Date: Mon, 10 Apr 2006 18:10:05 +0200 From: Nicolas KOWALSKI <Nicolas.Kowalski@imag.fr> To: freebsd-fs@FreeBSD.org Subject: Re: [patch] giant-less quotas for UFS Message-ID: <vqopsjpv2ci.fsf@corbeau.imag.fr> In-Reply-To: <443A7C8E.4020203@centtech.com> References: <20060329152608.GB1375@deviant.kiev.zoral.com.ua> <vqoy7ydv7lw.fsf@corbeau.imag.fr> <20060410144904.GC1408@deviant.kiev.zoral.com.ua> <vqou091v3vt.fsf@corbeau.imag.fr> <443A7C8E.4020203@centtech.com>
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Eric Anderson <anderson@centtech.com> writes: > Nicolas KOWALSKI wrote: >> Kostik Belousov <kostikbel@gmail.com> writes: >> >>> On Mon, Apr 10, 2006 at 04:16:27PM +0200, Nicolas KOWALSKI wrote: >>>> Hello, >>>> >>>> Kostik Belousov <kostikbel@gmail.com> writes: >>>> >>>>> I already mailed about my development of the patch that >>>>> allows for UFS with quotas to operate without Giant. Sorry if the >>>>> repeat would be annoying. >>>> Does this patch improve the performance of a file server, using >>>> multiple disks, controlled by quotas, exported by NFS/Samba ? >>>> >>>> If so, I would be really interested: our file server (4.11, but >>>> perhaps 6.x soon), has some major slowdowns when one or multiple >>>> user/s exceed her/his quota ; this impact every user, even those >>>> working on another disk. >>> I don't think that patch shall have effect on this situation (quota >>> exceeded). > > If you watch a tcpdump while this is happening, I'll bet you see the > client (over NFS) repeatedly trying to allocate blocks, and the server > returning ENOSPACE. The load and cpu utilization on the server will > skyrocket while it gets hammered with requests for more space. Not > sure what the solution is to this. Yes, this is exactly what is happening. To add some precision, some students here use calculation applications that allocate a lot of disk space, ususally more than their allowed home quotas; when by error they launch these apps in their home directories, instead of their workstation dedicated space, it makes the server go to its knees on the NFS client side. -- Nicolas
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