Date: Tue, 10 Apr 2001 12:03:06 +0100 From: Brian Somers <brian@Awfulhak.org> To: Brian Somers <brian@Awfulhak.org> Cc: Jason DiCioccio <Jason.DiCioccio@Epylon.com>, "'current@freebsd.org'" <current@FreeBSD.ORG>, brian@Awfulhak.org Subject: Re: FW: Filesystem gets a huge performance boost Message-ID: <200104101103.f3AB36P49523@hak.lan.Awfulhak.org> In-Reply-To: Message from Brian Somers <brian@Awfulhak.org> of "Tue, 10 Apr 2001 01:39:11 BST." <200104100039.f3A0dBP09449@hak.lan.Awfulhak.org>
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[.....] > > 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 <brian@Awfulhak.org> <brian@[uk.]FreeBSD.org> <http://www.Awfulhak.org>; <brian@[uk.]OpenBSD.org> 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
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