From owner-freebsd-current@freebsd.org Sat Apr 23 05:59:37 2016 Return-Path: Delivered-To: freebsd-current@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 8D33CB1937A for ; Sat, 23 Apr 2016 05:59:37 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-io0-x244.google.com (mail-io0-x244.google.com [IPv6:2607:f8b0:4001:c06::244]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 579C91739 for ; Sat, 23 Apr 2016 05:59:37 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: by mail-io0-x244.google.com with SMTP id x35so5619569ioi.0 for ; Fri, 22 Apr 2016 22:59:37 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc; bh=EIOmM3B8lAH8aaRQxhRKAXAHNq2eZQjeIGmCarPGC+8=; b=p7Jv7KKbajNL0uo+BGRdB7CDzwVImPKlanTnfzb5bLaCFnddXl2o9mwpNOo/WPwYGl da76gQ75b7pq70bNpk6Z3pCrz4Iuie0qwCYrX4fG3QLBd6h4HoEhJm0s1NX48rIKqVkf wLGrpqoPH1ZgBfFLN0OBhk8iReyu8aKVR5ru+bDXX2Db5zQ4xGJUT2tbljjFbzCY3j3h coDO9rwzbBGUI+Bj84mPGZ6HeNnQg8mdmVn7LnROXJUqRaoevk4BARr1sO+mH0fX0bww b1my7M85j/ovrj1SbIgjEp5FCJbq5tqjmS/HE0z5OnlehoTYgfgs2hISgBm6wmelxznm o7Ew== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:sender:in-reply-to:references:date :message-id:subject:from:to:cc; bh=EIOmM3B8lAH8aaRQxhRKAXAHNq2eZQjeIGmCarPGC+8=; b=kPmgnPlFEnjKz8TCOU58rH2hpWkT3P6Yp4RU7yNAUeam03DtFNIP2zcClXA66sJ1Rt GmH7ZEzIwO5gjY4PtmYkbKMfbTmk/MubV8ETg+oGo4ffhjLsLM3Q7Q88UHmhN1p5JMHo wz0FsSThbFbNjPqRsoYUYWzL7SOoxFLT1sFp9MzNuZdamioLqnd18m78+S5JDenfx7+X bFEWO/aDDEQopDG/SQUj8cId5yj2LGspLnspjJ0h256EAcnDQv/bAaXG3amdUkeDwnB0 HFKM9y4kcuLt3I1qNpQwF19s55C2OrpGlPfNx3yKcCRf1G+l+V75Hdevpu3gxa7bxMo4 JoPQ== X-Gm-Message-State: AOPr4FVvQ/oNc0e8cdeXh8o0kIJHREJablgzYtKEFQdBOBrZA/YO6LI0eZbiXXdxIQ88Pl0+4g3aaSXZCRtOdQ== MIME-Version: 1.0 X-Received: by 10.107.133.151 with SMTP id p23mr27366054ioi.16.1461391176824; Fri, 22 Apr 2016 22:59:36 -0700 (PDT) Sender: wlosh@bsdimp.com Received: by 10.79.104.197 with HTTP; Fri, 22 Apr 2016 22:59:36 -0700 (PDT) X-Originating-IP: [50.253.99.174] In-Reply-To: <20160422213332.7e031073@nonamehost.local> References: <20160422213332.7e031073@nonamehost.local> Date: Fri, 22 Apr 2016 23:59:36 -0600 X-Google-Sender-Auth: s--hURKhu-q_JkPDvTpuvKpdYaY Message-ID: Subject: Re: Heads up From: Warner Losh To: Ivan Klymenko Cc: FreeBSD Current Content-Type: text/plain; charset=UTF-8 X-Content-Filtered-By: Mailman/MimeDel 2.1.21 X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 23 Apr 2016 05:59:37 -0000 On Fri, Apr 22, 2016 at 12:33 PM, Ivan Klymenko wrote: > On Thu, 14 Apr 2016 16:42:33 -0600 > Warner Losh wrote: > > > The CAM I/O scheduler has been committed to current. This work is > > described in > > https://people.freebsd.org/~imp/bsdcan2015/iosched-v3.pdf though the > > default scheduler doesn't change the default (old) behavior. > > > > One possible issue, however, is that it also enables NCQ Trims on ada > > SSDs. There are a few rogue drives that claim support for this > > feature, but actually implement data corrupt instead of queued trims. > > The list of known rogues is believed to be complete, but some caution > > is in order. > > > > Warner > > Hi. > > I have the small issue. > I have one hard drive with zfs. > If i beginning cloning the hard drive in VirtualBox machine - this > process is very slow 1,5-2 hours. > Without CAM_NETFLIX_IOSCHED options - this process two or three times > faster. > With this is possible to do something? > I don't know. I've not investigated this in enough detail to know. One thing you might change is the read bias from 300 to 1, which may be more appropriate for your workload. Warner