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=-2.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,MAILING_LIST_MULTI,SPF_HELO_NONE,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 A1BEDC31E4B for ; Fri, 14 Jun 2019 20:06:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 69C9921841 for ; Fri, 14 Jun 2019 20:06:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560542762; bh=6AW++I2KeuWsGHSu6JA6vMiNYLcuVsi2K4GLEIO/3+s=; h=Date:From:To:Cc:Subject:References:In-Reply-To:List-ID:From; b=ndcib7+xQty/rK0mbVl7dMETZ9AVeblZU58E4qDabe+Ix686z9iVpW4a98ssuY2aR KKtNXR0ov5e8yK1FhKquePnpYYCBod/3e1x5UZ3+HiMxoDX83MjpV1nn8jDxwlaUuY LAg9LzbbJHOMuxCO8OBAjKmz/xBQUYNaYst29KBU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725825AbfFNUGC (ORCPT ); Fri, 14 Jun 2019 16:06:02 -0400 Received: from mail.kernel.org ([198.145.29.99]:47812 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725802AbfFNUGB (ORCPT ); Fri, 14 Jun 2019 16:06:01 -0400 Received: from localhost (unknown [69.71.4.100]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 8DE252173C; Fri, 14 Jun 2019 20:06:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1560542761; bh=6AW++I2KeuWsGHSu6JA6vMiNYLcuVsi2K4GLEIO/3+s=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=G7iDYR2wO+22rp7C4sRG3HKb8Yvppfd8jh3xhLjUwkILhQmDU7qp3vOaNq41vX2Cp 4HVkTcnrDTNvvKawNN0V8EVYyXUqmMlx69rFLzuFgXyt1UMU8XGAezwPv22BvU1/0F cISsK9vDvwkmVLoQUzYeqmJDwceOSnNJu0aIb5j0= Date: Fri, 14 Jun 2019 15:05:57 -0500 From: Bjorn Helgaas To: Keith Busch Cc: Daniel Drake , Jens Axboe , Sagi Grimberg , Linux PCI , linux-nvme , Keith Busch , linux-ide@vger.kernel.org, Linux Upstreaming Team , Christoph Hellwig Subject: Re: [PATCH] PCI: Add Intel remapped NVMe device support Message-ID: <20190614200557.GS13533@google.com> References: <20190610074456.2761-1-drake@endlessm.com> <20190613085402.GC13442@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.10.1 (2018-07-13) Sender: linux-pci-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org On Fri, Jun 14, 2019 at 01:36:07PM -0600, Keith Busch wrote: > Even if you wish to forgo the standard features and management > capabilities, you're still having to deal with legacy IRQ, which has > IOPs at a fraction of the hardware's true capabilities when using MSI. > ... your best option is still to set to AHCI mode for Linux > for this reason alone, and vendors should be providing this option in > BIOS. Ugh. Are you saying the installation instructions for Linux will say "change the BIOS setting to AHCI"? That's an unpleasant user experience, especially if the installation fails if the user hasn't read the instructions. Bjorn