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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 885F2C7EE30 for ; Tue, 1 Jul 2025 16:19:44 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:In-Reply-To:Content-Type: MIME-Version:References:Message-ID:Subject:Cc:To:From:Date:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=UaSsrUzy9seTj8OP2xcgpOZ1U6zOtxVvROKZcmOw7D0=; b=TD943n1G/8xnKyw7eOkgucqpce RTLKNlN6+UE29yfmflaQt63soKU/CxdMCMbCmCXvoYcdAi9xYjZjnxQxpuufhONMuyqXJpYXMfAA0 Ou3iecdbcFyFkJZ30yW5ZOh/ti9vIvXFToZzJfoayO4ohF3lXr/oSIkUp9fnMM1Hgn/YYTmiTBi11 ft0Ya71hzRBqAg8ftsJJERBeeceHm1j8BM2Yt8zt0hjQ/PzsNW5KG0BAoyOLZPO0wvGu5z6UuKs5c E2iu+PKe9SXS0S6iFpwaAuzAywr6Z/127W3MvJyb3Tg8l8nZBdynpyOxLMRcvJM2/x2qqyW9JNYiE GotnEesQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1uWdht-000000060nE-2PEf; Tue, 01 Jul 2025 16:19:41 +0000 Received: from sea.source.kernel.org ([172.234.252.31]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1uWc5H-00000005j5U-1Q7Q for linux-nvme@lists.infradead.org; Tue, 01 Jul 2025 14:35:44 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id 16D4B4675E; Tue, 1 Jul 2025 14:35:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 6ABFAC4CEEB; Tue, 1 Jul 2025 14:35:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1751380543; bh=UaSsrUzy9seTj8OP2xcgpOZ1U6zOtxVvROKZcmOw7D0=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=WdKjGZGoE1XDiCYJrDe+/jUU1dJP9SWcsSMuV7GTl+N0Ujb8pSvwggRJ6u7HCAsG+ 9XEfzgU8mC5XETsCKRZ9fUCegXDDIIN++u2loglv17xZ9I8uzAu/WfJA7RHQ54U1rl LuK1zDYtCVe4smNtE2PQ5dM9FtU3PNdrs5rvJIheNK6Bz+Vw6YNi9qvOWVcvxyO8uK vC5A0cVzrQ+zZznOhmXHIQQojXMiFgDEZSpnu/sSWurF1bX5feFF96cDJNjBmvoFYo TL3HWiRoIhSQXNLDbKkI4059FWY1WO/PXOLDLAzOAI2bFIoQ85tEKyB0FFihOpUpfk +t3agqM3mgYGA== Date: Tue, 1 Jul 2025 10:35:39 -0400 From: Keith Busch To: Christoph Hellwig Cc: Keith Busch , linux-nvme@lists.infradead.org Subject: Re: [PATCH] nvme: uring_cmd specific request_queue for SGLs Message-ID: References: <20250625060915.GB9391@lst.de> <20250626051413.GC23248@lst.de> <20250627072524.GA1329@lst.de> <20250630060016.GA28775@lst.de> <20250701061609.GA17912@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250701_073543_398676_BF610FEE X-CRM114-Status: UNSURE ( 8.97 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-nvme@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On Tue, Jul 01, 2025 at 08:15:39AM -0400, Keith Busch wrote: > > But can they split commands such that they dispatch one per iovec > instead of as a single command? That can be done only if individual iovecs are block size aligned, which isn't always the case. Only the total size is guaranteed to be block size aligned.