From owner-svn-src-projects@FreeBSD.ORG Thu Jan 27 20:20:33 2011 Return-Path: Delivered-To: svn-src-projects@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id BC48E1065673; Thu, 27 Jan 2011 20:20:33 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: from mail-wy0-f182.google.com (mail-wy0-f182.google.com [74.125.82.182]) by mx1.freebsd.org (Postfix) with ESMTP id 00B918FC19; Thu, 27 Jan 2011 20:20:32 +0000 (UTC) Received: by wyf19 with SMTP id 19so2502451wyf.13 for ; Thu, 27 Jan 2011 12:20:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:sender:message-id:date:from:user-agent :mime-version:to:cc:subject:references:in-reply-to:content-type :content-transfer-encoding; bh=Bv1qSrLv9qUAs5tSPbqDLJZbucri+/R7gymdTXSt5Mk=; b=RG572VqH7Y5ksNh1UrIFG8yCKBhwqk0HKWTQODaO8/9FJSBTKuvb6aIbWQ20W3mqCn JvlqtOQp6exjuEf1Nod5ZKM1W3M78CZGCD9AaVNmBbtB2eIhRhNjMdHXHkBKVCiDsrtV WkcUMF8Q7nGUC8X/8sRzyVs879sEm1H2svY6M= 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:content-type:content-transfer-encoding; b=o03ZzAln5NwiPl8C8Okdw1pRGVV5I7vQJxcc/tOBCmaza5NAcjJ3sgCuUcWAjUrwkk Q+jbAoBjQIUO1+S1QdwA9CJMyBzkW8uYqKUO9zlrWP7Il796ndzgvQkNBYCtm6Q354FZ sCprLZ4fTT9GFpKteAKEFYUBEOMLIbdvsmg3A= Received: by 10.216.19.133 with SMTP id n5mr6708980wen.83.1296159631414; Thu, 27 Jan 2011 12:20:31 -0800 (PST) Received: from mavbook.mavhome.dp.ua (95-109-156-28.dialup.umc.net.ua [95.109.156.28]) by mx.google.com with ESMTPS id 7sm8612989wet.0.2011.01.27.12.20.26 (version=SSLv3 cipher=RC4-MD5); Thu, 27 Jan 2011 12:20:30 -0800 (PST) Sender: Alexander Motin Message-ID: <4D41D37B.2040907@FreeBSD.org> Date: Thu, 27 Jan 2011 22:20:11 +0200 From: Alexander Motin User-Agent: Mozilla/5.0 (X11; U; FreeBSD amd64; en-US; rv:1.9.2.12) Gecko/20101104 Thunderbird/3.1.6 MIME-Version: 1.0 To: Warner Losh References: <201101271956.p0RJuG0f033255@svn.freebsd.org> In-Reply-To: <201101271956.p0RJuG0f033255@svn.freebsd.org> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Cc: svn-src-projects@freebsd.org, src-committers@FreeBSD.org Subject: Re: svn commit: r217972 - projects/graid/head/sys/geom/raid X-BeenThere: svn-src-projects@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: "SVN commit messages for the src " projects" tree" List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 27 Jan 2011 20:20:33 -0000 On 27.01.2011 21:56, Warner Losh wrote: > (3) Update metadata after each bundle of slabs. (mav: please comment on > frequency) I would do it once for every few minutes or few percents or some comparable number of gigabytes. Doing it more often is pointless, while it may significantly affect performance, as metadata write is synchronous now. gmirror does it every MAXPHYS * 100 bytes, but I would say that doing it every 12.8MB is too often for modern HDDs speeds. -- Alexander Motin