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-   -   do mtrrs matter anymore? (http://www.nvnews.net/vbulletin/showthread.php?t=80688)

crz 11-18-06 01:05 PM

do mtrrs matter anymore?
 
Can anyone tell me how much MTRRs matter these days?

I remember back in the PCI and AGP days, it was important to enable write-combining on the framebuffer region using MTRRs to get the best performance. Then, when the X server figured out how to set MTRRs itself, everyone was happy.

Now I've progressed to Linux on x86-64 with a PCI-E GeForce 6500, and it's just swell. But the X server doesn't set any MTRRs automatically (yes, they're enabled in the kernel and I can configure them manually). It's Ubuntu X.org 7.1.1 (edgy) on a 2.6.18 kernel, if that matters.

Is this expected? Or rather, would it help performance if I configured MTRRs myself?

Thx for any advice. I'm not suffering from performance problems or anything, but I'm just curious.

PrakashP 11-18-06 04:46 PM

Re: do mtrrs matter anymore?
 
Nvidia uses PAT to get the benfits one would get by setting up the mtrr, so you don't have to bother.


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