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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CACVXFVP3stgc2JKc31_yjPuokTbqcSrW_FWDvHrHK+NA-xu-yg@mail.gmail.com>
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
--
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/