[Bug 212858] FreeBSD 11-stable regression in storage IOPS

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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: freebsd-bugs at FreeBSD.org
          Reporter: patrick_dkt at yahoo.com.hk
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

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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