On Thursday 24 January 2002 11:03, Bob Miller wrote: > Mark Bigler wrote: > > The story of the interaction of the Linux 2.4 kernel, AMD procs, > > and support chipsets continues. Anyone interested will want to > > take a look at gentoo's latest news on the issue: > > > > http://www.gentoo.org (see 23 Jan 2002 entry) > > So the GART is not cache coherent. D'oh! And the Athlon has been > out for 2.5 years... > > Which chip(s) is the GART on?
I believe it's in the northbridge, it's part of the AGP interface (there's a PCI GART as well, but I don't believe the standard kernel supports it). > Are there any other common IA32 system parts that aren't cache > coherent? I thought the IA32 architecture was relatively free of > that kind of nonsense. I guess for the GART it didn't seem to matter as much as speed (who wants to waste time snooping on the CPU, right?), but combined with speculative writes by the CPU, it turns into a problem.
