From owner-svn-src-all@freebsd.org Fri Apr 15 23:24:44 2016 Return-Path: Delivered-To: svn-src-all@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 5A861B104FA; Fri, 15 Apr 2016 23:24:44 +0000 (UTC) (envelope-from rpokala@mac.com) Received: from mr11p00im-asmtp002.me.com (mr11p00im-asmtp002.me.com [17.110.69.253]) (using TLSv1.2 with cipher DHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client did not present a certificate) by mx1.freebsd.org (Postfix) with ESMTPS id 44EDF1D23; Fri, 15 Apr 2016 23:24:44 +0000 (UTC) (envelope-from rpokala@mac.com) Received: from [192.168.1.4] (c-50-174-208-73.hsd1.ca.comcast.net [50.174.208.73]) by mr11p00im-asmtp002.me.com (Oracle Communications Messaging Server 7.0.5.36.0 64bit (built Sep 8 2015)) with ESMTPSA id <0O5P00MWM7P65L10@mr11p00im-asmtp002.me.com>; Fri, 15 Apr 2016 23:24:43 +0000 (GMT) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:,, definitions=2016-04-16_01:,, signatures=0 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 spamscore=0 clxscore=1011 suspectscore=18 malwarescore=0 phishscore=0 adultscore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1510270003 definitions=main-1604150330 User-Agent: Microsoft-MacOutlook/f.15.1.160411 Date: Fri, 15 Apr 2016 16:24:41 -0700 Subject: Re: svn commit: r298011 - head/sys/cam/ata From: Ravi Pokala Sender: "Pokala, Ravi" To: Warner Losh , Dmitry Morozovsky Cc: Ronald Klop , "svn-src-head@freebsd.org" , "svn-src-all@freebsd.org" , src-committers Message-id: <6910F588-DD07-4CBD-A6DA-3A935CCBC8B6@panasas.com> Thread-topic: svn commit: r298011 - head/sys/cam/ata References: <201604142213.u3EMDklN061064@repo.freebsd.org> <65ACB63B-ACDF-4552-BDA9-40FB028EB0D6@bsdimp.com> In-reply-to: MIME-version: 1.0 Content-type: text/plain; charset=UTF-8 Content-transfer-encoding: 7bit X-BeenThere: svn-src-all@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "SVN commit messages for the entire src tree \(except for " user" and " projects" \)" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 15 Apr 2016 23:24:44 -0000 -----Original Message----- From: on behalf of Warner Losh Date: 2016-04-15, Friday at 16:15 To: Dmitry Morozovsky Cc: Ronald Klop , "svn-src-head@freebsd.org" , "svn-src-all@freebsd.org" , src-committers , Warner Losh Subject: Re: svn commit: r298011 - head/sys/cam/ata >... The 60s value has always been nuts since even the largest caches on the slowest drives can be flushed in under a second. ... I'm not so sure about that. I've got an HDD with 256MB cache; even if it were all sequential, flushing that to the media would likely take more than a second. If it were mostly random, it would be well over a second. That said, I agree that a full minute is overkill. -Ravi (rpokala@) >Warner