Re: X hangs console since upgrade
On Tue, Nov 14, 2000 at 10:57:10PM -0800, Seth Arnold wrote:
> * Robert Braddock <stormwarden@bigfoot.com> [001114 22:17]:
> > > Tenth idea -- the log file mentions the machine hasn't mtrr support.
> > > Perhaps this needs to be enabled in your kernel?
> >
> > What's MTRR anyway? I haven't changed the kernel in a while, but I'll look
> > for that when I recompile it out of desperation :)
>
> Good god, we just went through ten ideas, and not a one helped. I knew
> each was lousy individually, but .. I hoped one in the middle would do
> the trick.
>
> MTRRs are, I think, memory type range registers. Maybe they are used to
> implement finer-grained memory protection than segments, which is what I
> think Linux uses. The option for this is somewhere near the top of the
> kernel config script.
I believe they are caching hints; they tell the onboard cache about
blocks of memory to cache, or not to cache. CPUs from the P-II and K6
up have them. I'd be surprised if they caused a crash; certainly
enabling them often makes graphics faster.
Jules
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