From owner-freebsd-virtualization@freebsd.org Wed Mar 22 11:28:15 2017 Return-Path: Delivered-To: freebsd-virtualization@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 54324D17E72 for ; Wed, 22 Mar 2017 11:28:15 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from kenobi.freebsd.org (kenobi.freebsd.org [IPv6:2001:1900:2254:206a::16:76]) (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 379551682 for ; Wed, 22 Mar 2017 11:28:15 +0000 (UTC) (envelope-from bugzilla-noreply@freebsd.org) Received: from bugs.freebsd.org ([127.0.1.118]) by kenobi.freebsd.org (8.15.2/8.15.2) with ESMTP id v2MBSFGa068888 for ; Wed, 22 Mar 2017 11:28:15 GMT (envelope-from bugzilla-noreply@freebsd.org) From: bugzilla-noreply@freebsd.org To: freebsd-virtualization@FreeBSD.org Subject: [Bug 216759] [kern] Memory speed with small blocks (1K) up to 35 times slower than host system (under QEMU emulation, but not only) Date: Wed, 22 Mar 2017 11:28:15 +0000 X-Bugzilla-Reason: AssignedTo X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: None X-Bugzilla-Product: Base System X-Bugzilla-Component: kern X-Bugzilla-Version: 11.0-RELEASE X-Bugzilla-Keywords: X-Bugzilla-Severity: Affects Many People X-Bugzilla-Who: andrew@azar-a.net X-Bugzilla-Status: New X-Bugzilla-Resolution: X-Bugzilla-Priority: --- X-Bugzilla-Assigned-To: freebsd-virtualization@FreeBSD.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: flagtypes.name attachments.created Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugs.freebsd.org/bugzilla/ Auto-Submitted: auto-generated MIME-Version: 1.0 X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: "Discussion of various virtualization techniques FreeBSD supports." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 22 Mar 2017 11:28:15 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216759 andrew@azar-a.net changed: What |Removed |Added ---------------------------------------------------------------------------- Attachment #181048| |maintainer-approval+ Flags| | --- Comment #18 from andrew@azar-a.net --- Created attachment 181048 --> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=3D181048&action= =3Dedit tsc.c patch to allow KVM hypervisor with host cpu to pass through the good = TSC This patch is not "correct" because it just whitelists Generic virtualizati= on (VM_GUEST_VM), however I don't see how it can be done correctly at this poi= nt of overall coding quality in tsc.c regarding virtualization. I guess a CPU_VENDOR_VIRTUAL should be considered as an option, so we can l= eave host pass-through CPU as a real host CPU and allow virtual CPUs like QEMU_X86_64 or whatever to be treated separately where all ifs and switches= are tested for stability of CPU TSC (that seems to be the Linux approach). --=20 You are receiving this mail because: You are the assignee for the bug.=