FreeBSD 13.0 terrible performance in KVM

[Jeff Love]

I'm running 12.2 and 13.0 on KVM using virtio and zfs. I am not having 
disk I/O issues.

Jeff Love

On 4/24/21 5:25 AM, dashdruid via freebsd-stable wrote:
> Hello List,
>
> I hope some other folks out there running FreeBSD on KVM as well. I set up a base VM while doing so I noticed that the disk operations are very slow. Many times I edit a file in vim or try to run a command there is a huge lag.
>
> I use UFS as the root filesystem. To have something to compare it with I have tested it against an OpenBSD 6.6 VM on the same host, same hardware. both have 1 vCPU and 1GB of ram, 20GB virtual disk (they are exactly on the same physical disk no raid or anything to have a fair comparison).
>
> Here is an example simple file search time for a non-existent file:
>
> FreeBSD 13
>
> time find / -name cacert.pem
>
> real 0m30.656s
> user 0m0.516s
> sys 0m3.938s
>
> Second run even worse
>
> real 2m38.618s
> user 0m0.711s
> sys 0m6.882s
>
> While on the OpenBSD VM I get
>
> time find / -name cacert.pem
>
> real 0m2.258s
> user 0m0.290s
> sys 0m1.970s
>
> The amount of data is about the same on both systems but I would not consider this a "slight" performance degradation. If the base system is so slow then imagine putting Apache and other servers on top of it. Did anyone run into this?
>
> Unless there is a definitive solution I will opt out to using other BSD variants.
> _______________________________________________
> freebsd-stable at freebsd.org mailing list
> https://lists.freebsd.org/mailman/listinfo/freebsd-stable
> To unsubscribe, send any mail to "freebsd-stable-unsubscribe at freebsd.org"
>

-- 
This message has been scanned for viruses and
dangerous content by MailScanner, and is
believed to be clean.