From mboxrd@z Thu Jan 1 00:00:00 1970 From: Jeff Moyer Subject: Re: [PATCH 26/30] ext4: do not send discards as barriers Date: Mon, 30 Aug 2010 15:56:43 -0400 Message-ID: References: <1282751267-3530-1-git-send-email-tj@kernel.org> <1282751267-3530-27-git-send-email-tj@kernel.org> <20100825155842.GA3229@lst.de> <20100825160032.GC3229@lst.de> <4C753D75.2010305@kernel.org> <20100825200223.GE2738@quack.suse.cz> <4C76250B.6060800@kernel.org> <20100827173147.GA12374@quack.suse.cz> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: In-Reply-To: <20100827173147.GA12374@quack.suse.cz> (Jan Kara's message of "Fri, 27 Aug 2010 19:31:48 +0200") Sender: linux-raid-owner@vger.kernel.org To: Jan Kara Cc: Tejun Heo , Christoph Hellwig , jaxboe@fusionio.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-scsi@vger.kernel.org, linux-ide@vger.kernel.org, linux-raid@vger.kernel.org, James.Bottomley@suse.de, tytso@mit.edu, chris.mason@oracle.com, swhiteho@redhat.com, konishi.ryusuke@lab.ntt.co.jp, dm-devel@redhat.com, vst@vlnb.net, rwheeler@redhat.com, hare@suse.de, neilb@suse.de, rusty@rustcorp.com.au, mst@redhat.com, jeremy@goop.org, snitzer@redhat.com, k-ueda@ct.jp.nec.com, Christoph Hellwig List-Id: linux-raid.ids Jan Kara writes: > An update: I've set up an ext4 barrier testing in KVM - run fsstress, > kill KVM at some random moment and check that the filesystem is consistent > (kvm is run in cache=writeback mode to simulate disk cache). About 70 runs But doesn't your "disk cache" survive the "power cycle" of your guest? It's tough to tell exactly what you're testing with so few details; care to elaborate? Cheers, Jeff