From owner-freebsd-fs@FreeBSD.ORG Wed Feb 20 10:59:00 2013 Return-Path: Delivered-To: freebsd-fs@FreeBSD.org Received: from mx1.freebsd.org (mx1.FreeBSD.org [8.8.178.115]) by hub.freebsd.org (Postfix) with ESMTP id A09CDC1D for ; Wed, 20 Feb 2013 10:59:00 +0000 (UTC) (envelope-from avg@FreeBSD.org) Received: from citadel.icyb.net.ua (citadel.icyb.net.ua [212.40.38.140]) by mx1.freebsd.org (Postfix) with ESMTP id E7CA16FB for ; Wed, 20 Feb 2013 10:58:59 +0000 (UTC) Received: from odyssey.starpoint.kiev.ua (alpha-e.starpoint.kiev.ua [212.40.38.101]) by citadel.icyb.net.ua (8.8.8p3/ICyb-2.3exp) with ESMTP id MAA24598; Wed, 20 Feb 2013 12:58:49 +0200 (EET) (envelope-from avg@FreeBSD.org) Message-ID: <5124AC69.6010709@FreeBSD.org> Date: Wed, 20 Feb 2013 12:58:49 +0200 From: Andriy Gapon User-Agent: Mozilla/5.0 (X11; FreeBSD amd64; rv:17.0) Gecko/20130206 Thunderbird/17.0.2 MIME-Version: 1.0 To: Kevin Day Subject: Re: Improving ZFS performance for large directories References: <19DB8F4A-6788-44F6-9A2C-E01DEA01BED9@dragondata.com> <20130201192416.GA76461@server.rulingia.com> <19E0C908-79F1-43F8-899C-6B60F998D4A5@dragondata.com> In-Reply-To: <19E0C908-79F1-43F8-899C-6B60F998D4A5@dragondata.com> X-Enigmail-Version: 1.4.6 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: FreeBSD Filesystems X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.14 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Feb 2013 10:59:00 -0000 on 19/02/2013 22:10 Kevin Day said the following: > Timing doing an "ls" in large directories 20 times, the first is the slowest, then all subsequent listings are roughly the same. There doesn't appear to be any gain after 20 repetitions I think that the above could be related to the below > vfs.zfs.arc_meta_limit 16398159872 > vfs.zfs.arc_meta_used 16398120264 -- Andriy Gapon