Messages in this thread | | | Date | Wed, 13 Nov 2002 17:38:05 -0800 (PST) | From | Linus Torvalds <> | Subject | RE: local APIC may cause XFree86 hang |
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On Wed, 13 Nov 2002, Nakajima, Jun wrote: > > The one instance I saw was that the BIOS was reading 8254 in a tight loop > for a calibration purpose, and it was assuming the time proceeded in a > constant speed, to exit the loop. In other words, it never assumed it could > get interrupts. To vm86, interrupts are invisible, but they have impacts on > the actual speed.
That sound slike a perfectly ok thing to do - apart from the hw latching which might confuse the kernel.
When enabling the local APIC, Linux doesn't actually disable legacy PIT interrupts, so again I don't really see what the apparent connection between the hang and the APIC is. So I'd still suspect it's more timing-related than anything else.
Linus
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