From owner-freebsd-current Tue Apr 10 14: 2:50 2001 Delivered-To: freebsd-current@freebsd.org Received: from Awfulhak.org (awfulhak.demon.co.uk [194.222.196.252]) by hub.freebsd.org (Postfix) with ESMTP id BD27237B424 for ; Tue, 10 Apr 2001 14:02:43 -0700 (PDT) (envelope-from brian@Awfulhak.org) Received: from hak.lan.Awfulhak.org (root@hak.lan.Awfulhak.org [172.16.0.12]) by Awfulhak.org (8.11.3/8.11.3) with ESMTP id f3AL2Eb06225; Tue, 10 Apr 2001 22:02:14 +0100 (BST) (envelope-from brian@lan.Awfulhak.org) Received: from hak.lan.Awfulhak.org (brian@localhost [127.0.0.1]) by hak.lan.Awfulhak.org (8.11.3/8.11.3) with ESMTP id f3AL2Da63016; Tue, 10 Apr 2001 22:02:13 +0100 (BST) (envelope-from brian@hak.lan.Awfulhak.org) Message-Id: <200104102102.f3AL2Da63016@hak.lan.Awfulhak.org> X-Mailer: exmh version 2.3.1 01/18/2001 with nmh-1.0.4 To: Zhihui Zhang Cc: Matt Dillon , Brian Somers , Jason DiCioccio , "'current@freebsd.org'" , brian@Awfulhak.org Subject: Re: FW: Filesystem gets a huge performance boost In-Reply-To: Message from Zhihui Zhang of "Tue, 10 Apr 2001 16:48:16 EDT." Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 10 Apr 2001 22:02:13 +0100 From: Brian Somers Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG > Why VMIO dir works better if directories are placed close to each other? I > think it only makes the cache data of an individual directory stay in the > memory longer. Is there a way to measure the effectiveness of the disk > drive's cache? The real performance gain is seen when doing stuff with large directory hierarchies such as /usr/ports or (I think) a squid cache. The close proximity of the directories means they can be read/written far more quickly than before (where they were specifically placed in different clusters). > -Zhihui -- Brian Don't _EVER_ lose your sense of humour ! To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message