[SOLVED] RE: [Backtrace] 4.9 and 5.1-RELEASE occasionly panic on RAM > 4GB without PAE (long)

Sten sten at blinkenlights.nl
Thu Dec 25 10:24:21 PST 2003

On Thu, 25 Dec 2003, [gb2312] Xin LI/ÀîöÎ wrote:

> First I would say "thank you" to those who helped me to find the cause of
> the problem. Now I have confirmed that the problem goes away after a kernel
> configuration tuning.
> To trigger the problem, the box must have more than 2GB RAM and the
> following configuration:
> options         MAXDSIZ=(1024UL*1024*1024)
> options         MAXSSIZ=(128UL*1024*1024)
> options         DFLDSIZ=(1024UL*1024*1024)
> A default, say, GENERIC kernel would not trigger panic's during my test.
> The problem exists on 4-STABLE and 5-CURRENT, however, by increasing kernel
> virtual address space by adding a line like the following:
> options         KVA_PAGES=512
> The panics goes away.

I'd really love getting rid of most hardcoded memory allocations
in the fbsd kernel, with the main bugger being NMBCLUSTERS,
which one always forgets about untill it's too late :(.
In solaris auto-tuning has been a top priority for a long while,
and propper dynamic tuning should get it right ( or even better )
in 99% of the cases. People with other needs should be able
to build a custom kernel.

Maybe a nice goal for 6.0 :)

I do have to note that fbsd5 has been getting better and better,
on sparc64 it beats out linux and netbsd for my purposes.
Good work.

Sten Spans

There is a crack in everything that's how the light gets in.

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