Can you inform me the exact test configuration you were using?
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https://bugs.launchpad.net/bugs/1883676
Title:
ZFS performance drops suddenly
Status in zfs-linux package in Ubuntu:
Confirmed
Bug description:
Run Phoronix Flexible IO / Random write benchmark.
After running the benchmark repeatedly multiple times (occasionally it can be
30 minutes or 8 hours), the performance drops suddenly. The only way (I know
of) to get back to high performance is reboot.
---
$ for i in $(seq 1 1000); do printf "2\n4\n2\n1\n1\n1\nn\n" |
phoronix-test-suite run fio | awk '/Average.*IOPS/ {print $2}' >> /tmp/iops;
done
$ less /tmp/iops
...
2095
2095
2093
783
388
389
...
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: zfsutils-linux 0.7.5-1ubuntu16.9
ProcVersionSignature: User Name 5.3.0-1023.25~18.04.1-aws 5.3.18
Uname: Linux 5.3.0-1023-aws x86_64
NonfreeKernelModules: zfs zunicode zavl icp zcommon znvpair
ApportVersion: 2.20.9-0ubuntu7.15
Architecture: amd64
Date: Tue Jun 16 08:55:01 2020
Ec2AMI: ami-06fd83ae47b05282f
Ec2AMIManifest: (unknown)
Ec2AvailabilityZone: us-east-1f
Ec2InstanceType: c4.xlarge
Ec2Kernel: unavailable
Ec2Ramdisk: unavailable
SourcePackage: zfs-linux
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.sudoers.d.zfs: [deleted]
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