Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754501AbaAHAK5 (ORCPT ); Tue, 7 Jan 2014 19:10:57 -0500 Received: from smtp.citrix.com ([66.165.176.89]:9940 "EHLO SMTP.CITRIX.COM" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752555AbaAHAKy (ORCPT ); Tue, 7 Jan 2014 19:10:54 -0500 X-IronPort-AV: E=Sophos;i="4.95,621,1384300800"; d="scan'208";a="90699151" From: Zoltan Kiss To: , , , , , CC: Zoltan Kiss Subject: [PATCH net-next v2 0/9] xen-netback: TX grant mapping with SKBTX_DEV_ZEROCOPY instead of copy Date: Wed, 8 Jan 2014 00:10:09 +0000 Message-ID: <1389139818-24458-1-git-send-email-zoltan.kiss@citrix.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain X-Originating-IP: [10.80.2.133] X-DLP: MIA1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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. That is the way KVM solved the same problem, and based on my initial tests it can do the same for us. Avoiding the extra copy boosted up TX throughput from 6.8 Gbps to 7.9 (I used a slower Interlagos box, both Dom0 and guest on upstream kernel, on the same NUMA node, running iperf 2.0.5, and the remote end was a bare metal box on the same 10Gb switch) Based on my investigations the packet get only copied if it is delivered to Dom0 stack, which is due to this [2] patch. That's a bit unfortunate, but luckily it doesn't cause a major regression for this usecase. In the future we should try to eliminate that copy somehow. There are a few spinoff tasks which will be addressed in separate patches: - grant copy the header directly instead of map and memcpy. This should help us avoiding TLB flushing - use something else than ballooned pages - fix grant map to use page->index properly I will run some more extensive tests, but some basic XenRT tests were already passed with good results. I've tried to broke it down to smaller patches, with mixed results, so I welcome suggestions on that part as well: 1: Introduce TX grant map definitions 2: Change TX path from grant copy to mapping 3: Remove old TX grant copy definitons and fix indentations 4: Change RX path for mapped SKB fragments 5: Add stat counters for zerocopy 6: Handle guests with too many frags 7: Add stat counters for frag_list skbs 8: Timeout packets in RX path 9: Aggregate TX unmap operations v2: I've fixed some smaller things, see the individual patches. I've added a few new stat counters, and handling the important use case when an older guest sends lots of slots. Instead of delayed copy now we timeout packets on the RX path, based on the assumption that otherwise packets should get stucked anywhere else. Finally some unmap batching to avoid too much TLB flush v3: Apart from fixing a few things mentioned in responses the important change is the use the hypercall directly for grant [un]mapping, therefore we can avoid m2p override. [1] http://lwn.net/Articles/491522/ [2] https://lkml.org/lkml/2012/7/20/363 Signed-off-by: Zoltan Kiss -- 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/