From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759123AbcDAPs5 (ORCPT ); Fri, 1 Apr 2016 11:48:57 -0400 Received: from anholt.net ([50.246.234.109]:43198 "EHLO anholt.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753110AbcDAPsy (ORCPT ); Fri, 1 Apr 2016 11:48:54 -0400 From: Eric Anholt To: Stephen Warren Cc: linux-rpi-kernel@lists.infradead.org, Russell King , linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Lee Jones , Florian Fainelli Subject: Re: [PATCH 2/3] ARM: multi_v7_defconfig: Switch BCM2835 to sdhci-iproc.c for MMC In-Reply-To: <56FDD697.2050901@wwwdotorg.org> References: <1459470504-5007-1-git-send-email-eric@anholt.net> <1459470504-5007-2-git-send-email-eric@anholt.net> <56FDD697.2050901@wwwdotorg.org> User-Agent: Notmuch/0.21 (http://notmuchmail.org) Emacs/24.5.1 (x86_64-pc-linux-gnu) Date: Fri, 01 Apr 2016 08:48:49 -0700 Message-ID: <87h9flnxcu.fsf@eliezer.anholt.net> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="=-=-="; micalg=pgp-sha512; protocol="application/pgp-signature" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --=-=-= Content-Type: text/plain Content-Transfer-Encoding: quoted-printable Stephen Warren writes: > On 03/31/2016 06:28 PM, Eric Anholt wrote: >> This approximately triples write performance for the SD card. My card >> is too full of important data to collect very reliable numbers, but I >> see 271.361% +/- 166.742% improvement (n=3D3 before, 6 after), for 'dd >> if=3D/dev/zero of=3D/boot/asdf bs=3D1M count=3D3 oflag=3Ddsync,direct'. = Read >> performance appears to be unaffected. > > I thought that switching the defconfig wasn't possible, since this HW=20 > module relies on the SoC core clock, and that can be asynchronously=20 > changed by the FW running on the VideoCore. Consequently, this change=20 > isn't safe unless the user puts non-default options in their config.txt. > > The same comment applies to "[PATCH 1/4] ARM: bcm2835: Switch BCM2835 to= =20 > sdhci-iproc.c for MMC" in the other series. I think you're thinking of SDHOST, the other controller? This is just switching implementations for the EMMC controller so that eventually we can delete our old implementation. --=-=-= Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCgAGBQJW/phiAAoJELXWKTbR/J7oszwP/05pc7oZ0trpUy2hp/5ufV5i uV+lortrWo+pzl9h8fbHsOFJF1uIuZYKRfpnzxNMyeRtKHM5tZl3kUjzG0DEpqlB B2KDW9hTmk/dd6usz9q4HQN78yq3XehbExpF5NRNog6njpZxcPJqWH24X4cdb7Sa E8IUoj6NHhYKVe4c43FmSvoIh/Ba66iIjRyJjeMHqiXfouvokiw4bm3KwMeuWiet qUBX2GCXTiB432q0Wp0GT0UlQNx2gHPN3kKN01uWFle4CIZWRLgf5Qb/PVPATEGN 1yqeNVxJ6QpeVWnJnlj9oodQmKbspCuc+jVuSPpsARg4J8jQBauVU2cX9eRX2utv jIeuw7vX9ikfg4R2CZ6DK48jLg5m0vNokYp1K7JeCJhU2GNECBDEJFcW/XpbhL94 2WgTiGmWCv+2FMyIdw398ywzOdEvlSxW/4plyhXtH1CkcKVhbhvpn5U5aNgb7mVC YciLukfzllYcQ8LqJ7rmor1udZkwdRa1eVutOicZHVecXYMqh4WjFGY4ovs43trC J78sgGz+IiInqzKz/8nQKamErwbdYj/ZsNE/Ovd7lKVsWNprKcfV8eKCUZ13NnSw /7TmRTSEXaWdq2k3C1EqTUhi3jaZVBDZwAOPqsTvWSKvv/SdzVLA2oOMceEzjCGw I8pfsVGEFbdI3LR3qCI6 =aSet -----END PGP SIGNATURE----- --=-=-=--