Hi Matthew, yes we do have NFSv3 in our environment and mostly all PHP requests pull files sitting in network storage. However "waiting access" (wa) indicator is close to zero while inspecting "top".
In the past when we had had issues with NFS3 most processes slow down while waiting for I/O thus causing a significant spike in the indicator. Doesn't happen this time. Regards, Al -- 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
