From owner-svn-src-stable-10@FreeBSD.ORG Mon Mar 30 07:11:50 2015 Return-Path: Delivered-To: svn-src-stable-10@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [8.8.178.115]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by hub.freebsd.org (Postfix) with ESMTPS id 9DC2CD06; Mon, 30 Mar 2015 07:11:50 +0000 (UTC) Received: from svn.freebsd.org (svn.freebsd.org [IPv6:2001:1900:2254:2068::e6a:0]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 8843FF09; Mon, 30 Mar 2015 07:11:50 +0000 (UTC) Received: from svn.freebsd.org ([127.0.1.70]) by svn.freebsd.org (8.14.9/8.14.9) with ESMTP id t2U7BoSl019499; Mon, 30 Mar 2015 07:11:50 GMT (envelope-from mav@FreeBSD.org) Received: (from mav@localhost) by svn.freebsd.org (8.14.9/8.14.9/Submit) id t2U7Boix019498; Mon, 30 Mar 2015 07:11:50 GMT (envelope-from mav@FreeBSD.org) Message-Id: <201503300711.t2U7Boix019498@svn.freebsd.org> X-Authentication-Warning: svn.freebsd.org: mav set sender to mav@FreeBSD.org using -f From: Alexander Motin Date: Mon, 30 Mar 2015 07:11:50 +0000 (UTC) To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-10@freebsd.org Subject: svn commit: r280839 - stable/10/sys/amd64/vmm X-SVN-Group: stable-10 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: svn-src-stable-10@freebsd.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: SVN commit messages for only the 10-stable src tree List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 30 Mar 2015 07:11:50 -0000 Author: mav Date: Mon Mar 30 07:11:49 2015 New Revision: 280839 URL: https://svnweb.freebsd.org/changeset/base/280839 Log: MFC r280134: Report ARAT (APIC-Timer-always-running) feature for virtual CPU. This makes FreeBSD guest to not avoid using LAPIC timer, preferring HPET due to worries about non-existing for virtual CPUs deep sleep states. Benchmarks of usleep(1) on guest and host show such extra latencies: - 51us for virtual HPET, - 22us for virtual LAPIC timer, - 22us for host HPET and - 3us for host LAPIC timer. Modified: stable/10/sys/amd64/vmm/x86.c Directory Properties: stable/10/ (props changed) Modified: stable/10/sys/amd64/vmm/x86.c ============================================================================== --- stable/10/sys/amd64/vmm/x86.c Mon Mar 30 07:09:07 2015 (r280838) +++ stable/10/sys/amd64/vmm/x86.c Mon Mar 30 07:11:49 2015 (r280839) @@ -361,6 +361,12 @@ x86_emulate_cpuid(struct vm *vm, int vcp break; case CPUID_0000_0006: + regs[0] = CPUTPM1_ARAT; + regs[1] = 0; + regs[2] = 0; + regs[3] = 0; + break; + case CPUID_0000_000A: /* * Handle the access, but report 0 for