VIMAGE status

Paul B. Mahol onemda at
Mon May 4 12:53:50 UTC 2009

On 5/2/09, Julian Elischer <julian at> wrote:
> The VIMAGE code is nearly all in the the kernel.
> One is now able to make VIMAGE kernels (add options VIMAGE)
> though they don't actually allow you to make multiple
> vimages instances yet..
> The VIMAGE option enables all the low level changes needed
> throughout the kernel.
> The VIMAGE_GLOBALS option basically sets thing sback to how they were
> before.
> Having neither (the default) gives a kernel that is a kind of hybrid.
> The Hybrid state is what will go forward as 'NON-VIMAGE' mode
> and the VIMAGE_GLOBALS mode will probably go away in time as
> it complicates the code.
> The aim of this mail is to ask people to try add the VIMAGE option
> to their regular kernels and try use them as you woudl normally.
> You will not yet be able to use any new VIMAGE features but we
> should be fully compatible with previous kernels.
> Please report any concerns to the freebsd-virtualization@ mailing list.
> THEORETICALLY you should not see any changes in behaviour, however we
> have the following issues:
> * SCTP is not fully converted yet. add 'nooptions SCTP' for now if you
>    are not using it yet.
> * An NFS (crash) issue was reported. This MAY have been fixed...
> Theory tells us that all three kernel options should behave about the
> same but if you do try this, and have any benchmarking facilities,
> it would be incredibly useful if you could let us know if you see any
> performance changes between the three.

I'm experiencing strange 'netstat -r' output, perhaps I need to clean
/usr/obj/? (I dont have VIMAGE enabled)


More information about the freebsd-current mailing list