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=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 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 0E92BC43603 for ; Fri, 20 Dec 2019 21:21:05 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D135D206DA for ; Fri, 20 Dec 2019 21:21:04 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="QXdHj7nG"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="rWWY0UW2" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D135D206DA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:MIME-Version:References: Message-ID:Subject:To:From:Date:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=lCMuL/E7O4NGq97Ms2o2/1ycg+7tz9jJGDk+QzJnPuU=; b=QXdHj7nG5b7UwH WwCpbG2mzU5QZXB7DcU1u3FI/7LtzwghbH90kzY2X0V4++uFEox8e4eWOMHLuKYA6EG9iFgHjYh9p 1t7YgCThSUUuRLWFY7DeSjCf/qyRUSl06v2enZLczVRM0+lFM9fly0PTtEL9GcGq3zFlxDZ4Hu4EK 6gX3KPUHJ6W0JTZ9nZDU17uVXqlYbwGxoE+bM5fvfnzsFIu2bjEaQfdCCQ/YfHb82k4xA5Lgu4rvs jleIY9I039nQgD2YEJubc6DW42cVGmwHEuIN4Aegn76Vn2+0+DlHVm85Bj0ZeAHFqDMxUtfMiUhxs 1BApIy+BdrFiSgTNL3sQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1iiPhk-0008K7-5m; Fri, 20 Dec 2019 21:21:00 +0000 Received: from mail.kernel.org ([198.145.29.99]) by bombadil.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1iiPhg-0008JP-Mb for linux-nvme@lists.infradead.org; Fri, 20 Dec 2019 21:20:57 +0000 Received: from redsun51.ssa.fujisawa.hgst.com (unknown [199.255.47.7]) (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 A3AF02146E; Fri, 20 Dec 2019 21:20:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1576876855; bh=yGg5OlUqc48W/wvYsM0UnmokbFwFG5mhnif2M8frODU=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=rWWY0UW2sFFIBtlkukfagk7PdXSlhHtKkyDbmN0b7MlVVaPBN978xsJ77maOc5+h1 zVfm2zAtRKL4MQhZmbqbtcHmYyG4LkE1kE8h/KV2mhe6tE4b8ByzgApeesSeq2/RE7 yFZy3wqZzchXnF7KcDZWUkhm7HkMaNg5GSwoO/1U= Date: Sat, 21 Dec 2019 06:20:49 +0900 From: Keith Busch To: "Ober, Frank" Subject: Re: Polled io for Linux kernel 5.x Message-ID: <20191220212049.GA5582@redsun51.ssa.fujisawa.hgst.com> References: <20191219205210.GA26490@redsun51.ssa.fujisawa.hgst.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.12.1 (2019-06-15) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191220_132056_759340_D401EB73 X-CRM114-Status: UNSURE ( 8.32 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "linux-block@vger.kernel.org" , "Rajendiran, Swetha" , "Liang, Mark" , "Derrick, Jonathan" , "linux-nvme@lists.infradead.org" Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Thu, Dec 19, 2019 at 09:59:14PM +0000, Ober, Frank wrote: > Thanks Keith, it makes sense to reserve and set it up uniquely if you > can save hw interrupts. But why would io_uring then not need these > queues, because a stack trace I ran shows without the special queues I > am still entering bio_poll. With pvsync2 I can only do polled io with > the poll_queues? Polling can happen only if you have polled queues, so io_uring is not accomplishing anything by calling iopoll. I don't see an immediately good way to pass that information up to io_uring, though. _______________________________________________ linux-nvme mailing list linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme