Em seg, 2024-07-22 às 14:54 +0100, Robert Swindells escreveu: > matth...@fastmai.us wrote: > > May I have some help troubleshooting poor network performance? I have > > an older laptop (Thinkpad 13) with a USB-C Ethernet dongle that attaches > > as ure0 as it has no builtin Ethernet port. I'm running NetBSD 10.0 > > STABLE built locally from a couple of days ago. > > > $ ifconfig ure0 > > ure0: flags=0x8843<UP,BROADCAST,RUNNING,SIMPLEX,MULTICAST> mtu 1500 > > capabilities=0x3ff00<IP4CSUM_Rx,IP4CSUM_Tx,TCP4CSUM_Rx,TCP4CSUM_Tx> > > > > capabilities=0x3ff00<UDP4CSUM_Rx,UDP4CSUM_Tx,TCP6CSUM_Rx,TCP6CSUM_Tx> > > capabilities=0x3ff00<UDP6CSUM_Rx,UDP6CSUM_Tx> > > enabled=0 > > You could enable HW checksumming. > > As a comparison, on a Thinkpad T495S running -current with an axen(4) > device connected to USB-C all HW checksum options enabled: > > % iperf3 -c 192.168.0.2 > Connecting to host 192.168.0.2, port 5201 > [ 5] local 192.168.0.37 port 65534 connected to 192.168.0.2 port 5201 > [ ID] Interval Transfer Bitrate Retr Cwnd > [ 5] 0.00-1.00 sec 91.2 MBytes 764 Mbits/sec 0 2.00 MBytes > [ 5] 1.00-2.01 sec 91.4 MBytes 759 Mbits/sec 0 2.00 MBytes > [ 5] 2.01-3.01 sec 89.9 MBytes 754 Mbits/sec 0 2.00 MBytes > [ 5] 3.01-4.01 sec 89.9 MBytes 754 Mbits/sec 0 318 KBytes > [ 5] 4.01-5.01 sec 89.8 MBytes 753 Mbits/sec 0 297 KBytes > [ 5] 5.01-6.01 sec 89.9 MBytes 754 Mbits/sec 0 256 KBytes > [ 5] 6.01-7.01 sec 89.8 MBytes 753 Mbits/sec 0 208 KBytes > [ 5] 7.01-8.01 sec 89.6 MBytes 752 Mbits/sec 0 144 KBytes > [ 5] 8.01-9.01 sec 89.9 MBytes 754 Mbits/sec 0 373 KBytes > [ 5] 9.01-10.01 sec 89.8 MBytes 753 Mbits/sec 0 339 KBytes > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bitrate Retr > [ 5] 0.00-10.01 sec 901 MBytes 755 Mbits/sec 0 sender > [ 5] 0.00-10.01 sec 901 MBytes 754 Mbits/sec receiver > > With TSO4 enabled as well (which your adaptor won't do): > > % iperf3 -c 192.168.0.2 > Connecting to host 192.168.0.2, port 5201 > [ 5] local 192.168.0.37 port 65532 connected to 192.168.0.2 port 5201 > [ ID] Interval Transfer Bitrate Retr Cwnd > [ 5] 0.00-1.00 sec 112 MBytes 943 Mbits/sec 0 2.00 MBytes > [ 5] 1.00-2.01 sec 114 MBytes 943 Mbits/sec 0 2.00 MBytes > [ 5] 2.01-3.01 sec 112 MBytes 942 Mbits/sec 0 2.00 MBytes > [ 5] 3.01-4.01 sec 112 MBytes 941 Mbits/sec 0 250 KBytes > [ 5] 4.01-5.01 sec 112 MBytes 942 Mbits/sec 0 622 KBytes > [ 5] 5.01-6.01 sec 112 MBytes 942 Mbits/sec 0 844 KBytes > [ 5] 6.01-7.01 sec 112 MBytes 942 Mbits/sec 0 1018 KBytes > [ 5] 7.01-8.01 sec 112 MBytes 943 Mbits/sec 0 1.14 MBytes > [ 5] 8.01-9.01 sec 112 MBytes 942 Mbits/sec 0 1.27 MBytes > [ 5] 9.01-10.01 sec 112 MBytes 942 Mbits/sec 0 181 KBytes > - - - - - - - - - - - - - - - - - - - - - - - - - > [ ID] Interval Transfer Bitrate Retr > [ 5] 0.00-10.01 sec 1.10 GBytes 942 Mbits/sec 0 sender > [ 5] 0.00-10.01 sec 1.10 GBytes 942 Mbits/sec receiver > > I don't think there is anything wrong with the USB or TCP/IP stacks. > > What is at the other end of your cable? > > One cause of really slow network performance can be a mismatch in full/half > duplex negotiation between the two devices
In my system running on a small desktop amd64 on celeron with ONE ethernet and another NIC on usb... runs very goot UNTIL you try to execute tcpdump -n -i ure0 the system panics, reboot and go ready in less than 30 sec. > .
