From owner-freebsd-current@freebsd.org Fri Apr 15 16:13:14 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 D12F5AEDD0A for ; Fri, 15 Apr 2016 16:13:14 +0000 (UTC) (envelope-from sobomax@sippysoft.com) Received: from mail-oi0-x231.google.com (mail-oi0-x231.google.com [IPv6:2607:f8b0:4003:c06::231]) (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 97E6B1AF8 for ; Fri, 15 Apr 2016 16:13:14 +0000 (UTC) (envelope-from sobomax@sippysoft.com) Received: by mail-oi0-x231.google.com with SMTP id w85so128734807oiw.0 for ; Fri, 15 Apr 2016 09:13:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=sippysoft-com.20150623.gappssmtp.com; s=20150623; h=mime-version:sender:in-reply-to:references:date:message-id:subject :from:to:cc; bh=I9p9pQFggWB25CrNlAYnm+rKG4vzwDoU8NjsOiPvjQk=; b=sTz6GWSuimYaOdXbjysMDqQav1ih2StMmutFMt6eVacguXMQtJk+5Zg7CxIS1lS/be nLGLXvUtouDLhSWbeR2MCTLE3rPjufPtj1xR5MlSDaxC0XYchLTu4wYmf3OcAcSV0PgP /kRwc/8MZzCUW7nNhM0SPQywN9VwP2GX3BLBns8VYjQIKB4Mg48H9rblKh1YtzMDi8xn 5NuYBmNoznf0RIn3PseqgLfK5iucruFApYrmWj+zWGdhw050ZTTqenILLWrQvJJGgD0f XsHF2MOLyJNJsAnZf1W7/fG2xfshL3I0L4+5U0wsMYv33xKoJuzQJnhd60EMZtiKHDyi tb2A== 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=I9p9pQFggWB25CrNlAYnm+rKG4vzwDoU8NjsOiPvjQk=; b=dBZj12ungefofFMzqCZsPIEcrh/8RoHbu3lxxshvsJKzyuerWVfmnV8eFTYdGQ+wb8 4t3YVb9f3d86fq+wiME8If0Pmc/8R/I5QglnPRXtz4k2dkUnNIrMI9ulJZKD9DO/e5Pb Xg0gczoB9rqpPQ28urlP012mifb3fJT3+3hj3ByS0Kin4A6jSY8C+lf7zGtBKTDnfRFJ gfhhrGG26S2M8Pgc2adrXCZowRwQ40JT5xj6+djrj1lN280XcZxiPpj0qFbuIE2XB1x8 XPKXPtn3oW7hCrwPkPYPaKbA0MrfiU9I9BJLCqsOtu6b9pEuU1YZLAidOnLv2nSV/X6b M6ow== X-Gm-Message-State: AOPr4FWetOpBETWHnviPTK902IZ+OWRoOJGnESxmrdYG6bRVASnI79t5Z2Y3q1fC7IoqLxe4K5ZXplhtQlDpKDpz MIME-Version: 1.0 X-Received: by 10.157.33.135 with SMTP id s7mr10487147otb.22.1460736793771; Fri, 15 Apr 2016 09:13:13 -0700 (PDT) Sender: sobomax@sippysoft.com Received: by 10.157.37.123 with HTTP; Fri, 15 Apr 2016 09:13:13 -0700 (PDT) In-Reply-To: References: Date: Fri, 15 Apr 2016 09:13:13 -0700 X-Google-Sender-Auth: oDQleAErXxA4pekQ3aT91iscTMg Message-ID: Subject: Re: Heads up From: Maxim Sobolev To: Warner Losh 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: Fri, 15 Apr 2016 16:13:14 -0000 Great, work Warner, thanks! Small note, though. The CAM_IOSCHED_NETFLIX seems like a quite poor name for a kernel option. IMHO there is no good reason for polluting it with the name of the company that sponsored the development. I don't think we have any precedents of doing this unless the option is related to a piece of hardware that the company makes, and it's not the case here. Apart from "coolness" factor as far as I understand that _NETFLIX suffix does not give any tangible benefit for anybody reading kernel config and trying to understand what this option actually does. CAM_IOSCHED_SSDNG or something would be better IMHO. Just my $0.02. -Max On Thu, Apr 14, 2016 at 3:42 PM, 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 > _______________________________________________ > freebsd-current@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-current > To unsubscribe, send any mail to "freebsd-current-unsubscribe@freebsd.org" > >