In addition you can try to set kernel command line parameter pcie_aspm=off. Or set pcie_aspm.policy=performance.
In general it's a tradeoff: Older kernels didn't allow to enable ASPM at all, resulting in less battery life on notebooks. Newer kernels disable ASPM per default, but allow to re-enable it via sysfs. For this however they depend on proper BIOS support. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1880076 Title: ubuntu 20.4 - retransmitts with r8169 Status in linux package in Ubuntu: Incomplete Bug description: Hi, i run some network-tests (iperf3) and noticed massive retransmitts in ubuntu 20.4 with kernel 5.4.0-29. I'm using module r8169 for network- adapter 03:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411 PCI Express Gigabit Ethernet Controller (rev 15) if i boot my ubuntu 18.4 and did same iperf-test (same hardware, same network configuration, other client is not rebooted) i have not these retransmitts. root@bpi-r2:~# iperf3 -c 192.168.0.21 Connecting to host 192.168.0.21, port 5201 [ 5] local 192.168.0.11 port 35702 connected to 192.168.0.21 port 5201 [ ID] Interval Transfer Bitrate Retr Cwnd [ 5] 0.00-1.00 sec 14.2 MBytes 119 Mbits/sec 337 14.1 KBytes [ 5] 1.00-2.00 sec 14.9 MBytes 125 Mbits/sec 331 14.1 KBytes [ 5] 2.00-3.00 sec 15.1 MBytes 126 Mbits/sec 296 19.8 KBytes [ 5] 3.00-4.00 sec 14.7 MBytes 124 Mbits/sec 314 14.1 KBytes [ 5] 4.00-5.00 sec 12.8 MBytes 107 Mbits/sec 259 14.1 KBytes [ 5] 5.00-6.01 sec 67.4 MBytes 560 Mbits/sec 137 362 KBytes [ 5] 6.01-7.00 sec 111 MBytes 940 Mbits/sec 0 366 KBytes [ 5] 7.00-8.00 sec 112 MBytes 941 Mbits/sec 0 409 KBytes [ 5] 8.00-9.00 sec 112 MBytes 940 Mbits/sec 0 421 KBytes [ 5] 9.00-10.00 sec 112 MBytes 936 Mbits/sec 0 426 KBytes - - - - - - - - - - - - - - - - - - - - - - - - - [ ID] Interval Transfer Bitrate Retr [ 5] 0.00-10.00 sec 586 MBytes 491 Mbits/sec 1674 sender [ 5] 0.00-10.01 sec 585 MBytes 491 Mbits/sec receiver iperf Done. 2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000 link/ether e4:b9:7a:f7:c4:8b brd ff:ff:ff:ff:ff:ff inet 192.168.0.21/24 brd 192.168.0.255 scope global dynamic noprefixroute enp3s0 valid_lft 171856sec preferred_lft 171856sec inet6 fe80::781a:829f:5030:ad6a/64 scope link noprefixroute valid_lft forever preferred_lft forever $ ethtool -S enp3s0 NIC statistics: tx_packets: 571053 rx_packets: 1184934 tx_errors: 0 rx_errors: 0 rx_missed: 1919 <<<<<<<<<<<<<<<<<<<<<<<<<<< align_errors: 0 tx_single_collisions: 0 tx_multi_collisions: 0 unicast: 1184926 broadcast: 6 multicast: 2 tx_aborted: 0 tx_underrun: 0 2: enp3s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP mode DEFAULT group default qlen 1000 link/ether e4:b9:7a:f7:c4:8b brd ff:ff:ff:ff:ff:ff RX: bytes packets errors dropped overrun mcast 1785166133 1184970 0 0 0 2 TX: bytes packets errors dropped carrier collsns 39395440 570500 0 0 0 0 on the other side i see dropped packets, maybe flowcontrol-related? ethtool reports "Link partner advertised pause frame use: Symmetric" but maybe flowcontrol is not working... also driver reports flowcontrol is enabled... $ dmesg | grep r8169 [ 0.939358] libphy: r8169: probed [ 0.939491] r8169 0000:03:00.0 eth0: RTL8168h/8111h, e4:b9:7a:f7:c4:8b, XID 541, IRQ 128 [ 0.939492] r8169 0000:03:00.0 eth0: jumbo features [frames: 9200 bytes, tx checksumming: ko] [ 0.986853] r8169 0000:03:00.0 enp3s0: renamed from eth0 [ 3.478981] Generic FE-GE Realtek PHY r8169-300:00: attached PHY driver [Generic FE-GE Realtek PHY] (mii_bus:phy_addr=r8169-300:00, irq=IGNORE) [ 3.591124] r8169 0000:03:00.0 enp3s0: Link is Down [ 7.171198] r8169 0000:03:00.0 enp3s0: Link is Up - 1Gbps/Full - flow control rx/tx ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-29-generic 5.4.0-29.33 ProcVersionSignature: Ubuntu 5.4.0-29.33-generic 5.4.30 Uname: Linux 5.4.0-29-generic x86_64 ApportVersion: 2.20.11-0ubuntu27 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: frank 1427 F.... pulseaudio CasperMD5CheckResult: skip CurrentDesktop: GNOME-Flashback:GNOME Date: Fri May 22 06:49:34 2020 InstallationDate: Installed on 2020-04-27 (24 days ago) InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423) MachineType: Dell Inc. G5 5590 ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=de_DE.UTF-8 SHELL=/bin/bash ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-29-generic root=UUID=7c9113b7-ca65-4c46-9435-f5d2b73bab72 ro quiet RelatedPackageVersions: linux-restricted-modules-5.4.0-29-generic N/A linux-backports-modules-5.4.0-29-generic N/A linux-firmware 1.187 SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 02/07/2020 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.12.0 dmi.board.name: 0KW84T dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.12.0:bd02/07/2020:svnDellInc.:pnG55590:pvr:rvnDellInc.:rn0KW84T:rvrA00:cvnDellInc.:ct10:cvr: dmi.product.family: GSeries dmi.product.name: G5 5590 dmi.product.sku: 08EA dmi.sys.vendor: Dell Inc. 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