Messages in this thread | | | From | Jesse Barnes <> | Subject | Re: [PATCH] x86_32: trim memory by updating e820 v3 | Date | Mon, 28 Apr 2008 09:55:53 -0700 |
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On Monday, April 28, 2008 9:31 am Mika Fischer wrote: > Jesse Barnes schrieb: > > On Monday, April 28, 2008 6:53 am Ingo Molnar wrote: > >> i think we should still try to make this a non-default option because > >> modern Xorg should not have any need to touch MTRRs. Perhaps a .config > >> dependent on CONFIG_DANGEROUS ;-) > > > > Well, not quite... we're still waiting on some way of getting WC > > semantics for sysfs PCI files. Suresh tells me something like that is > > queued up, but until that hits the mainline X will still need to bang the > > MTRRs to get decent performance. > > Do you happen to know if this new sysfs-way will work correctly in the > case where the MTRRs explicitly say that the video-memory is uncachable?
It should, since we'll be using PAT to set the cache control in the sysfs case.
Jesse
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