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[88.21.205.47]) by smtp.gmail.com with ESMTPSA id h13sm2058742wml.45.2020.02.26.00.44.20 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 26 Feb 2020 00:44:20 -0800 (PST) Subject: Re: Sudden slowdown of ARM emulation in master To: Peter Maydell , Niek Linnenbank References: From: =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= Message-ID: Date: Wed, 26 Feb 2020 09:44:19 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: Content-Language: en-US X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] [fuzzy] X-Received-From: 207.211.31.120 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Igor Mammedov , qemu-arm , Richard Henderson , QEMU Developers , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2/26/20 9:41 AM, Peter Maydell wrote: > On Tue, 25 Feb 2020 at 23:08, Niek Linnenbank wrote: > >> Just now I was working on some small fixes for the cubieboard machine and rebasing my Allwinner H3 branches. >> While doing some testing, I noticed that suddenly the machines were much slower than before. >> I only see this happening when I rebase to this commit: >> ca6155c0f2bd39b4b4162533be401c98bd960820 ("Merge tag 'patchew/20200219160953.13771-1-imammedo@redhat.com' of https://github.com/patchew-project/qemu into HEAD") > > Yeah, I noticed a slowdown yesterday as well, but haven't tracked it down > as yet. The first thing would be to do a git bisect to try to narrow > down what commit caused it. My guess: biggest chunk of memory is the DRAM, registered as "fast RAM" by QEMU, but the SoCs provide SRAM which is supposed to be faster. Not anymore with QEMU. And Linux try to use the SRAM when possible.