OpenBSD 4.8 very slow

[asterix]

Hello,

I successfully installed OpenBSD 4.8 guest on my PVE 1.8 but it runs abnormally SLOW... The VM CPU is always >100%.
Does anyone know why?

I've googled and I was able to find someone with the same experience KVM+OpenBSD 4.8, but there's no solution for the problem.


Thanks.

 

[claytonjr]

http://www.enjoybsd.com/blog/2011/02/15/virtualization-running-openbsd-on-kvm/

I've managed to get obsd 4.8 running on kvm, by using these instructions.

 

[asterix]

Thank you so much, my OpenBSD is now super fast!!

Steps:
1. Test if disabling mpbios works, during boot enter:

boot> bsd -c
...
UKC> disable mpbios
 54 mpbios0 disabled
UKC> quit
...

2. If this solves the speed problem disable mpbios permanently. Log as root and enter:

# config -ef /bsd
OpenBSD 4.8 (GENERIC) #136: Mon Aug 16 09:06:23 MDT 2010
    [email]deraadt@i386.openbsd.org[/email]:/usr/src/sys/arch/i386/compile/GENERIC
Enter 'help' for information
ukc> disable mpbios
352 mpbios0 disabled
ukc> quit
Saving modified kernel.
#

Thanks!

 

[iron123]

Hi,

are there any other tricks to speed up OpenBSD Guests?
I have two identical servers as KVM-Hosts, one is running proxmox 1.8 the other is running ConVirt.

On the ConVirt-Server OpenBSD runs out of the box without any speed problems, but on the proxmox-Server the OpenBSD guests are really slow.
Unless I use the kernel parameter provided in the link above. But setting this parameter on every boot for each Guest manually is no real option.

So I'm a little confused if ConVirt provides KVM with different options to speed up OpenBSD Guests.

 

[asterix]

Hello,

setting this parameter on every boot for each Guest manually is no real option.

After doing the step 2 the change is permanent (at least for my setup), so you only do this once per each OpenBSD guest.

 

[iron123]

Yeah, but thats stil not an option. But I found out that kvm 0.12 works fine, so I just downgraded with the kvm modules in the proxmox repo and openbsd-guests are running again.

 

[tom]

did you test KVM 0.15 (see our pvetest repo)?

 

[iron123]

No, not yet. But I have a testing machine on which I can install and test kvm 0.15, will do that in the next days.

 

[iron123]

I just did a quick test comparing kvm 0.12 and 0.15. kvm 0.15 runs better than 0.14... but compared to 0.12 the performace of openbsd-guests is still noticable slower.
So I will go with kvm 0.12 for now.

 

[SamTzu]

Thank you asterix. Your suggestion to disable mpbios worked.
It took me almost 3h to boot the BSD and log in to make the necessary changes.