Date: Tue, 2 Aug 2011 19:12:24 +0930 From: "Daniel O'Connor" <doconnor@gsoft.com.au> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org, "seanrees@gmail.com" <seanrees@gmail.com> Subject: Re: ZFS directory with a large number of files Message-ID: <960112E7-2331-449A-8736-C8790B05FE20@gsoft.com.au> In-Reply-To: <20110802090830.GA92646@icarus.home.lan> References: <CAJGy1F0d7jeyaFuNdXe%2BucTL2r7R4suCyu8xG7WRHenMFZH-6g@mail.gmail.com> <20110802090830.GA92646@icarus.home.lan>
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On 02/08/2011, at 18:38, Jeremy Chadwick wrote: > On Tue, Aug 02, 2011 at 08:39:03AM +0100, seanrees@gmail.com wrote: >> On my FreeBSD 8.2-S machine (built circa 12th June), I created a >> directory and populated it over the course of 3 weeks with about 2 >> million individual files. >=20 > I'll keep this real simple: >=20 > Why did you do this? >=20 > I hope this was a stress test of some kind. If not: >=20 > This is the 2nd or 3rd mail in recent months from people saying "I > decided to do something utterly stupid with my filesystem[1] and now = I'm > asking why performance sucks". >=20 > Why can people not create proper directory tree layouts to avoid this > problem regardless of what filesystem is used? I just don't get it. >=20 > [1]: Applies to any filesystem, not just ZFS. There was a UFS one a > month or two ago too=85 The problem is that he is being punished with shitty FS performance even = though the directory structure is now non-silly. It sounds like the FS hasn't GC'd some (now unneeded) metadata.. -- Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C
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