On Tue, Jul 30, 2019 at 05:43:29PM +0200, Stefano Garzarella wrote: > 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. > > v5: > - rebased all patches on net-next > - added Stefan's R-b and Michael's A-b This doesn't solve all issues around allocation - as I mentioned I think we will need to improve accounting for that, and maybe add pre-allocation. But it's a great series of steps in the right direction! > v4: https://patchwork.kernel.org/cover/11047717 > 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 Michael 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
