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Date: Sat, 05 Nov 2011 08:07:37 +0800 From: hagar <hagar@...et.net.au> To: Joel Schopp <jschopp@...tin.ibm.com> CC: lkml <linux-kernel@...r.kernel.org>, Rusty Russell <rusty@...tcorp.com.au>, Srivatsa Vaddagiri <vatsa@...ibm.com>, Zwane Mwaikambo <zwane@....linux.org.uk>, Nathan Lynch <nathanl@...tin.ibm.com>, Ashok Raj <ashok.raj@...el.com>, Heiko Carstens <heiko.carstens@...ibm.com> Subject: Re: Fwd: Kernel Power management ?? turning off used devices that are in use. On 04/11/11 23:24, Joel Schopp wrote: > >> I need to be able to either switch off cpu hotpluging - or at least >> prevent hotplugging certain cpu's >> >> there should really be a mincpu's option or better a >> nohotplug="0,1,2,5,7,etc" option. >> >> It would appear that cpu1 is the default cpu for those interrupts - >> and they are not being transferred to cpu0 properly. >> > The proper way to fix this is to find why the interrupts are not being > transferred and fix that. Forcing cpus to not be hotpluggable is just > hiding the problem. > But it does allow the computer to become usable. At the moment it is extremely borderline. So much so that I would rather a non smp kernel and run off one cpu. I have difficulty keeping the network up. I have to run a cron job every minute to check the network and restart it if necessary. Watching an hour long streaming video is impossible without moving the usb mouse constantly. I am even considering a change of OS due to this problem. >> I have tried the kernel parameters noapic nosmp maxcpus acpi=off >> possible_cpus=2 etc - with no success >> >> I did find a flaw in "possible_cpus=0" - this prevents the kernel >> booting (no cpus available ) >> This option should be set to a minimum of 1 >> > We allow users to shoot themselves in the foot if they do silly > things. This is a design decision. > Quite amusing. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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