Dear Dan, I am not sure you are mailing the right person. Anyway, the issue still arises when copying large files from a FAT drive to an EXT one. kswapd uses all available CPU power (but leaves much of the RAM unused) and copy throughput declines.
Anyway, I solved the problem by transferring my external drive to an EXT4 filesystem, at the expense of interoperability. Best Le jeu. 26 oct. 2017 à 13:26, Dan Streetman <dan.street...@canonical.com> a écrit : > this bug is fix released. please open a new bug. > > note that you may just have been out of memory. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1518457 > > Title: > kswapd0 100% CPU usage > > Status in Linux: > Unknown > Status in linux package in Ubuntu: > Fix Released > Status in linux source package in Xenial: > Fix Released > Status in linux source package in Yakkety: > Fix Released > > Bug description: > As per bug 721896 and various others: > > I'm on an AWS t2.micro instance (Xeon E5-2670, 991MiB of memory). > Occasionally (about once a day), kswapd0 falls into a busy loop and > spins on 100% CPU usage indefinitely. This can be provoked by > copying/writing large files (e.g. dding a 256MB file), but it happens > occasionally otherwise. System memory usage (not including > buffers/caches) currently sits at 36%, which is typical[1]. Initially > I had no swap space configured; I've since tried enabling a 256MB swap > file, but the problem continues to occur and no swap space is used. > The system can be recovered with `echo 1 > /proc/sys/vm/drop_caches`. > > Happy to provide further information/take further debugging actions. > > > [1] Full output from `free`: > total used free shared buffers cached > Mem: 1014936 483448 531488 28556 9756 112700 > -/+ buffers/cache: 360992 653944 > Swap: 262140 0 262140 > > ProblemType: Bug > DistroRelease: Ubuntu 15.10 > Package: linux-image-4.2.0-18-generic 4.2.0-18.22 > ProcVersionSignature: Ubuntu 4.2.0-18.22-generic 4.2.3 > Uname: Linux 4.2.0-18-generic x86_64 > AlsaDevices: > total 0 > crw-rw---- 1 root audio 116, 1 Nov 19 19:40 seq > crw-rw---- 1 root audio 116, 33 Nov 19 19:40 timer > AplayDevices: Error: [Errno 2] No such file or directory: 'aplay' > ApportVersion: 2.19.1-0ubuntu5 > 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: > CRDA: N/A > Date: Fri Nov 20 20:44:30 2015 > Ec2AMI: ami-1c552a76 > Ec2AMIManifest: (unknown) > Ec2AvailabilityZone: us-east-1d > Ec2InstanceType: t2.micro > Ec2Kernel: unavailable > Ec2Ramdisk: unavailable > IwConfig: Error: [Errno 2] No such file or directory: 'iwconfig' > Lsusb: Error: command ['lsusb'] failed with exit code 1: unable to > initialize libusb: -99 > MachineType: Xen HVM domU > PciMultimedia: > > ProcEnviron: > TERM=screen > PATH=(custom, no user) > LANG=en_US.UTF-8 > SHELL=/bin/bash > ProcFB: 0 xen > ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-18-generic > root=UUID=35bc01f4-4602-4823-976e-508edef899df ro console=tty1 > console=ttyS0 net.ifnames=0 > RelatedPackageVersions: > linux-restricted-modules-4.2.0-18-generic N/A > linux-backports-modules-4.2.0-18-generic N/A > linux-firmware N/A > RfKill: Error: [Errno 2] No such file or directory: 'rfkill' > SourcePackage: linux > UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' > UpgradeStatus: No upgrade log present (probably fresh install) > dmi.bios.date: 05/06/2015 > dmi.bios.vendor: Xen > dmi.bios.version: 4.2.amazon > dmi.chassis.type: 1 > dmi.chassis.vendor: Xen > dmi.modalias: > dmi:bvnXen:bvr4.2.amazon:bd05/06/2015:svnXen:pnHVMdomU:pvr4.2.amazon:cvnXen:ct1:cvr: > dmi.product.name: HVM domU > dmi.product.version: 4.2.amazon > dmi.sys.vendor: Xen > > To manage notifications about this bug go to: > https://bugs.launchpad.net/linux/+bug/1518457/+subscriptions > -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1518457 Title: kswapd0 100% CPU usage To manage notifications about this bug go to: https://bugs.launchpad.net/linux/+bug/1518457/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
