From mboxrd@z Thu Jan 1 00:00:00 1970 From: Chris Mason Subject: Re: billion file testing of btrfs Date: Wed, 18 Aug 2010 20:37:43 -0400 Message-ID: <20100819003743.GG5854@think> References: <4C692F24.5000208@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Cc: linux-btrfs To: Ric Wheeler Return-path: In-Reply-To: <4C692F24.5000208@redhat.com> List-ID: On Mon, Aug 16, 2010 at 08:29:24AM -0400, Ric Wheeler wrote: > > I decided to try btrfs on F13 (2.6.33.6-147.2.4.fc13.x86_64 kernel) > with the following fs_mark command and a 1.5 TB Seagate S-ATA disk: > > # fs_mark -s 0 -S 0 -D 1000 -n 1000000 -L 1000 -d /test/ -l btrfs_log.txt > > btrfs starts off at a fantastic rate - roughly 3-4 times the speed of ext4: The results are interesting, both ext4 and btrfs seem to have a little more than a million inodes in slab cache on my box. The ext4 inode is a little fatter so it's about 2.2GB instead of 1.7GB. I'll let btrfs run overnight. ext4 isn't doing many reads at all but is instead stuck in the log, but there's very little IO. I'm not actually sure what it is doing. Btrfs is doing a healthy amount of writes and batches of reads. -chris