From: Mikulas Patocka Subject: Re: [ext3][kernels >= 2.6.20.7 at least] KDE going comatose when FS is under heavy write load (massive starvation) Date: Sat, 28 Apr 2007 07:45:52 +0200 (CEST) Message-ID: References: <1177660767.6567.41.camel@Homer.simpson.net> <20070427013350.d0d7ac38.akpm@linux-foundation.org> <698310e10704270459t7663d39dp977cf055b8db9d2a@mail.gmail.com> <20070427193130.GD5967@schatzie.adilger.int> <20070427201235.GA11170@gnuppy.monkey.org> Mime-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Cc: Linus Torvalds , Andreas Dilger , Marat Buharov , Andrew Morton , Mike Galbraith , LKML , Jens Axboe , "linux-ext4@vger.kernel.org" , Alex Tomas To: Bill Huey Return-path: Received: from artax.karlin.mff.cuni.cz ([195.113.31.125]:40494 "EHLO artax.karlin.mff.cuni.cz" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932561AbXD1Fpy (ORCPT ); Sat, 28 Apr 2007 01:45:54 -0400 In-Reply-To: Sender: linux-ext4-owner@vger.kernel.org List-Id: linux-ext4.vger.kernel.org On Sat, 28 Apr 2007, Mikulas Patocka wrote: > On Fri, 27 Apr 2007, Bill Huey wrote: > Hi > > SpadFS doesn't write to unallocated parts like log filesystems (LFS) or > phase tree filesystems (TUX2); --- BTW, I don't think that writing to unallocated parts of disk is good idea. These filesystems have cool write benchmarks, but one subtle (and unbenchmarkable) problem: They group files according to time when they were created and not according to directory hierarchy. When the user has directory with project files and he edited different files at different times, normal filesystems will place the files near each other (so that "grep blabla *" is fast) and log-structured filesystems will scatter the files over the whole disk. Mikulas