From owner-freebsd-stable@FreeBSD.ORG Mon Jul 12 06:02:53 2010 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BA5821065675 for ; Mon, 12 Jul 2010 06:02:53 +0000 (UTC) (envelope-from jhellenthal@gmail.com) Received: from mail-iw0-f182.google.com (mail-iw0-f182.google.com [209.85.214.182]) by mx1.freebsd.org (Postfix) with ESMTP id 76A6A8FC1F for ; Mon, 12 Jul 2010 06:02:53 +0000 (UTC) Received: by iwn35 with SMTP id 35so5355088iwn.13 for ; Sun, 11 Jul 2010 23:02:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:message-id:date:from :user-agent:mime-version:to:cc:subject:references:in-reply-to :x-enigmail-version:openpgp:content-type:content-transfer-encoding; bh=nh6ex/2xZqdbLEcVBrmploOSeIBPLOwM4T+xgYN8Sms=; b=ZdLei6VQv4xxIPPPzaKQ9m64viFsIAtET5jMRSfNfzZ39074GqVbUa/4aZzQ0w+8ko rDPKKMcK7AjcdXd2kj58xNZ8/F+HOpGfGPLnyIPHd4OO3YfNVe0rc/R5lNlkKT/rZ9X0 BvXYhNJ2zkq2966pGvnSIKsBM1bz2qwPhM0g8= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:openpgp:content-type :content-transfer-encoding; b=THYWWPWiwDmVaTsLNVYPbyGQgJup+mLAGXpRz119I21qQP/j6MvrMUjq3PGDgg9J1n 0IbAKViPJpO/EybCSa7sUFBlOXnxUsMjZn/Erl5UGFvakT3WsgxqNdVFqj2bzkoebuk9 dK19X4Yg3D5uk7MyDUlRYrfMAt5XBPQqSoLS4= Received: by 10.231.185.142 with SMTP id co14mr14025485ibb.97.1278914572298; Sun, 11 Jul 2010 23:02:52 -0700 (PDT) Received: from centel.dataix.local (adsl-99-181-132-254.dsl.klmzmi.sbcglobal.net [99.181.132.254]) by mx.google.com with ESMTPS id h8sm18047533ibk.15.2010.07.11.23.02.50 (version=SSLv3 cipher=RC4-MD5); Sun, 11 Jul 2010 23:02:51 -0700 (PDT) Sender: "J. Hellenthal" Message-ID: <4C3AB00C.9070905@dataix.net> Date: Mon, 12 Jul 2010 02:02:52 -0400 From: jhell User-Agent: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.9.1.10) Gecko/20100626 Thunderbird MIME-Version: 1.0 To: Freddie Cash References: <20100711182511.GA21063@soda.CSUA.Berkeley.EDU> <20100711204757.GA81084@icarus.home.lan> <20100711211213.GA36377@catsspat.iriomote> <20100711214546.GA81873@icarus.home.lan> <20100711222818.GA37207@catsspat.iriomote> In-Reply-To: X-Enigmail-Version: 1.0.1 OpenPGP: id=89D8547E Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit Cc: freebsd-stable@freebsd.org, Jeremy Chadwick , Richard Lee Subject: Re: Serious zfs slowdown when mixed with another file system (ufs/msdosfs/etc.). X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 12 Jul 2010 06:02:53 -0000 On 07/11/2010 23:08, Freddie Cash wrote: > Search the archives for the -stable, -current, and -fs mailing lists > from the past 3 months. There are patches floating around to fix > this. The ZFS code that monitors memory pressure currently only > monitors the "free" amount, and completely ignores the "inact" and > other "not actually in use" amounts. > AFAIR, any of the patches that were around were either incomplete or inconsistent & were good attempts to solve the problem but turned out in the end to not effect the problem in a positive or negative way. I may be wrong as it seems the problem has a few variables that determine its effect in different cases, usage, hardware mixture & implementation. If there is one thing that I have been seeing more of was the perl hack that gets every process on your system to swap-out to free RAM for use by ZFS or whatever its intention. perl -e '$x = "x" x 1000000;' It might be a good thing to mention this on the ZFS tuning section of the wiki for reference. Regards & Good Luck, -- +-+-+-+-+-+ |j|h|e|l|l| +-+-+-+-+-+