From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 4A9A61B3F22; Mon, 9 Sep 2024 13:21:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725888086; cv=none; b=B+NZWJA3VAYHRaWY22QptSThs2ugE6W0TVdHTyHAPQ8E/cvNZGp0nBX+JL7In9ch89EV+CDGOfQITj18jjmVFUBs2rXbK1fKs3DiqP1/l6RYGLZmD8aLzYHjuSEsoGTEl2Gmp2SeOCFgvtpHEWNjmHYXFOQMcCl8UT/K/5P4oIY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1725888086; c=relaxed/simple; bh=wyRQUb/q9eHTl1vxYfPdfQ2cFjjyM6SHPgtqXugDeJQ=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=ViU8NupyESBBdwUY6bCdK13N0ciIhG1aPY7ilIrNUdSh+mx/MX+JuPyBdNTxDCaYwKlgBcprJyYU1tjd4bmEVw13oBehszQcuztsa/hIzRXu8XLU/vhyiR3VgNINPTDkxw/HAM2uVLo+j8n2aTWotDBBBnnZo4X9Nw5RMR6Av9M= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ttVmTxbb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="ttVmTxbb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id CF4C5C4CEC5; Mon, 9 Sep 2024 13:21:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1725888084; bh=wyRQUb/q9eHTl1vxYfPdfQ2cFjjyM6SHPgtqXugDeJQ=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=ttVmTxbb17rJ1kewLBBOB6qodut56iuWvmUS3MBB7qJeHa8S7gQsXz+wx++t9IAJg N01aQtcbRzAtJFfg3tPizEzPbc3hGT881Xk1Oq7FHoL0LK3ZJQKrIquYaxMuYZV/y2 TqWsxf2HBlA3EUFiLf2KQCwUVdlHCWtL1gUvqLTxbDzw9NHALfBZ10P881DUTGx1al WGtIxRgeZazBUa6eCQqqC33rkPpW0UunH3rK57rCoke33vqqAVF+hjTSxvxrQVBbdT iDMoxaQd8FqtDbF+dVrrGdOJ/atk7LOqZFs4KMbEw52cppHXn3EigXh6qTPMXVqJjP faX3a2KLxnw5g== Message-ID: <922e3d52-9567-4371-9a43-6d51f716a370@kernel.org> Date: Mon, 9 Sep 2024 22:21:22 +0900 Precedence: bulk X-Mailing-List: linux-block@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [bug report] block: Non-NCQ commands will never be executed while fio is continuously running To: yangxingui , axboe@kernel.dk, John Garry Cc: linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, James.Bottomley@HansenPartnership.com, "Martin K. Petersen" , damien.lemoal@opensource.wdc.com References: From: Damien Le Moal Content-Language: en-US Organization: Western Digital Research In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit On 9/9/24 22:10, yangxingui wrote: > Hello axboe & John, > > After the driver exposes all HW queues to the block layer, non-NCQ > commands will never be executed while fio is continuously running, such > as a smartctl command. > > The cause of the problem is that other hctx used by the NCQ command is > still active and can continue to issue NCQ commands to the sata disk. > And the pio command keeps retrying in its corresponding hctx because > qc_defer() always returns true. > > hctx0: ncq, pio, ncq > hctx1：ncq, ncq, ... > ... > hctxn: ncq, ncq, ... > > Is there any good solution for this? SATA devices are single queue so how can you have multiple queues ? What adapter are you using ? -- Damien Le Moal Western Digital Research