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=-5.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,MENTIONS_GIT_HOSTING,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 1E3BFC76186 for ; Wed, 17 Jul 2019 11:31:32 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id F3FEA20880 for ; Wed, 17 Jul 2019 11:31:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726934AbfGQLan (ORCPT ); Wed, 17 Jul 2019 07:30:43 -0400 Received: from mx1.redhat.com ([209.132.183.28]:46532 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725873AbfGQLam (ORCPT ); Wed, 17 Jul 2019 07:30:42 -0400 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 3449BC18B2CC; Wed, 17 Jul 2019 11:30:42 +0000 (UTC) Received: from steredhat.redhat.com (ovpn-116-100.ams2.redhat.com [10.36.116.100]) by smtp.corp.redhat.com (Postfix) with ESMTP id 68C215C257; Wed, 17 Jul 2019 11:30:31 +0000 (UTC) From: Stefano Garzarella To: netdev@vger.kernel.org Cc: linux-kernel@vger.kernel.org, Stefan Hajnoczi , "David S. Miller" , virtualization@lists.linux-foundation.org, Jason Wang , kvm@vger.kernel.org, "Michael S. Tsirkin" Subject: [PATCH v4 0/5] vsock/virtio: optimizations to increase the throughput Date: Wed, 17 Jul 2019 13:30:25 +0200 Message-Id: <20190717113030.163499-1-sgarzare@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.31]); Wed, 17 Jul 2019 11:30:42 +0000 (UTC) Sender: kvm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org This series tries to increase the throughput of virtio-vsock with slight changes. While I was testing the v2 of this series I discovered an huge use of memory, so I added patch 1 to mitigate this issue. I put it in this series in order to better track the performance trends. v4: - rebased all patches on current master (conflicts is Patch 4) - Patch 1: added Stefan's R-b - Patch 3: removed lock when buf_alloc is written [David]; moved this patch after "vsock/virtio: reduce credit update messages" to make it clearer - Patch 4: vhost_exceeds_weight() is recently introduced, so I've solved some conflicts v3: https://patchwork.kernel.org/cover/10970145 v2: https://patchwork.kernel.org/cover/10938743 v1: https://patchwork.kernel.org/cover/10885431 Below are the benchmarks step by step. I used iperf3 [1] modified with VSOCK support. As Micheal suggested in the v1, I booted host and guest with 'nosmap'. A brief description of patches: - Patches 1: limit the memory usage with an extra copy for small packets - Patches 2+3: reduce the number of credit update messages sent to the transmitter - Patches 4+5: allow the host to split packets on multiple buffers and use VIRTIO_VSOCK_MAX_PKT_BUF_SIZE as the max packet size allowed host -> guest [Gbps] pkt_size before opt p 1 p 2+3 p 4+5 32 0.032 0.030 0.048 0.051 64 0.061 0.059 0.108 0.117 128 0.122 0.112 0.227 0.234 256 0.244 0.241 0.418 0.415 512 0.459 0.466 0.847 0.865 1K 0.927 0.919 1.657 1.641 2K 1.884 1.813 3.262 3.269 4K 3.378 3.326 6.044 6.195 8K 5.637 5.676 10.141 11.287 16K 8.250 8.402 15.976 16.736 32K 13.327 13.204 19.013 20.515 64K 21.241 21.341 20.973 21.879 128K 21.851 22.354 21.816 23.203 256K 21.408 21.693 21.846 24.088 512K 21.600 21.899 21.921 24.106 guest -> host [Gbps] pkt_size before opt p 1 p 2+3 p 4+5 32 0.045 0.046 0.057 0.057 64 0.089 0.091 0.103 0.104 128 0.170 0.179 0.192 0.200 256 0.364 0.351 0.361 0.379 512 0.709 0.699 0.731 0.790 1K 1.399 1.407 1.395 1.427 2K 2.670 2.684 2.745 2.835 4K 5.171 5.199 5.305 5.451 8K 8.442 8.500 10.083 9.941 16K 12.305 12.259 13.519 15.385 32K 11.418 11.150 11.988 24.680 64K 10.778 10.659 11.589 35.273 128K 10.421 10.339 10.939 40.338 256K 10.300 9.719 10.508 36.562 512K 9.833 9.808 10.612 35.979 As Stefan suggested in the v1, I measured also the efficiency in this way: efficiency = Mbps / (%CPU_Host + %CPU_Guest) The '%CPU_Guest' is taken inside the VM. I know that it is not the best way, but it's provided for free from iperf3 and could be an indication. host -> guest efficiency [Mbps / (%CPU_Host + %CPU_Guest)] pkt_size before opt p 1 p 2+3 p 4+5 32 0.35 0.45 0.79 1.02 64 0.56 0.80 1.41 1.54 128 1.11 1.52 3.03 3.12 256 2.20 2.16 5.44 5.58 512 4.17 4.18 10.96 11.46 1K 8.30 8.26 20.99 20.89 2K 16.82 16.31 39.76 39.73 4K 30.89 30.79 74.07 75.73 8K 53.74 54.49 124.24 148.91 16K 80.68 83.63 200.21 232.79 32K 132.27 132.52 260.81 357.07 64K 229.82 230.40 300.19 444.18 128K 332.60 329.78 331.51 492.28 256K 331.06 337.22 339.59 511.59 512K 335.58 328.50 331.56 504.56 guest -> host efficiency [Mbps / (%CPU_Host + %CPU_Guest)] pkt_size before opt p 1 p 2+3 p 4+5 32 0.43 0.43 0.53 0.56 64 0.85 0.86 1.04 1.10 128 1.63 1.71 2.07 2.13 256 3.48 3.35 4.02 4.22 512 6.80 6.67 7.97 8.63 1K 13.32 13.31 15.72 15.94 2K 25.79 25.92 30.84 30.98 4K 50.37 50.48 58.79 59.69 8K 95.90 96.15 107.04 110.33 16K 145.80 145.43 143.97 174.70 32K 147.06 144.74 146.02 282.48 64K 145.25 143.99 141.62 406.40 128K 149.34 146.96 147.49 489.34 256K 156.35 149.81 152.21 536.37 512K 151.65 150.74 151.52 519.93 [1] https://github.com/stefano-garzarella/iperf/ Stefano Garzarella (5): vsock/virtio: limit the memory used per-socket vsock/virtio: reduce credit update messages vsock/virtio: fix locking in virtio_transport_inc_tx_pkt() vhost/vsock: split packets to send using multiple buffers vsock/virtio: change the maximum packet size allowed drivers/vhost/vsock.c | 68 ++++++++++++----- include/linux/virtio_vsock.h | 4 +- net/vmw_vsock/virtio_transport.c | 1 + net/vmw_vsock/virtio_transport_common.c | 99 ++++++++++++++++++++----- 4 files changed, 134 insertions(+), 38 deletions(-) -- 2.20.1