From owner-freebsd-current@freebsd.org Wed Apr 20 15:13:52 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 C432DB16490 for ; Wed, 20 Apr 2016 15:13:52 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: from mail-ig0-x243.google.com (mail-ig0-x243.google.com [IPv6:2607:f8b0:4001:c05::243]) (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 954351F48 for ; Wed, 20 Apr 2016 15:13:52 +0000 (UTC) (envelope-from wlosh@bsdimp.com) Received: by mail-ig0-x243.google.com with SMTP id fn8so7105599igb.2 for ; Wed, 20 Apr 2016 08:13:52 -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=1f6BUOa1jn2+Ypqo+Yg8W36OTONJ1cVG77twfT/K5k8=; b=l8q0paVmzutgt+SFZ1yZ5vn+ikUgBzrQrWm3cGzGpdYL4GmAMH8jwQ4qhsnU+9dCar pTcEwPtlIVncUfvYmNeeWEOl78R21ZrW2J1J+evuXXNkg4oul2Qt/lR299BwV9IjbUrb 1FWtRLIrxTEmMZs0QzDiEsEnBIJhdvwpRNzDn193koFT6+R4DHKcfUN5nn/0y6kKeNju 98Rn8n9Jv5QEdiFCt+GvmabQLjFxFlqHJR1BxQ+PYOikAlkpdw79hvnao3se3Qt+tUQa aClWBU5KXpOAOEma+hBZiKG0VY2PAttpYkzzD/wfro/ctRhwa97+hw52G8xbxTVSU4+A cwUA== 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=1f6BUOa1jn2+Ypqo+Yg8W36OTONJ1cVG77twfT/K5k8=; b=cyqi/gmk08QR4xJYHxG1d/uZIjBwX0/htwTgyR5XOqpfs3/myRCN/qLdS6HH7CRWAb ujS3JtOWL4pOFWZF1jSce6IVuovwPXdTWSOWoG/nFHrq9ccg52MOKbqD+P6hDAUTHwey fYksKYc8w7xyXQRY1NaqbIn/Dqx8EH3i3bd+iIo/A59weu3SyuhSHvTgjXLbqWoRzmOL iUcXh9T14v7VqtPbtbUFJWlZ9qOZNGoF01+mz5UhLgAEUO3rRd6rPjv/dt3VL4ZXsbhe SKQiS1ZZxHwQvrtR28cErSGOkPh+enu5XW9INQgcwNJCRHRMtGHV9UpRIoq7qvF9QDQ4 Ps4w== X-Gm-Message-State: AOPr4FUiAQmJaPMplpGbhQ+uOMiPfi8naWTOI6BevIvC+O+2QNwca3bGDrFjODbxB19iqyRKFUrUgxdHsv3S5Q== MIME-Version: 1.0 X-Received: by 10.50.150.1 with SMTP id ue1mr4152567igb.52.1461165231584; Wed, 20 Apr 2016 08:13:51 -0700 (PDT) Sender: wlosh@bsdimp.com Received: by 10.79.104.197 with HTTP; Wed, 20 Apr 2016 08:13:51 -0700 (PDT) X-Originating-IP: [50.253.99.174] In-Reply-To: <0f6a84a9-4bae-4dc1-4f6e-169c16232cf6@gmail.com> References: <0f6a84a9-4bae-4dc1-4f6e-169c16232cf6@gmail.com> Date: Wed, 20 Apr 2016 09:13:51 -0600 X-Google-Sender-Auth: QxAeTWLKgKc9dbyrk4Tx7Jg8_3w Message-ID: Subject: Re: Heads up From: Warner Losh To: Johan Hendriks 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: Wed, 20 Apr 2016 15:13:52 -0000 On Wed, Apr 20, 2016 at 1:10 AM, Johan Hendriks wrote: > Op 15/04/16 om 19:30 schreef Warner Losh: > > > Also a horrible name. It's a generic I/O scheduler. It can do lots of > > things. I keep saying that, and categorically refuse to name the more > > expansive scheduler anything that's so limiting. > > > > Warner > Thanks for all the work on this. > > One question? > > If the scheduler can do a lot of things what are the defaults set to? > Are they set to the Netflix load or more like the behauvier of a > standard FreeBSD before this patch. > Mostly neutral. You have to turn on the different steering engines. However, it does favor reads over writes, which may be a problem for write intensive work loads. Warner