I am having an almost identical issue with Ubuntu 20.04, kernel 5.4.0-40-generic. I believe it is related to the ethernet driver. I have two almost identical computers, both running 5.4.0-40. The bad one has the following driver:
eth0: RTL8168h/8111h, 00:e4:4f:68:0e:77, XID 541, IRQ 126 On this computer, I see hundreds of increments to "rx_missed" every second while trying to do high-speed transfers to WAN hosts with high latency. Due to all the TCP segment losses, the TCP window never fully opens and bandwidth is poor (about 20 megabits on a 1gbps connection). Transfers on the same LAN happen at 1gbps, presumably because the latency is so low that the re-tx happens quickly. Sitting next to it, on the same LAN, is a "good" computer -- virtually identical except the Ethernet chipset. It is also running 5.4.0-40, but with a different driver: eth0: RTL8168evl/8111evl, 00:e0:4c:68:04:7d, XID 2c9, IRQ 126 On this good computer, I see no rx_missed increments even after hundreds of gigabytes of transfers. TCP happens at near wire speed even to WAN hosts. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1880076 Title: ubuntu 20.4 - retransmitts with r8169 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1880076/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
