Date: Sat, 26 Mar 2005 23:08:06 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: David Schultz <das@freebsd.org> Cc: freebsd-fs@freebsd.org Subject: Re: UFS Subdirectory limit. Message-ID: <17693.1111874886@critter.freebsd.dk> In-Reply-To: Your message of "Sat, 26 Mar 2005 16:30:48 EST." <20050326213048.GA33703@VARK.MIT.EDU>
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In message <20050326213048.GA33703@VARK.MIT.EDU>, David Schultz writes: >On Fri, Mar 25, 2005, Scott Long wrote: >> David Schultz wrote: >> >On Sat, Mar 26, 2005, David Malone wrote: >> > >> >>There was a discussion on comp.unix.bsd.freebsd.misc about two weeks >> >>ago, where someone had an application that used about 150K >> >>subdirectories of a single directory. They wanted to move this >> >>application to FreeBSD, but discovered that UFS is limited to 32K >> >>subdirectories, because UFS's link count field is a signed 16 bit >> >>quantity. Rewriting the application wasn't an option for them. Has anybody here wondered how much searching a 150K directory would suck performance wise ? I realize that with dir-hashing and vfs-cache it is not as bad as it used to be, but I still think it will be unpleasant performance wise. -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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