apport information ** Tags added: apport-collected focal uec-images
** Description changed: I am seeing an issue with NFSv4 performance on Ubuntu 20.04.3 LTS on both clients and server (tested kernels 5.4 to 5.16), where the server is connected by 10Gbit Ethernet and with multiple clients connected by 1Gbit. I am reading a large file from an NFS mount via "dd" sending output to /dev/null with bs=4096. Using default sysctl and mount options I am seeing speeds maxing out below 1Gbit/sec. If I force NFSv3 I see speeds close to 10Gbit/sec with sufficient clients connected. I also see no issue with Ubuntu 16.04 (when used for both server and clients) in conjunction with NFSv4. I have attached the output from two iftop's which shows the status when using NFSv4 and when using NFSv3, in the NFSv4 you can clearly see one client reading at max speed and all the others apparently throttling back to practically nothing. I have additionally tested a range of mount options, which made no difference, BBR congestion control which made no difference and the following kernel settings which also made no difference: net.core.netdev_max_backlog=250000 net.core.rmem_max=4194304 net.core.wmem_max=4194304 net.core.rmem_default=4194304 net.core.wmem_default=4194304 net.core.optmem_max=4194304 net.ipv4.tcp_rmem=4096 87380 4194304 net.ipv4.tcp_wmem=4096 65536 4194304 net.ipv4.tcp_mem=786432 1048576 26777216 net.ipv4.udp_mem=1529892 2039859 3059784 net.ipv4.udp_rmem_min=16384 net.ipv4.udp_wmem_min=16384 - The problem is seen on dissimilar hardware, ie this problem exists when - testing with an HP DL380 G10 with Mellanox 10Gbit Ethernet connected to - Cisco switch, and also on a Dell R430 with Broadcom 10Gbit Ethernet - connected to a Netgear switch (just to name two of several - configurations that have been tested). The clients vary in each test - case also, but are desktop PCs and laptops. + The problem is seen on dissimilar hardware, ie this problem exists when testing with an HP DL380 G10 with Mellanox 10Gbit Ethernet connected to Cisco switch, and also on a Dell R430 with Broadcom 10Gbit Ethernet connected to a Netgear switch (just to name two of several configurations that have been tested). The clients vary in each test case also, but are desktop PCs and laptops. + --- + ProblemType: Bug + AlsaDevices: + total 0 + crw-rw----+ 1 root audio 116, 1 Feb 15 10:23 seq + crw-rw----+ 1 root audio 116, 33 Feb 15 10:23 timer + AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' + ApportVersion: 2.20.11-0ubuntu27.21 + Architecture: amd64 + ArecordDevices: Error: [Errno 2] No such file or directory: 'arecord' + AudioDevicesInUse: Error: command ['fuser', '-v', '/dev/snd/seq', '/dev/snd/timer'] failed with exit code 1: + CasperMD5CheckResult: pass + DistroRelease: Ubuntu 20.04 + InstallationDate: Installed on 2022-02-14 (0 days ago) + InstallationMedia: Ubuntu-Server 20.04.2 LTS "Focal Fossa" - Release amd64 (20210201.2) + IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' + MachineType: Dell Inc. PowerEdge R430 + Package: linux (not installed) + PciMultimedia: + + ProcEnviron: + TERM=xterm + PATH=(custom, no user) + LANG=en_US.UTF-8 + SHELL=/bin/bash + ProcFB: 0 mgag200drmfb + ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.13.0-28-generic root=UUID=d227a745-134e-4633-9c26-bcc062655f95 ro + ProcVersionSignature: Ubuntu 5.13.0-28.31~20.04.1-generic 5.13.19 + RelatedPackageVersions: + linux-restricted-modules-5.13.0-28-generic N/A + linux-backports-modules-5.13.0-28-generic N/A + linux-firmware 1.187.26 + RfKill: Error: [Errno 2] No such file or directory: 'rfkill' + Tags: focal uec-images + Uname: Linux 5.13.0-28-generic x86_64 + UpgradeStatus: No upgrade log present (probably fresh install) + UserGroups: N/A + _MarkForUpload: True + dmi.bios.date: 06/07/2021 + dmi.bios.release: 2.13 + dmi.bios.vendor: Dell Inc. + dmi.bios.version: 2.13.0 + dmi.board.name: 0CN7X8 + dmi.board.vendor: Dell Inc. + dmi.board.version: A04 + dmi.chassis.type: 23 + dmi.chassis.vendor: Dell Inc. + dmi.modalias: dmi:bvnDellInc.:bvr2.13.0:bd06/07/2021:br2.13:svnDellInc.:pnPowerEdgeR430:pvr:rvnDellInc.:rn0CN7X8:rvrA04:cvnDellInc.:ct23:cvr:skuSKU=NotProvided;ModelName=PowerEdgeR430: + dmi.product.name: PowerEdge R430 + dmi.product.sku: SKU=NotProvided;ModelName=PowerEdge R430 + dmi.sys.vendor: Dell Inc. ** Attachment added: "CRDA.txt" https://bugs.launchpad.net/bugs/1960826/+attachment/5561012/+files/CRDA.txt -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1960826 Title: NFSv4 performance problem with newer kernels To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1960826/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
