N nodes, that can lead to significant higher overhead during reclaim due to node imbalances and premature OOMs. If the reported topology is not real, it makes a lot more sense to keep it basic. Thanks. -- tejun