Hi,
At 01:04 -0700 9/10/00, Peter Wemm wrote:
>Mike Smith wrote:
>> > > That was it. Is the 4MB kernel size limit documented anywhere?
>> >
>> > I don't know :-) I luckily noticed this by a lot of trials.
>>
>> I'm not aware of any 4MB limit on kernel size (and I ought to be if there
>> is one 8). Can you run the details past me? (I've regularly booted much
>> larger kernels in the past...)
>
>Uhh, are you sure? Ignore the size of the file, what does 'size(1)' say
>about these large kernels? Does text+data+bss excede 4MB? I have a
>nagging suspicion that we only set up 4MB of page tables during the early
>part of the bootstrap process in locore.s. (forgive me for not looking,
>I have a most evil headache and locore.s is no way to improve it :-).
>Thinking about it some more, there may be a 3MB limit as we load above
>1MB. I recall some heavy magic with the SMP bootstrap where we only use one
>PTD slot for 0-4MB in early boot....
Example:
% size kernel*/kernel
text data bss dec hex filename
3302182 206816 2265368 5774366 581c1e kernel.old/kernel
2947194 207168 168152 3322514 32b292 kernel/kernel
Same kernel config except that top one includes KTR options and won't boot,
bottom one has no KTR and boots OK. I've been running with SMP_DEBUG, KTR
and the rest for a while, this trouble started a few days ago.
--
Bob Bishop (0118) 977 4017 international code +44 118
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