From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mailgw-02.dd24.net ([193.46.215.43]:56910 "EHLO mailgw-02.dd24.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753808AbbL3Tsj (ORCPT ); Wed, 30 Dec 2015 14:48:39 -0500 Message-ID: <1451504914.6350.12.camel@scientia.net> Subject: Re: [PATCH] BTRFS: Adds an option to select RAID Stripe size From: Christoph Anton Mitterer To: Qu Wenruo , Sanidhya Solanki Cc: David Sterba , clm@fb.com, jbacik@fb.com, linux-btrfs@vger.kernel.org Date: Wed, 30 Dec 2015 20:48:34 +0100 In-Reply-To: <5683E5E4.5010006@gmx.com> References: <1451305451-31222-1-git-send-email-jpage.lkml@gmail.com> <20151229133907.GA4227@suse.cz> <20151229061512.79a41f31@gmail.com> <20151229170611.GB4227@suse.cz> <20151230013946.7c1f0e12@gmail.com> <5683C714.4040705@gmx.com> <20151230045449.7a6c14db@gmail.com> <5683E5E4.5010006@gmx.com> Content-Type: multipart/signed; micalg="sha-512"; protocol="application/x-pkcs7-signature"; boundary="=-l6xPu5CQiV30df7NfiwM" Mime-Version: 1.0 Sender: linux-btrfs-owner@vger.kernel.org List-ID: --=-l6xPu5CQiV30df7NfiwM Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Wed, 2015-12-30 at 22:10 +0800, Qu Wenruo wrote: > Or, just don't touch it until there is really enough user demand. I definitely think that there is demand... as I've written previously, when I did some benchmarking tests (though on MD and HW raid) then depending on the RAID chunk size, one got different kind of IO patterns tuned. > (In stripe_len case, it's also a possible choice, as configurable > stripe=C2=A0 > length doesn't really affect much except RAID5/6) Sure about that? Admittedly I haven't checked it for the not parity RAIDs, but I'd expect that for the same reasons you get out different performance for sequential/random/vector reads/writes, you'd also get that more or less at least at RAID0. 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