Messages in this thread | | | Subject | Re: [patch] Regression in 2.6.19-rc microcode driver | From | Shaohua Li <> | Date | Tue, 07 Nov 2006 09:20:27 +0800 |
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On Mon, 2006-11-06 at 15:15 +0100, Arjan van de Ven wrote: > Hi, > > if the microcode driver is built in (rather than module) there are some, > ehm, interesting effects happening due to the new "call out to > userspace" behavior that is introduced.. and which runs too early. The > result is a boot hang; which is really nasty. > > The patch below is a minimally safe patch to fix this regression for > 2.6.19 by just not requesting actual microcode updates during early > boot. (That is a good idea in general anyway) > > The "real" fix is a lot more complex given the entire cpu hotplug > scenario (during cpu hotplug you normally need to load the microcode as > well); but the interactions for that are just really messy at this > point; this fix at least makes it work and avoids a full detangle of > hotplug. Yes, this is an issue which I documented in my patch. It's not a hang, but a long delay if you have many cpus. Other drivers with firmware request have the same issue if they are built-in. Maybe we should fix the firmware request mechanism itself. I hope no distribution has microcode driver built-in.
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