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 smtp1.osuosl.org (smtp1.osuosl.org [140.211.166.138]) (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 2905BC433EF for ; Tue, 1 Mar 2022 11:53:49 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp1.osuosl.org (Postfix) with ESMTP id DF6F98123F; Tue, 1 Mar 2022 11:53:48 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp1.osuosl.org ([127.0.0.1]) by localhost (smtp1.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 6KtaBky-LexV; Tue, 1 Mar 2022 11:53:48 +0000 (UTC) Received: from lists.linuxfoundation.org (lf-lists.osuosl.org [IPv6:2605:bc80:3010:104::8cd3:938]) by smtp1.osuosl.org (Postfix) with ESMTPS id E3E0A8124A; Tue, 1 Mar 2022 11:53:47 +0000 (UTC) Received: from lf-lists.osuosl.org (localhost [127.0.0.1]) by lists.linuxfoundation.org (Postfix) with ESMTP id B768AC0077; Tue, 1 Mar 2022 11:53:47 +0000 (UTC) Received: from smtp3.osuosl.org (smtp3.osuosl.org [IPv6:2605:bc80:3010::136]) by lists.linuxfoundation.org (Postfix) with ESMTP id 5490FC001A for ; Tue, 1 Mar 2022 11:53:46 +0000 (UTC) Received: from localhost (localhost [127.0.0.1]) by smtp3.osuosl.org (Postfix) with ESMTP id 34D0F60B1E for ; Tue, 1 Mar 2022 11:53:46 +0000 (UTC) X-Virus-Scanned: amavisd-new at osuosl.org Received: from smtp3.osuosl.org ([127.0.0.1]) by localhost (smtp3.osuosl.org [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id CE8xNGrSLOJe for ; Tue, 1 Mar 2022 11:53:45 +0000 (UTC) X-Greylist: from auto-whitelisted by SQLgrey-1.8.0 Received: from verein.lst.de (verein.lst.de [213.95.11.211]) by smtp3.osuosl.org (Postfix) with ESMTPS id A67DA60761 for ; Tue, 1 Mar 2022 11:53:45 +0000 (UTC) Received: by verein.lst.de (Postfix, from userid 2407) id BD48368AFE; Tue, 1 Mar 2022 12:53:40 +0100 (CET) Date: Tue, 1 Mar 2022 12:53:40 +0100 From: Christoph Hellwig To: Tianyu Lan Subject: Re: [PATCH V2 1/2] Swiotlb: Add swiotlb_alloc_from_low_pages switch Message-ID: <20220301115340.GA3077@lst.de> References: <20220214081919.GA18337@lst.de> <4f433f07-05be-f81f-43e8-55c3f1af23b3@gmail.com> <20220214135834.GA30150@lst.de> <8d052867-ccff-f00f-7c89-cc26a4bfa347@gmail.com> <23f4a64d-5977-1816-8faa-fe7691ace2ff@gmail.com> <20220222080543.GA5412@lst.de> <00112505-4999-ac41-877e-49c4cc45312e@gmail.com> <20220222160039.GA13380@lst.de> <40f91949-58fa-4be2-5b01-ea34dda58670@gmail.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.5.17 (2007-11-01) Cc: linux-hyperv@vger.kernel.org, brijesh.singh@amd.com, dave.hansen@linux.intel.com, hpa@zytor.com, kys@microsoft.com, wei.liu@kernel.org, sthemmin@microsoft.com, x86@kernel.org, decui@microsoft.com, michael.h.kelley@microsoft.com, mingo@redhat.com, parri.andrea@gmail.com, thomas.lendacky@amd.com, Tianyu Lan , konrad.wilk@oracle.com, haiyangz@microsoft.com, bp@alien8.de, "krish.sadhukhan@oracle.com" , tglx@linutronix.de, linux-kernel@vger.kernel.org, iommu@lists.linux-foundation.org, vkuznets@redhat.com, robin.murphy@arm.com, "kirill.shutemov@linux.intel.com" X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On Fri, Feb 25, 2022 at 10:28:54PM +0800, Tianyu Lan wrote: > One more perspective is that one device may have multiple queues and > each queues should have independent swiotlb bounce buffer to avoid spin > lock overhead. The number of queues is only available in the device > driver. This means new API needs to be called in the device driver > according to queue number. Well, given how hell bent people are on bounce buffering we might need some scalability work there anyway. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu