From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_PASS,USER_AGENT_MUTT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7F6B1C43218 for ; Fri, 26 Apr 2019 09:46:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5BC072084F for ; Fri, 26 Apr 2019 09:46:22 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725935AbfDZJqV (ORCPT ); Fri, 26 Apr 2019 05:46:21 -0400 Received: from sauhun.de ([88.99.104.3]:51224 "EHLO pokefinder.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726413AbfDZJqO (ORCPT ); Fri, 26 Apr 2019 05:46:14 -0400 Received: from localhost (p5486CFAE.dip0.t-ipconnect.de [84.134.207.174]) by pokefinder.org (Postfix) with ESMTPSA id 1DB222C0114; Fri, 26 Apr 2019 11:46:12 +0200 (CEST) Date: Fri, 26 Apr 2019 11:46:11 +0200 From: Wolfram Sang To: Yoshihiro Shimoda Cc: ulf.hansson@linaro.org, wsa+renesas@sang-engineering.com, linux-mmc@vger.kernel.org, linux-renesas-soc@vger.kernel.org Subject: Re: [PATCH 0/3] mmc: renesas_sdhi_internal_dmac: improve performance by using IOMMU Message-ID: <20190426094611.GD1031@kunai> References: <1556255930-18188-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="11Y7aswkeuHtSBEs" Content-Disposition: inline In-Reply-To: <1556255930-18188-1-git-send-email-yoshihiro.shimoda.uh@renesas.com> User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-renesas-soc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org --11Y7aswkeuHtSBEs Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Hi Shimoda-san, thanks for working on this! > Please refer to the end of this email about the performance. Yes, nice improvements, great! > (I beleive if the performance is improved, the CPU load is also increased.) I do wonder about this a bit, though. IPMMU and DMA shouldn't be that much expensive for the CPU, or? Am I overlooking something? Kind regards, Wolfram --11Y7aswkeuHtSBEs Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQIzBAABCgAdFiEEOZGx6rniZ1Gk92RdFA3kzBSgKbYFAlzC018ACgkQFA3kzBSg Kba7FA//SgruITLzgUvYw5soiNosmBGO998qu3ayYk1D7qS+uaXfZg6toVTCcVVX fMfYHITBCzZukdyJDoOJnvvm+O1zqxqpzxvGkGnrvf0hbitny0HN4NMadnAjecpb jZGiE17LIY1NPkwCSlE14O8YxhXgiW3vsaOj9fXRg6LL/RRbe6ZuPgk9rKD500gH dp/IVhGXPoSMMZNR6esK8yIKHyt6Tm2iwkjSZM8mQAPMUtfviMfSOjykBOBn7cFj YAmA/xsCUMC2b0P/tijOVTik4hUV9/eJNoU815lQd9UecIfBPELGWnQqwPx2mhhB M7SrQs4DTP9kuwet7fymmGRRBFn6xYr4+z+N7ifZXzkS7vBDKPOS+nJ2l6ns+M18 831gN0u712Dqw00QzUlwZOjmbJjBMq+a/H0A6zxcwPSjxF/H9fgN9mVEnNCehS4Y UQZaQvyC8lXs7SMu85nl2mB6naelzyjNry7MfOiUKuBSahgq0J3cIOTfLEA7CKjl iYOePMNOFeAYzMMYopMAVHJbvjJmzdbvMqJAyMMNKmaOzgTbfEcoOoe/P/QB9tQC j1FrCpTyHROMhWNv5k9I1ccvHxsvNVrLajwJWWtkR33AImJE7YYL9dewjVgeXDqq Pj1wW0kOyxmnfQyzkuRUxpC3QLtIXhc/AfEqxer7chpcrCcA3qE= =RLPJ -----END PGP SIGNATURE----- --11Y7aswkeuHtSBEs--