From owner-freebsd-fs@freebsd.org Fri Aug 26 12:28:57 2016 Return-Path: Delivered-To: freebsd-fs@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 0596DB70330 for ; Fri, 26 Aug 2016 12:28:57 +0000 (UTC) (envelope-from ben.rubson@gmail.com) Received: from mail-wm0-x232.google.com (mail-wm0-x232.google.com [IPv6:2a00:1450:400c:c09::232]) (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 7F0CED51 for ; Fri, 26 Aug 2016 12:28:56 +0000 (UTC) (envelope-from ben.rubson@gmail.com) Received: by mail-wm0-x232.google.com with SMTP id o80so116950825wme.1 for ; Fri, 26 Aug 2016 05:28:56 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20120113; h=mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=F3jApljpOWP8y/fi8jJ1fuZ3JXVzAJchoDMMYCjmrM4=; b=PUNonFeg8rs3wQeg9DEClQ9dfrt9DtAyHmmXs6h29dGKI8nEdHFQr9v07dnaYo907O /A/1C0mNE3R0rp23T+LP8J66S/q+rMqnBxG4mGCPBKsknN/qusPAHuLFPu3xBxd5pASD Ykw3lbFU4zad+FDY77jDJzqkFfLABY84JTvjuG5U0x1xi0NZhC6+xNQl7Wvsj26zkLuN uqLyZSY9K2a8hpArzC0eo8X25Spo6usVxQnQNP/MePRAu8mW9FpwP0Qw4efLR53+GBA3 v7Y+OcPKsqbsQqCQv6NinuJZtCSsJDsWbwrFeVEyGmnLL3P/TarWe1sriacp4sHQdbJN Wi/Q== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:mime-version:subject:from:in-reply-to:date :content-transfer-encoding:message-id:references:to; bh=F3jApljpOWP8y/fi8jJ1fuZ3JXVzAJchoDMMYCjmrM4=; b=Vs6uz9Kvo6PRP/t0KjpTztF3CZQbyT97gPew/WfwyR+ZftHctxbyPKyv/pt825M1o7 75i1WNZJ/xvChSq5gk6V384yojdQfewRbR3pnyHF3vpRU8gnZ3BnSSB5Dj7fBfHG7WER vmggss4UuQ73nDVRbf8wO1pfoznacOAGTKjqkzPIJoXB1IWD5YYAsv9cnp05gKzvSqN3 RpbhXws0z+9i3vdJaNo14Wzw5Z1Clni4mHDpn7vx3IPHFHEp2J4f02cP78of5sCxc8mM /r40saVsPgYjRr5tBqS5u+U2WKpRbR4rUY0R0/0TpxOIY0LuX8O1BAsyQ/oKCTUHBC7t x2nQ== X-Gm-Message-State: AE9vXwOgBvLxwtnEnaita7uRQ5mwZByK++EBDp67Sd/GmM4NxnJeThKrPYvGSFuM/xDxCg== X-Received: by 10.194.175.170 with SMTP id cb10mr3994668wjc.17.1472214534625; Fri, 26 Aug 2016 05:28:54 -0700 (PDT) Received: from macbook-air-de-benjamin-1.home (ANice-651-1-19-245.w86-203.abo.wanadoo.fr. [86.203.34.245]) by smtp.gmail.com with ESMTPSA id ub8sm19821922wjc.39.2016.08.26.05.28.53 for (version=TLS1 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 26 Aug 2016 05:28:54 -0700 (PDT) Content-Type: text/plain; charset=windows-1252 Mime-Version: 1.0 (Mac OS X Mail 9.3 \(3124\)) Subject: Re: [ZFS] ARC accounting bug ? From: Ben RUBSON In-Reply-To: Date: Fri, 26 Aug 2016 14:28:52 +0200 Content-Transfer-Encoding: quoted-printable Message-Id: <91665D7B-D2EA-4A7F-BE8D-67BE238DAF6B@gmail.com> References: <5B8C6663-5D21-4C03-AC69-CB7E70D3A6C2@gmail.com> <067ac0ed-1f2d-c9fb-de4d-ed5da62fe10c@internetx.com> <9EAAEEC5-0FFF-474D-9AD0-4447CD6B549B@gmail.com> To: FreeBSD FS X-Mailer: Apple Mail (2.3124) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.22 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Aug 2016 12:28:57 -0000 Yes Juergen, metadata only stores in ARC files' info (location in pool = and some other useful info), not the user data. I think "find" only needs metadata, as it does not read the files' = content. Which can be "verified" because : - there is no IO at all on the pool (after the first find loop, once ARC = has the needed metadata) ; - there is no ARC demand data at all. But I may be wrong, so of course feel free to correct me. Thank you. Thank you for the links, I already read them before posting here, but I = may have missed something. Ben > On 26 Aug 2016, at 14:16, InterNetX - Juergen Gotteswinter = wrote: >=20 > so, you know the difference between >=20 > - metadata > - data >=20 > ? >=20 > if yes, what is your find actually doing in this case? >=20 > regarding arc >=20 > http://dtrace.org/blogs/brendan/2012/01/09/activity-of-the-zfs-arc/ > = https://www.patpro.net/blog/index.php/2014/03/19/2628-zfs-primarycache-all= -versus-metadata/ >=20 >=20 >=20 > Am 26.08.2016 um 14:06 schrieb Ben RUBSON: >> Juergen, thank you for your answer. >> So where do you think these ARC misses come from ? I can't find out = :S >> Thank you ! >>=20 >>> On 26 Aug 2016, at 14:01, InterNetX - Juergen Gotteswinter = wrote: >>>=20 >>> no bug, everything like i whould expect >>>=20 >>> Am 26.08.2016 um 11:40 schrieb Ben RUBSON: >>>> uname -v >>>> FreeBSD 11.0-RC2 #0 r304729: Wed Aug 24 06:59:03 UTC 2016 = root@releng2.nyi.freebsd.org:/usr/obj/usr/src/sys/GENERIC >>>> _______________________________________________ >>>> freebsd-fs@freebsd.org mailing list >>>> https://lists.freebsd.org/mailman/listinfo/freebsd-fs >>>> To unsubscribe, send any mail to = "freebsd-fs-unsubscribe@freebsd.org" >>>>=20 >>=20 >> _______________________________________________ >> freebsd-fs@freebsd.org mailing list >> https://lists.freebsd.org/mailman/listinfo/freebsd-fs >> To unsubscribe, send any mail to "freebsd-fs-unsubscribe@freebsd.org" >>=20