Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753668AbaAWNNP (ORCPT ); Thu, 23 Jan 2014 08:13:15 -0500 Received: from smtp02.citrix.com ([66.165.176.63]:59364 "EHLO SMTP02.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752888AbaAWNNL (ORCPT ); Thu, 23 Jan 2014 08:13:11 -0500 X-IronPort-AV: E=Sophos;i="4.95,706,1384300800"; d="scan'208";a="93674915" Message-ID: <52E11563.1090707@citrix.com> Date: Thu, 23 Jan 2014 13:13:07 +0000 From: Zoltan Kiss User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:24.0) Gecko/20100101 Thunderbird/24.2.0 MIME-Version: 1.0 To: David Miller CC: , , , , , , "xen-devel@lists.xenproject.org" Subject: Re: [PATCH net-next v5 0/9] xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy References: <1390253069-25507-1-git-send-email-zoltan.kiss@citrix.com> <20140122.175031.873909526743971037.davem@davemloft.net> In-Reply-To: <20140122.175031.873909526743971037.davem@davemloft.net> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.80.2.133] X-DLP: MIA2 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 23/01/14 01:50, David Miller wrote: > From: Zoltan Kiss > Date: Mon, 20 Jan 2014 21:24:20 +0000 > >> A long known problem of the upstream netback implementation that on the TX >> path (from guest to Dom0) it copies the whole packet from guest memory into >> Dom0. That simply became a bottleneck with 10Gb NICs, and generally it's a >> huge perfomance penalty. The classic kernel version of netback used grant >> mapping, and to get notified when the page can be unmapped, it used page >> destructors. Unfortunately that destructor is not an upstreamable solution. >> Ian Campbell's skb fragment destructor patch series [1] tried to solve this >> problem, however it seems to be very invasive on the network stack's code, >> and therefore haven't progressed very well. >> This patch series use SKBTX_DEV_ZEROCOPY flags to tell the stack it needs to >> know when the skb is freed up. > > This series does not apply to net-next due to some other recent changes. > > Please respin, thanks. It is already based on two predecessor patches, one which is already accepted but not applied yet: [PATCH net-next v2] xen-netback: Rework rx_work_todo And the other one is hopefully will be accepted very soon: [PATCH v5] xen/grant-table: Avoid m2p_override during mapping Zoli -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/