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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 268DDC0018C for ; Mon, 7 Dec 2020 18:27:28 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DC403238E5 for ; Mon, 7 Dec 2020 18:27:27 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725901AbgLGS1M (ORCPT ); Mon, 7 Dec 2020 13:27:12 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48946 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725781AbgLGS1M (ORCPT ); Mon, 7 Dec 2020 13:27:12 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0709DC061749; Mon, 7 Dec 2020 10:26:32 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=plmldp0jMUbXn4RHhveXniPRGIKOxbNYBpy4Qnxa4iU=; b=ETlnj0o86z0HzG7k/Ffy4FpKV+ RxD8HXZnMz7KUNPRGl7hUGWACsCjXPKCHTT8HfIIfvZqkOU8rDDB3ZJJ5RV3SFZuLv5drFrL5TcUp 6NmXC9XhlQjgBHmScaJOHYmXBPwS4BWhjHb7TTbLkx9R9Nir0+TSuabkb/Pz1VUXRtBICsXR3t/LF w1IJIcurUZehi4FKxZ20tfFPQHPEWwYQp7nwNo2E2HQ0DU3at6SLTaoDz9hPQR5kNXiEQIZRU0WO9 +R8MM5ljxy4Qqyq3A3/CPAX4z74PdAYi/Bjxar4zvAo94ARI2YcMNLiK1R9r6F8Utlq0xgLEolvys LSajCCqw==; Received: from hch by casper.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1kmLD1-0000sh-TN; Mon, 07 Dec 2020 18:26:03 +0000 Date: Mon, 7 Dec 2020 18:26:03 +0000 From: Christoph Hellwig To: Greg KH Cc: Christoph Hellwig , Daejun Park , "avri.altman@wdc.com" , "jejb@linux.ibm.com" , "martin.petersen@oracle.com" , "asutoshd@codeaurora.org" , "beanhuo@micron.com" , "stanley.chu@mediatek.com" , "cang@codeaurora.org" , "bvanassche@acm.org" , "tomas.winkler@intel.com" , ALIM AKHTAR , "gregkh@google.com" , "linux-scsi@vger.kernel.org" , "linux-kernel@vger.kernel.org" , Sang-yoon Oh , Sung-Jun Park , yongmyung lee , Jinyoung CHOI , Adel Choi , BoRam Shin , SEUNGUK SHIN Subject: Re: [PATCH v13 0/3] scsi: ufs: Add Host Performance Booster Support Message-ID: <20201207182603.GA2499@infradead.org> References: <2038148563.21604378702426.JavaMail.epsvc@epcpadp3> <20201207180655.GA30657@infradead.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org On Mon, Dec 07, 2020 at 07:23:12PM +0100, Greg KH wrote: > What "real workload" test can be run on this to help show if it is > useful or not? These vendors seem to think it helps for some reason, > otherwise they wouldn't have added it to their silicon :) > > Should they run fio? If so, any hints on a config that would be good to > show any performance increases? A real actual workload that matters. Then again that was Martins request to even justify it. I don't think the broken addressing that breaks a whole in the SCSI addressing has absolutely not business being supported in Linux ever. The vendors should have thought about the design before committing transistors to something that fundamentally does not make sense.