From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8C689C3A59E for ; Wed, 21 Aug 2019 06:42:59 +0000 (UTC) Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 6489C2087E for ; Wed, 21 Aug 2019 06:42:59 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 6489C2087E Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Received: from localhost ([::1]:44324 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i0KKg-0001d5-DP for qemu-devel@archiver.kernel.org; Wed, 21 Aug 2019 02:42:58 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]:37790) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1i0KK5-0001DI-AO for qemu-devel@nongnu.org; Wed, 21 Aug 2019 02:42:22 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1i0KK4-0000DC-0T for qemu-devel@nongnu.org; Wed, 21 Aug 2019 02:42:20 -0400 Received: from mx1.redhat.com ([209.132.183.28]:56590) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1i0KK3-0000C7-RC for qemu-devel@nongnu.org; Wed, 21 Aug 2019 02:42:19 -0400 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id B6D23C050DEC; Wed, 21 Aug 2019 06:42:17 +0000 (UTC) Received: from sirius.home.kraxel.org (ovpn-116-60.ams2.redhat.com [10.36.116.60]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8658F1001B14; Wed, 21 Aug 2019 06:42:09 +0000 (UTC) Received: by sirius.home.kraxel.org (Postfix, from userid 1000) id 54CCE16E1A; Wed, 21 Aug 2019 08:42:08 +0200 (CEST) Date: Wed, 21 Aug 2019 08:42:08 +0200 From: Gerd Hoffmann To: Philippe =?utf-8?Q?Mathieu-Daud=C3=A9?= Message-ID: <20190821064208.eckikvttpdc3zjmd@sirius.home.kraxel.org> References: <699eee57-3009-4160-a9a2-1070f92b9c20@redhat.com> <7f6e8a5c-8262-ae39-333a-e8f18b3174f0@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <7f6e8a5c-8262-ae39-333a-e8f18b3174f0@redhat.com> User-Agent: NeoMutt/20180716 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.32]); Wed, 21 Aug 2019 06:42:17 +0000 (UTC) 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 , Paolo Bonzini , John Snow Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi, > Using the default QEMU config, we build SeaBIOS to use the TSC timer: > > builds/seabios-128k/.config:CONFIG_TSC_TIMER=y > builds/seabios-256k/.config:CONFIG_TSC_TIMER=y > Do we need a cpu with TSC support to run SeaBIOS? Hmm. seabios uses pmtimer if available. isapc has no pmtimer though, so it uses TSC instead. > 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. cheers, Gerd