https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238733
Bug ID: 238733
Summary: kvm disk i/o extremely slow
Product: Base System
Version: 12.0-RELEASE
Hardware: Any
OS: Any
Status: New
Severity: Affects Only Me
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Hi,
I've posted this on the forum:
https://forums.freebsd.org/threads/is-kvm-virtio-really-that-slow-on-freebsd.71186/#post-430366
But I'll reiterate here.
Basically, I'm running a FreeBSD 12 image created alongside this document:
https://docs.openstack.org/image-guide/freebsd-image.html
(plus swap)
On a KVM host that is, TTBOMK, Ubuntu 18. Storage is Ceph Blockstorage, using
pure NVMe SSDs - but I/O is capped at 2000 IOP/s.
Using CentOS as a KVM guest, I basically get this:
[root@centos ~]# dc3dd wipe=/dev/sdb
dc3dd 7.1.614 started at 2019-06-20 07:54:22 +0000
compiled options:
command line: dc3dd wipe=/dev/sdb
device size: 83886080 sectors (probed)
sector size: 512 bytes (probed)
42949672960 bytes (40 G) copied (100%), 342.37 s, 120 M/s
input results for pattern `00':
83886080 sectors in
output results for device `/dev/sdb':
83886080 sectors out
dc3dd completed at 2019-06-20 08:00:05 +0000
Using FreeBSD, I get this:
root@freebsd:~ # dc3dd wipe=/dev/vtbd2
dc3dd 7.2.646 started at 2019-06-20 09:37:10 +0200
compiled options:
command line: dc3dd wipe=/dev/vtbd2
device size: 83886080 sectors (probed), 42,949,672,960 bytes
sector size: 512 bytes (probed)
42949672960 bytes ( 40 G ) copied ( 100% ), 4585 s, 8.9 M/s
input results for pattern `00':
83886080 sectors in
output results for device `/dev/vtbd2':
83886080 sectors out
dc3dd completed at 2019-06-20 10:53:35 +0200
The forum posting has fio-runs with the actual I/O numbers.
Are the drivers really that bad?
If this is the situation, FreeBSD is completely useless in the cloud. At least
for us.
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