From owner-freebsd-stable@FreeBSD.ORG Mon Feb 8 22:38:22 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 5E5A51065672 for ; Mon, 8 Feb 2010 22:38:22 +0000 (UTC) (envelope-from artemb@gmail.com) Received: from mail-iw0-f198.google.com (mail-iw0-f198.google.com [209.85.223.198]) by mx1.freebsd.org (Postfix) with ESMTP id 22AC08FC0C for ; Mon, 8 Feb 2010 22:38:22 +0000 (UTC) Received: by iwn36 with SMTP id 36so1511535iwn.3 for ; Mon, 08 Feb 2010 14:38:21 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:sender:received:in-reply-to :references:date:x-google-sender-auth:message-id:subject:from:to:cc :content-type:content-transfer-encoding; bh=6e7W3Jh5Xd1dUYIMdRb5OF+jih2aEih67Vp+foL4MwY=; b=Sda5lmwUnRzIG9z9sve0U2VkHo6ePbdryZcR36Txn3NiyCq6KNaCRgAuKVGEb4+1Jk OMIXvyU0pjtJ/WrZTcW7+Kc2d9njEMisaW93GwnIMzFvmdA6ZN8aZkYRRpBm7LhJ9IWL AGmglGo6MZpfQNiv05rPq8T229eGJe71dotMk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:sender:in-reply-to:references:date :x-google-sender-auth:message-id:subject:from:to:cc:content-type :content-transfer-encoding; b=on//rAdf1WyrB0uKQ4QDGNQGhBCKzEcE9UYhi2jB0NeNZ7lS0OKziSG1HNbE7hcjOq goRHBVmfsDLHTHMbQDp4CL3gCE84htmPF+ICGJY/VU78wjjxdMz0mrNEfYRHLM3E/3QD 1remRWJs2XacAy5ev6zX2zjAFkNw/EqSa3ChE= MIME-Version: 1.0 Sender: artemb@gmail.com Received: by 10.231.191.135 with SMTP id dm7mr1227877ibb.46.1265668701542; Mon, 08 Feb 2010 14:38:21 -0800 (PST) In-Reply-To: <20100208195620.GA10209@icarus.home.lan> References: <20100208143329.GA12057@megatron.madpilot.net> <20100208145147.GA3733@icarus.home.lan> <20100208171822.12773278@r500.local> <20100208165853.GA43617@megatron.madpilot.net> <20100208195620.GA10209@icarus.home.lan> Date: Mon, 8 Feb 2010 14:38:21 -0800 X-Google-Sender-Auth: 81681c70a383cb33 Message-ID: From: Artem Belevich To: Jeremy Chadwick Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: quoted-printable Cc: freebsd-stable@freebsd.org Subject: Re: ATA_CAM + ZFS gives short 1-2 seconds system freeze on disk load 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, 08 Feb 2010 22:38:22 -0000 > I'd like a technical explanation of exactly what this loader.conf > tunable does. =A0The sysctl -d explanation is useful if one has insight t= o > what purpose it serves. =A0I can find mention on Solaris lists about "txg > timeout", but the context is over my head (intended for those very > familiar with the inner workings of ZFS). Ben Rockwood's blog has pretty decent explanation of how transaction groups in ZFS work: http://www.cuddletech.com/blog/pivot/entry.php?id=3D1015 --Artem