[CFT] SIFTR - Statistical Information For TCP Research: Uncle Lawrence needs YOU!

Lawrence Stewart lstewart at freebsd.org
Mon Jun 21 04:10:47 UTC 2010

On 06/21/10 05:44, Rui Paulo wrote:
> On 20 Jun 2010, at 20:36, Fabian Keil wrote:
>> Fabian Keil<freebsd-listen at fabiankeil.de>  wrote:
>>> Fabian Keil<freebsd-listen at fabiankeil.de>  wrote:
>>>> My custom kernel normally doesn't have INVARIANTS and WITNESS
>>>> enabled, so I'll try to enable them next.
>>> The culprit seem to be non-default KTR settings in the kernel
>>> while loading alq as a module.
>> Actually whether or not alq is loaded as a module doesn't
>> seem to matter, with:
>> options		KTR
>> options		KTR_ENTRIES=262144
>> options		KTR_MASK=(KTR_SCHED)
>> options		KTR_CPUMASK=0x3
>> options		ALQ
>> options		KTR_ALQ
>> enabling siftr panics the system, too.
> That's probably because your module was built with different compile time options than the ones used in the kernel. These options may change structure sizes, function parameters, etc. and that easily causes panics.

hmm I wonder if my instructions to build SIFTR manually are causing your 
problems. Fabian, is the siftr.ko module you're loading built as part of 
a "make buildkernel", or did you follow my instructions and "cd 
</path/to/src>/sys/modules/siftr ; make ; kldload ./siftr.ko"?

If the latter is true, perhaps try and explicitly build SIFTR as part of 
"make buildkernel" and see if loading the module built that way still 
triggers the panic when enabled (the module will be in 
or if you "make installkernel" it'll be in /boot/kernel/kernel/siftr.ko).


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