From owner-freebsd-virtualization@FreeBSD.ORG Fri Mar 27 17:00:37 2015 Return-Path: Delivered-To: freebsd-virtualization@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 E2BEE300 for ; Fri, 27 Mar 2015 17:00:37 +0000 (UTC) Received: from webmail2.jnielsen.net (webmail2.jnielsen.net [50.114.224.20]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (Client CN "webmail2.jnielsen.net", Issuer "freebsdsolutions.net" (not verified)) by mx1.freebsd.org (Postfix) with ESMTPS id A54A622E for ; Fri, 27 Mar 2015 17:00:37 +0000 (UTC) Received: from [10.10.1.196] (office.betterlinux.com [199.58.199.60]) (authenticated bits=0) by webmail2.jnielsen.net (8.15.1/8.15.1) with ESMTPSA id t2RH0X35086547 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 27 Mar 2015 11:00:36 -0600 (MDT) (envelope-from lists@jnielsen.net) X-Authentication-Warning: webmail2.jnielsen.net: Host office.betterlinux.com [199.58.199.60] claimed to be [10.10.1.196] Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2070.6\)) Subject: Re: Bhyve storage improvements (was: Several bhyve quirks) From: John Nielsen In-Reply-To: <98136D5B-297B-4538-8EF4-EA2872C6640B@jnielsen.net> Date: Fri, 27 Mar 2015 11:00:33 -0600 Content-Transfer-Encoding: quoted-printable Message-Id: References: <5515270A.7050408@FreeBSD.org> <98136D5B-297B-4538-8EF4-EA2872C6640B@jnielsen.net> To: freebsd-virtualization@freebsd.org X-Mailer: Apple Mail (2.2070.6) Cc: Julian Hsiao X-BeenThere: freebsd-virtualization@freebsd.org X-Mailman-Version: 2.1.18-1 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: Fri, 27 Mar 2015 17:00:38 -0000 On Mar 27, 2015, at 10:47 AM, John Nielsen wrote: > On Mar 27, 2015, at 3:46 AM, Alexander Motin wrote: >=20 >>> I've always assumed virtio driver > emulated driver so it didn't = occur >>> to me to try ahci-hd. >>=20 >> I've just merged to FreeBSD stable/10 branch set of bhyve changes = that >> should significantly improve situation in the storage area. >>=20 >> virtio-blk driver was fixed to work asynchronously and not block = virtual >> CPU, that should fix many problems with performance and = interactivity. >> Both virtio-blk and ahci-hd drivers got ability to execute multiple = (up >> to 8) requests same time, that should proportionally improve parallel >> random I/O performance on wide storages. At this point virtio-blk is >> indeed faster then ahci-hd on high IOPS, and they both are faster = then >> before. >>=20 >> On the other side ahci-hd driver now got TRIM support to allow = freeing >> unused space on backing ZVOL. Unfortunately there is no any = TRIM/UNMAP >> support in virtio-blk API to allow the same. >>=20 >> Also both virtio-blk and ahci-hd drivers now report to guest logical = and >> physical block sizes of underlying storage, that allow guests = properly >> align partitions and I/Os for best compatibility and performance. >=20 > Mav, thank you very much for all this great work and for the concise = summary. TRIM on AHCI makes it compelling for a lot of use cases despite = the probable performance hit. >=20 > Does anyone have plans (or know about any) to implement virtio-scsi = support in bhyve? That API does support TRIM and should retain most or = all of the low-overhead virtio goodness. Okay, some belated googling reminded me that this has been listed as an = "open task" in the last couple of FreeBSD quarterly status reports and = discussed at one or more devsummits. I'd still be interested to know if = anyone's actually contemplated or started doing the work though. :) JN