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Gmane
From: Frank Mehnert <frank-2taLTamkYL2ELgA04lAiVw <at> public.gmane.org>
Subject: Re: Performance issues
Newsgroups: gmane.comp.emulators.virtualbox.general
Date: Tuesday 13th November 2007 07:53:33 UTC (over 9 years ago)
On Tuesday 13 November 2007, Mike Jeays wrote:
> On November 12, 2007 04:04:59 pm Frank Mehnert wrote:
> > Don't mix guest and host here. tickless is only an issue for host
> > kernels. HZ=100 is recommended for guest kernels.
>
> Thanks for the hints.  I tried setting nohz=off in /boot/grub/menu.lst on
> the host, and also tried it at boot time. I booted the Mandriva guest
with
> hz=100.  It didn't seem to make much difference.  Typical start times for
> Mozilla on the host are 9 seconds, on the guest 65 seconds.  I got
similar
> results for GIMP and OpenOffice - about 7 times slower.
>
> Did I get them the right way around?  Any other suggestions, plase?

Booting the Mandria kernel with hz=100 will not help, you have to recompile
your guest kernel. Recompiling your host kernel with CONFIG_HZ=1000 might
help a bit as well. All in all this is a known issue and we are trying to
improve things here.

Kind regards,

Frank
-- 
Dr.-Ing. Frank Mehnert    innotek GmbH, http://www.innotek.de
 
CD: 3ms