https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=212858
Bug ID: 212858
Summary: FreeBSD 11-stable regression in storage IOPS
Product: Base System
Version: 11.0-STABLE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
CC: [email protected]
CC: [email protected]
I have this VM (FreeBSD 10.3) in this setting:
KVM (Fedora 24)
VM (FreeBSD 10.3) and there are virtio-scsi disks connected to the VM:
1) OS disk
2) ZFS data disks
3) ZFS ZIL
All three files in host file system is file based. The files are stored in the
SSD.
I have done fio IO test in the FreeBSD VM:
The bandwidth and IO is :
READ bw=14709KB/s, iops=3677
WRITE bw=4898.8KB/s, iops=1224
After changing the VM to FreeBSD 11.0-stable, other settings remain the same.
I do fio IO test again.
The new statistics is:
READ bw=5651.3KB/s, iops=1412
WRITE bw=1889.1KB/s, iops=472
For reference, the command for fio:
fio --filename=./testfile --direct=1 --rw=randrw --refill_buffers --norandommap
--randrepeat=0 --ioengine=sync --bs=4k --rwmixread=75 --iodepth=16 --numjobs=8
--runtime=60 --group_reporting --fsync=1 --name=4ktest -size=4G
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