VIMAGE status

Julian Elischer julian at
Mon May 4 17:32:47 UTC 2009

Paul B. Mahol wrote:
> 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)


if you do not have VIMAGE enabled then there should be no effect for you.

I suggest you make sure that your userland and kernel are completely 
in sync.


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