> > > Apple Macbook 2GHz (x86, not amd64) > > > > > Please try to remove processor module. > > > > > > > > Ok, that's done. Same problem. > > > > > > any difference with "idle=poll"? > > > if yes, how about "idle=halt"? > > > > idle=poll seems to fix the problem (cpu fan is running almost at full > > speed). Maybe I should run a longer test... For now it consists to run > > about 15 torrents and watching HDTV through ethernet device. > > > > idle=halt does not : > > It sounds like issues relative to Processor C state. > Please enter a bug in ACPI category on bugzilla.kernel.org
Actually, the test above with the processor module removed proved that it isn't ACPI C-states -- as they will not be available. You should be able to observe that /proc/acpi/processor/*/power does not indicate any C-state use when processor is unloaded. My guess was that some deep C-state with long exit latency was interfering with the device. booting w/o the processor module should have left you running the native mwait idle. booting with idle=halt should have left you running the HLT idle. booting with idle=poll is a busy spin loop that never enters any hardware power saving state. I'm quite puzzled that idle=halt was not sufficient to solve the issue, because that should be the lowest exit latency idle loop. So maybe I'm wrong about the cause -- though I can't then explain why idle=poll helps... All of the idle selection options cause the kernel to print a line with the word "idle" in it. Perhaps you could search your dmesg for "idle" to verify that it is running what we think it is? -Len - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
