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([2001:b07:6468:f312:56e1:adff:fed9:caf0]) by smtp.gmail.com with ESMTPSA id l5sm2141438wmj.4.2019.08.21.00.45.33 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 21 Aug 2019 00:45:34 -0700 (PDT) To: Gerd Hoffmann , =?UTF-8?Q?Philippe_Mathieu-Daud=c3=a9?= References: <699eee57-3009-4160-a9a2-1070f92b9c20@redhat.com> <7f6e8a5c-8262-ae39-333a-e8f18b3174f0@redhat.com> <20190821064208.eckikvttpdc3zjmd@sirius.home.kraxel.org> From: Paolo Bonzini Openpgp: preference=signencrypt Message-ID: <6206c058-8fa6-2a19-b76b-dcb5fa260e56@redhat.com> Date: Wed, 21 Aug 2019 09:45:32 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190821064208.eckikvttpdc3zjmd@sirius.home.kraxel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] Regression with floppy drive controller 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: Eduardo Habkost , Alex , seabios@seabios.org, QEMU Developers , Nikolay Nikolov , John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 21/08/19 08:42, Gerd Hoffmann wrote: >> So we should use '-cpu Conroe' or '-cpu core2duo' minimum? > -cpu Conroe for -M isapc is kida silly though ... > > Maybe we should simply build seabios with CONFIG_TSC_TIMER=n ? > > Using the TSC in a virtual machine is problematic anyway, the > calibration can be _way_ off on a loaded host, this is why seabios > prefers the (fixed frequency) pmtimer. Yeah, that falls back to the PIT which is a good enough source for SeasBIOS's needs (1 MHz, one third of the pmtimer). It overflows a bit too easily but it shouldn't be a big deal for users of isapc. Paolo