[26-devel] v2.6 performance slowdown on MPC8xx: Measuring TLB cache misses

Joakim Tjernlund Joakim.Tjernlund at lumentis.se
Sun Apr 24 09:51:34 EST 2005

> On Apr 23, 2005, at 1:23 PM, Joakim Tjernlund wrote:
> > Does CONFIG_PIN_TLB make a difference?
> While looking at the code, I noticed this will only work
> if you can map all of the memory with wired TLB entries.
> If you have more than 24M of memory, make sure you
> enable CONFIG_MODULES to eliminate the TLB miss
> optimization that will certainly crash a system by failing
> to look up kernel PTEs correctly.

hmm, I have more than 24MB of memory and I can run CONFIG_PIN_TLB just
fine with modules off in kernel 2.4. Havn't tried 2.6 yet.


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