linux-kernel - Re: microcode loading got really slow.

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Date:	Thu, 23 May 2013 15:45:32 +0800
From:	Ming Lei <tom.leiming@...il.com>
To:	Dave Jones <davej@...hat.com>, "H. Peter Anvin" <hpa@...or.com>,
	Linux Kernel <linux-kernel@...r.kernel.org>, x86@...nel.org,
	fenghua.yu@...el.com, Takashi Iwai <tiwai@...e.de>
Subject: Re: microcode loading got really slow.

On Thu, May 23, 2013 at 11:39 AM, Dave Jones <davej@...hat.com> wrote:
>  > On 05/21/2013 04:03 PM, Dave Jones wrote:
>  >
>  > [   72.318133] microcode: CPU1 sig=0x306c3, pf=0x2, revision=0x6
>  > [  132.446449] microcode: CPU2 sig=0x306c3, pf=0x2, revision=0x6
>  > [  192.573101] microcode: CPU3 sig=0x306c3, pf=0x2, revision=0x6
>  > [  252.702055] microcode: Microcode Update Driver: v2.00 <tigran@...azian.fsnet.co.uk>, Peter Oruba
>  >
>  > For some reason the events for udev seem to be getting delayed 60s
>  > for each core.
>
> Screwed up my .config, and had CONFIG_FW_LOADER_USER_HELPER inadvertantly set
> Odd though that it causes that 60 second delay, given that it's supposedly a
> 'fallback' when the direct loading fails.

udevd has the ugly problem previously at some situations(for example,
request_firmware called in probe(), and that is why direct loading is
introduced),
but not sure why the direct loading is failed first.

Could you enable 'CONFIG_DEBUG_DRIVER' and post 'dmesg' out?
And better to check where the affected firmware(microcode) is in your
distribution.

>
> It seems I don't actually need to set that option, so I'm not bothered
> if there's an actual bug here or not, but the behaviour seems odd.

If the option isn't set, the firmware will be lost for the requested CPU, :-)

Thanks,
-- 
Ming Lei
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