A quick check on a Trusty Guest modified from the uvt default of virtio to use rtl8139 and then moving into the kernel that is likely the reason shows me this for a trivial 1 connection duplex iperf streaming load to the Host:
Release Nettype Kernel - Result 1. 14.04 virtio 3.13.0-116 - ~11 + 8 GBits/s 2. 14.04 rtl8139 3.13.0-116 - 124 + 824 Mbits/s 3. 14.04 rtl8139 4.4.0-72 - 758 + 703 MBits/s 4. 14.04 rtl8139 4.4.0-72 - 115 + 795 MBits/s Notes: On #2: I already see 13k receive drops here on #3: I can confirm TSO, GSO, SG and IP Checksum offloads on as expected, they help to speed up my load despite now seeing 26k receive drops On #4: slow again back to ~14k drops Note: disabling offloads via: $ sudo ethtool -K eth0 tx-tcp-segmentation off $ sudo ethtool -K eth0 tx-checksum-ipv4 off $ sudo ethtool -K eth0 tx-scatter-gather off There is quite a chance that the generally much better behavior of enabling those offloads for your specific case it is a drawback. In that case please check with the disabling of the offloads and help to clarify the details I asked for. Yet overall IMHO - as I stated in my first comment - I'd strongly vote to use the virtio driver and be much faster than any rtl8139 based network would be. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1682681 Title: qemu 2.5 network model rtl8139 collisions Ubuntu 16.04.2 LTS To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/qemu/+bug/1682681/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
