From owner-freebsd-virtualization@freebsd.org Tue Feb 28 20:22:30 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 B42A8CF2E7B for ; Tue, 28 Feb 2017 20:22:30 +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 A3036BB7 for ; Tue, 28 Feb 2017 20:22:30 +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 v1SKMUx3045912 for ; Tue, 28 Feb 2017 20:22:30 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: Tue, 28 Feb 2017 20:22:30 +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: 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: Tue, 28 Feb 2017 20:22:30 -0000 https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D216759 --- Comment #12 from andrew@azar-a.net --- Ok I tried removing the "hypervisor" feature from CPU and it resulted in 1390MB/s on TSC-low by default in the VPS (same as kvm-clock I must notice)= ... So seems like FreeBSD does something as not to run slow with "hypervisor" f= lag but it is turned off when you disable the flag. Also networking stopped working without that flag for some reason, routing stopped working. So in the end the only fix I see currently is forcing TSC-low manually in FreeBSD until the code is fixed not to penalize TSC on all new platforms. Linux is fixed with disabled kvmclock (seems like debian 7 backport from 8 = is not the latest so that might be the trouble). --=20 You are receiving this mail because: You are the assignee for the bug.=