* mtrr registers with >= 4GB ram @ 2008-07-02 14:55 Rann Bar-On 2008-07-02 16:49 ` Yinghai Lu 0 siblings, 1 reply; 2+ messages in thread From: Rann Bar-On @ 2008-07-02 14:55 UTC (permalink / raw) To: linux-kernel As documented at https://bugs.launchpad.net/linux/+bug/210780 and http://www.rage3d.com/board/showthread.php?t=33821469 (as well as other places - google 4gb mtrr bug), the kernel appears to misdetect the mtrr registers on many machines with 4gb ram, causing all sorts of issues - especially with video drivers in X. It is possible to rewrite the correct registers using a pretty hackish script, but the bug should probably be fixed at the kernel level. Please CC me personally when replying, as I'm not on LKML. I'd be happy to try out patches if such come along :) Thanks, Rann ^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: mtrr registers with >= 4GB ram 2008-07-02 14:55 mtrr registers with >= 4GB ram Rann Bar-On @ 2008-07-02 16:49 ` Yinghai Lu 0 siblings, 0 replies; 2+ messages in thread From: Yinghai Lu @ 2008-07-02 16:49 UTC (permalink / raw) To: rb6; +Cc: linux-kernel On Wed, Jul 2, 2008 at 7:55 AM, Rann Bar-On <rb6@duke.edu> wrote: > As documented at https://bugs.launchpad.net/linux/+bug/210780 and > http://www.rage3d.com/board/showthread.php?t=33821469 (as well as other > places - google 4gb mtrr bug), the kernel appears to misdetect the mtrr > registers on many machines with 4gb ram, causing all sorts of issues - > especially with video drivers in X. It is possible to rewrite the correct > registers using a pretty hackish script, but the bug should probably be > fixed at the kernel level. > > Please CC me personally when replying, as I'm not on LKML. I'd be happy to > try out patches if such come along :) please try tip/master http://people.redhat.com/mingo/tip.git/readme.txt we have some patches there ... x86: mtrr cleanup for converting continuous to discrete layout, v8 x86: mtrr cleanup for converting continuous to discrete layout v8 - fix x86: mtrr cleanup for converting continuous to discrete - auto detect v4 x86: mtrr cleanup for converting continuous to discrete layout - fix #2 YH ^ permalink raw reply [flat|nested] 2+ messages in thread
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