From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail1.xortex.at ([95.130.251.167]:47620 "EHLO mail1.xortex.at" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932180AbbLNKen convert rfc822-to-8bit (ORCPT ); Mon, 14 Dec 2015 05:34:43 -0500 From: =?Windows-1252?Q?Georg_Sch=F6nberger?= To: Christoph Hellwig CC: Martin Steigerwald , Jens Axboe , Linux FS-Devel , Jeff Moyer , Linux Block mailing list , XFS mailing list Subject: Re: XFS and nobarrier with SSDs Date: Mon, 14 Dec 2015 10:34:30 +0000 Message-ID: <566E9B36.9080509@xortex.com> References: <3496214.YTSKClH6pV@merkaba> <566E6524.6070401@xortex.com> <3911767.qVqsL1TcMv@merkaba> <20151214095823.GA30662@infradead.org> <566E978E.2070502@xortex.com> <20151214102750.GA29192@infradead.org> In-Reply-To: <20151214102750.GA29192@infradead.org> Content-Language: de-DE Content-Type: text/plain; charset="Windows-1252" Content-ID: Content-Transfer-Encoding: 8BIT MIME-Version: 1.0 Sender: linux-fsdevel-owner@vger.kernel.org List-ID: On 2015-12-14 11:27, Christoph Hellwig wrote: > On Mon, Dec 14, 2015 at 10:18:54AM +0000, Georg Sch?nberger wrote: >>> Or to phrase it >>> differently: If nobarrier makes a difference skipping it is not safe. >> I do not fully understand that sentence, what do you mean by "makes a >> difference" and "skipping is not safe"? > The rule of thumb is: if nobarrier makes your workload run faster you > should not be using it, aka: don't use it. OK, thanks for clarification. Should the XFS FAQ be updated? *http://xfs.org/index.php/XFS_FAQ#Q._Should_barriers_be_enabled_with_storage_which_has_a_persistent_write_cache.3F