it is the kernel.. it's the method of PAT forcing back to MTRRs, so this
may be per CPU basis and not related to GPU's.
There has been a work around for those who have installed using the binary
(this work around is NOT for third party inclusion)
diff -ru usr/src/nv/nv.c usr/src/nv.572433/nv.c
--- usr/src/nv/nv.c 2009-05-27 03:20:53.000000000 -0700
+++ usr/src/nv.572433/nv.c 2009-07-05 11:31:27.635210006 -0700
@@ -888,6 +888,7 @@
unsigned int pat1, pat2, i;
U008 PAT_WC_index;
+#if 0 /* disabled */
if (!test_bit(X86_FEATURE_PAT,
(volatile unsigned long *)&boot_cpu_data.x86_capability))
{
@@ -895,6 +896,7 @@
"NVRM: CPU does not support the PAT, falling back to MTRRs.\n");
return NV_PAT_MODE_DISABLED;
}
+#endif
NV_READ_PAT_ENTRIES(pat1, pat2);
PAT_WC_index = 0xf;
You can get all the info from nvidia's site:
http://www.nvnews.net/vbulletin/showthread.php?t=133112&page=1
or more directly this post:
http://www.nvnews.net/vbulletin/showpost.php?p=2041755&postcount=29
--
Compiz Slow on Karmic w/ NVIDIA and 2.6.30 Kernel
https://bugs.launchpad.net/bugs/391461
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