[patch] Auto-setting hz to 100 inside QEMU/VMWare

G. Stanley gary at vsnx.net
Fri Dec 28 00:39:19 PST 2007


At 03:03 AM 12/28/2007, Mike Silbersack wrote:

>When running FreeBSD inside QEMU / VMWare, one of my pet peeves is 
>that time is completely inaccurate.  This seems to be cured by 
>setting kern.hz=100 (down from the default of 1000) in 
>/boot/loader.conf, but I'm getting sick of doing that every time I 
>set up a virtual box.
>
>So, here's a patch to have the kernel auto-detect that it's running 
>inside one of those two environments and automatically make that adjustment.
>
>If you're running FreeBSD inside any other virtual environments 
>(Parallels?  Microsoft Virtual PC?) and can detect them via data in 
>kenv, I'll be happy to add them to the patch as well.
>
>I have only tested this patch in QEMU so far, I will test inside 
>VMWare tomorrow.
>
>If anyone could review and/or test this, it would be appreciated.

I had a diff, but I lost it due to hardware crash... Anyways, I've 
tested your patch with VMWare and it works perfectly.



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