From owner-freebsd-arm@freebsd.org Tue Mar 22 03:48:16 2016 Return-Path: Delivered-To: freebsd-arm@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 42AA6AD8D4F for ; Tue, 22 Mar 2016 03:48:16 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from mail-pf0-x236.google.com (mail-pf0-x236.google.com [IPv6:2607:f8b0:400e:c00::236]) (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 0FC553F3 for ; Tue, 22 Mar 2016 03:48:16 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: by mail-pf0-x236.google.com with SMTP id 4so160118286pfd.0 for ; Mon, 21 Mar 2016 20:48:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=bsdimp-com.20150623.gappssmtp.com; s=20150623; h=sender:subject:mime-version:from:in-reply-to:date:cc:message-id :references:to; bh=SuNV5x3Wh2ZiIQF3K0IR5pJPplvH58vYHkKLxAyb0uc=; b=XW17cPOPFqJOh4qHBHwY7qRWCaIm31FVarEG5fUYRtpWUSnOQSz7un5N4v70szoyzl 3w7uVr1PFC0vdStu19Apk22JHkiRW6NmcuT/Jq7ZcNTecCfC8A4vHMIJfU3Tbo4BJKIP JKzT4f9DMYJsJNIVzJM5VaoouhgfKtQtWgfH5cLj4xse4mkBhqjdKsgh9NC7E0Gisual scp6yddgio5GsrdBFYEMrLJI9hyiOJd7CUhRWdCItoGo9i/4L09TF958hGVdZOcZsMwK Th4vXqF1z4v1MsaMWWkHBdMj1zJqX2NwL5S8CcdEq4qPxTCd6VGk5sPkQf7V5eFzTzdy nKVw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:sender:subject:mime-version:from:in-reply-to :date:cc:message-id:references:to; bh=SuNV5x3Wh2ZiIQF3K0IR5pJPplvH58vYHkKLxAyb0uc=; b=Wo+O4MJBApNvo/Zt9dr0v4v44IyGIjxrv4iecQFYv6Y0Pp16YWtu3n0RK8A6yJVyCe 4u/5+lP5TyuNHvU1P+sY3+dgrLLIN3nd/MW3ksY32EEAISnPULb+KE5yyPD7vHrnH7Gd mnJwWC77M+td+vnW+MuM8lkAW4dZ28ZtC/y2mT3oFxV9dRhLK70KkbP4u2tDNBJVr4RW xtxjm8vzvWbozyCLxG88qn9dhjzjDQ5CqfN6zynGiBtTznDE953LodCry0zPkMoQcROB 07NgUGH6j6yLRfvHCj5jtX6Tci2LDKw58vzIobzDhn9by++HGSQfDEp8FwfGeYWOXVOL M+uw== X-Gm-Message-State: AD7BkJL2yPiejJzf1klRsmQX4FWg5qzyOstJmE35q2MwWtcqFGcs5tBD2MKu0VBQZ2tdzQ== X-Received: by 10.66.147.103 with SMTP id tj7mr50900641pab.72.1458618495659; Mon, 21 Mar 2016 20:48:15 -0700 (PDT) Received: from [100.127.129.191] ([69.53.245.19]) by smtp.gmail.com with ESMTPSA id v74sm3695257pfa.7.2016.03.21.20.48.14 (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 21 Mar 2016 20:48:15 -0700 (PDT) Sender: Warner Losh Subject: Re: Effect of partitioning on wear-leveling Mime-Version: 1.0 (Mac OS X Mail 8.2 \(2104\)) Content-Type: multipart/signed; boundary="Apple-Mail=_95B15785-E754-4610-8D2E-9D1794AE60F8"; protocol="application/pgp-signature"; micalg=pgp-sha512 X-Pgp-Agent: GPGMail 2.5.2 From: Warner Losh In-Reply-To: <20160322033417.GD83908@www.zefox.net> Date: Mon, 21 Mar 2016 21:48:14 -0600 Cc: freebsd-arm@freebsd.org Message-Id: <271EF73A-077C-44A5-8B58-721405800B9F@bsdimp.com> References: <20160321175952.GA83908@www.zefox.net> <1458586884.68920.96.camel@freebsd.org> <20160321221153.GB83908@www.zefox.net> <1458600070.68920.107.camel@freebsd.org> <1973487B-0AA7-468D-A9CC-319FBE2122F0@netgate.com> <20160322033417.GD83908@www.zefox.net> To: bob prohaska X-Mailer: Apple Mail (2.2104) X-BeenThere: freebsd-arm@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: "Porting FreeBSD to ARM processors." List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 22 Mar 2016 03:48:16 -0000 --Apple-Mail=_95B15785-E754-4610-8D2E-9D1794AE60F8 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=us-ascii > On Mar 21, 2016, at 9:34 PM, bob prohaska wrote: >=20 > On Mon, Mar 21, 2016 at 08:38:13PM -0600, Warner Losh wrote: >>=20 >> One thing that people forget is that the underlying blocks that are = written >> are completely independent of what lba is used to write it. So the = notion >> that you have blocks normally part of /var or /tmp no longer makes = sense. >> Between writing blocks in different order and garbage collection, = modern SD >> cards do a good job of wear averaging. How much you've written to the = drive >> in total drives wear out these days. >>=20 >=20 > How do modern flash devices report end of life? Do problems show up in = error > logs, or does the device simply refuse to work with no warning? Undefined. Either it goes read-only or read-never. :) Warner --Apple-Mail=_95B15785-E754-4610-8D2E-9D1794AE60F8 Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc Content-Type: application/pgp-signature; name=signature.asc Content-Description: Message signed with OpenPGP using GPGMail -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIcBAEBCgAGBQJW8MB+AAoJEGwc0Sh9sBEAY+UQALWv0nTW1z2mEW6yPucnNZBw iuXg0LiUWVDUVDzMVHWxizNs9tydK6JCO7LeSBX21Oz3yXJjHnR/LKmktMYGtkWC RAvawN8Cdu0ksRNLlvNPp9qx/wc2wwflCocaHSC8zur+4WL+u9VVQFtjSMzoSuyN ZqO/IEHu6w0oeW/c+eg+zA96fnwa1604cH7u1cZ8PEIak4SVFOJXqTnRbjdrcyAj XxeRjEa7lsW8LAu5x4T5hog7htlkY0OyKt9ImFSHMIDl/WvPIQVWqDKG4w5prPdx UdcIm1JfTa5nVNvgiZmEq2JQ6xnAZxL0APiObGv4J4v8P/taTdCOlX2AEAJwXlyx +IT37+iSWZgdYHXPOBvmAZywras1If677jZhuxgYJwm7dDBtjyMJtrFkpER9LGp8 3EWnz6YgB7FrvlIpycAwg77UeSpK6ll30a8X4aw8K1cjdLM/DAqvI7c26E+cb4Oj hCFzI4nvQ4K1fUrZFdCfm+PvFs3YkaHknunU2e1IPF+sq5VPimJ3rf/xhgb4v9Lg p2AdWTZ1inVorBq8awi2Qk35DCXj+NIeQhOHgn9PirFCIbaPqX+cJV0Awh2UmnbW Kc6hkSDVkdy2OMUF862gsiDnBED2FYrkjiqT7QDUoWC8DtsyXQ+TFf2hsmgNFO4L q0J+Oew4G5aD1633Qd6v =43AU -----END PGP SIGNATURE----- --Apple-Mail=_95B15785-E754-4610-8D2E-9D1794AE60F8--