From owner-freebsd-current Tue Apr 10 4: 3:42 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 DD7BB37B422 for ; Tue, 10 Apr 2001 04:03:38 -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 f3AB3WU10412; Tue, 10 Apr 2001 12:03:32 +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 f3AB36P49523; Tue, 10 Apr 2001 12:03:06 +0100 (BST) (envelope-from brian@hak.lan.Awfulhak.org) Message-Id: <200104101103.f3AB36P49523@hak.lan.Awfulhak.org> X-Mailer: exmh version 2.3.1 01/18/2001 with nmh-1.0.4 To: Brian Somers Cc: Jason DiCioccio , "'current@freebsd.org'" , brian@Awfulhak.org Subject: Re: FW: Filesystem gets a huge performance boost In-Reply-To: Message from Brian Somers of "Tue, 10 Apr 2001 01:39:11 BST." <200104100039.f3A0dBP09449@hak.lan.Awfulhak.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Date: Tue, 10 Apr 2001 12:03:06 +0100 From: Brian Somers Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.ORG [.....] > > The second improvement, contributed by > > gluk@openbsd.org, is a new directory allocation policy (codenamed > > "dirpref"). Coupled with soft updates, the new dirpref code offers up > > to a 60x speed increase in gluk's tests, documented here:" > > > > http://groups.google.com/groups?q=dirpref&num=100&hl=en&lr=&safe=off&rnum=2&seld=905073910&ic=1 > > I do like the dirpref stuff, but I can't comment much on it > except that it looks like a good change that should be fairly easy to > bring into FreeBSD. > > I'm not 100% convinced about the algorithm to avoid clusters filling > up with directory-only entries (it looks like a worst-case would fill > a cluster with 50% directories and 50% files leaving a bad layout when > the directories are populated further), but then the non-dirpref > scheme has some far worse worst-case scenarios ;-) Just to follow up on myself... it seems the dirpref stuff was committed to FreeBSD this morning :-] -- 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