Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756011AbZDCCuL (ORCPT ); Thu, 2 Apr 2009 22:50:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1752554AbZDCCt5 (ORCPT ); Thu, 2 Apr 2009 22:49:57 -0400 Received: from wf-out-1314.google.com ([209.85.200.170]:12707 "EHLO wf-out-1314.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752258AbZDCCt4 convert rfc822-to-8bit (ORCPT ); Thu, 2 Apr 2009 22:49:56 -0400 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type:content-transfer-encoding; b=muY6pTWOG10Fs/siKKPX2ThVpQ4d1XngqvPauxX3Hqm1XIGdhzq0HY0ipiGscva8pM 82mtbIViButzZmvjea7Duu8pGGaRWmfz+8LQVZ9ogmmJH3vdfVz5yRWSRC12m6QBObiA U+bn3hbuQPJEuRfRF5ooY1/hpgG7WmfucbRyc= MIME-Version: 1.0 In-Reply-To: References: <49CCCB0A.6070701@nokia.com> <20090403020525.GI9870@mit.edu> Date: Thu, 2 Apr 2009 20:49:55 -0600 Message-ID: <9b1675090904021949g301b1bbaxd1810ce82185e002@mail.gmail.com> Subject: Re: EXT4-ish "fixes" in UBIFS From: "Trenton D. Adams" To: Christian Kujau Cc: Theodore Tso , Artem Bityutskiy , Linux Kernel Mailing List Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8BIT Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1201 Lines: 29 On Thu, Apr 2, 2009 at 8:45 PM, Christian Kujau wrote: > On Thu, 2 Apr 2009, Theodore Tso wrote: >> It will, but you might not like the performance.... ?the reason why >> it's there is that some users might want the particular tradeoff, but >> it probably wouldn't make a good default. > > Thanks for confirming this. Yes, I know about the performance impact, but > perhaps it's feasible for some setups. > > Christian. > > PS: I was curious *how* bad the impact was and so I tried generating a > ? ?477 MB tarball, first on an async, then on an sync mounted partition: > > ? /dev/md0 /mnt/md0 ext4 rw,noatime,barrier=1,data=ordered > ? $ time tar -cf /mnt/md0/test.tar /usr > ? real 1m36.615s > > ? /dev/md0 /mnt/md0 ext4 rw,sync,noatime,barrier=1,data=ordered > ? $ time tar -cf /mnt/md0/test.tar /usr > ? real 5m23.793s lol, yep sounds about right. Probably much worse on my machine, given the disk speed is around 20-23M/sec. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/