Hi Alfredo, Do you happen to use NFSv3 in your environment? There was a regression in 5.4.0-144-generic that cased a massive spike in ACCESS requests being made, which could explain low performance.
bug 2009325 Thanks, Matthew -- 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/2009882 Title: Linux 5.4.0-144-generic x86_64 multithread / fork issues Status in linux package in Ubuntu: Confirmed Bug description: We have same servers already running in 5.4.0-122 , 126, 128 and 131 releases with no issues whatsoever and exceptional good performance. They basically have either Apache/2.4.41/mod_php7.4 or Apache/2.4.41/mpm_event with phm7.4-fpm setups, all working perfect. When we load kernel 5.4.0-144 CPU processing go thru the roof, and process kworker/u17:0-xprtiod show at the top. Both setups perform badly with Apache performance going avg 200ms/req in older kernels to over 4,500ms/req in this 144 release. CPU usage from avg 0.4% to over 50% under same traffic and requests rate. We just reloaded old kernels back, via /etc/default/grub, and performance is right back. Same packages, same services, everything the same but the Linux kernel. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: linux-image-5.4.0-144-generic 5.4.0-144.161 ProcVersionSignature: Ubuntu 5.4.0-144.161-generic 5.4.229 Uname: Linux 5.4.0-144-generic x86_64 AlsaDevices: total 0 crw-rw---- 1 root audio 116, 1 Mar 9 13:21 seq crw-rw---- 1 root audio 116, 33 Mar 9 13:21 timer AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' ApportVersion: 2.20.11-0ubuntu27.25 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 Date: Thu Mar 9 13:22:31 2023 InstallationDate: Installed on 2021-11-17 (477 days ago) InstallationMedia: Ubuntu-Server 20.04.3 LTS "Focal Fossa" - Release amd64 (20210824) IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 002 Device 003: ID 0e0f:0002 VMware, Inc. Virtual USB Hub Bus 002 Device 002: ID 0e0f:0003 VMware, Inc. Virtual Mouse Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Lsusb-t: /: Bus 02.Port 1: Dev 1, Class=root_hub, Driver=uhci_hcd/2p, 12M |__ Port 1: Dev 2, If 0, Class=Human Interface Device, Driver=usbhid, 12M |__ Port 2: Dev 3, If 0, Class=Hub, Driver=hub/7p, 12M /: Bus 01.Port 1: Dev 1, Class=root_hub, Driver=ehci-pci/6p, 480M MachineType: VMware, Inc. VMware Virtual Platform PciMultimedia: ProcEnviron: TERM=xterm-256color PATH=(custom, no user) XDG_RUNTIME_DIR=<set> LANG=en_US.UTF-8 SHELL=/bin/bash ProcFB: 0 svgadrmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-5.4.0-144-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro maybe-ubiquity RelatedPackageVersions: linux-restricted-modules-5.4.0-144-generic N/A linux-backports-modules-5.4.0-144-generic N/A linux-firmware 1.187.36 RfKill: Error: [Errno 2] No such file or directory: 'rfkill' SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/12/2018 dmi.bios.vendor: Phoenix Technologies LTD dmi.bios.version: 6.00 dmi.board.name: 440BX Desktop Reference Platform dmi.board.vendor: Intel Corporation dmi.board.version: None dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 1 dmi.chassis.vendor: No Enclosure dmi.chassis.version: N/A dmi.modalias: dmi:bvnPhoenixTechnologiesLTD:bvr6.00:bd12/12/2018:svnVMware,Inc.:pnVMwareVirtualPlatform:pvrNone:rvnIntelCorporation:rn440BXDesktopReferencePlatform:rvrNone:cvnNoEnclosure:ct1:cvrN/A: dmi.product.name: VMware Virtual Platform dmi.product.version: None dmi.sys.vendor: VMware, Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2009882/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
