linux-kernel - Re: lockup when C1E and high-resolution timers enabled

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Message-ID: <CAMVG2sun44_6QqNPBCUj7gdQGZyy9R_mULqkF-=Uv_wuUHV9oQ@mail.gmail.com>
Date:	Sun, 14 Jun 2015 11:13:04 +0800
From:	Daniel J Blueman <daniel@...ra.org>
To:	Christoph Fritz <chf.fritz@...glemail.com>
Cc:	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: lockup when C1E and high-resolution timers enabled

On Sunday, June 14, 2015 at 4:00:06 AM UTC+8, Christoph Fritz wrote:
> Hi,
>
>  on following computer configuration, I do get hard lockup under heavy
> IO-Load (using rsync):
>
>  - CONFIG_HIGH_RES_TIMERS=y
>  - CPU: AMD FX(tm)-8350 Eight-Core Processor (family 0x15 model 0x2)
>  - Motherboard: 'GA-970A-UD3P (rev. 1.0)' AMD 970/SB950
>  - BIOS: C1E enabled (on 'GA-970A-UD3P' there is no disable option)
>  - Kernels: 4.1.0-rc6, 4.0.x, 3.16.x
>
> Tests:
>  - add kernel parameter "idle=halt" -> system runs fine
>  - disable CONFIG_HIGH_RES_TIMERS -> system runs fine
>  - change motherboard and disable C1E -> system runs fine
>  - change CPU to AMD Phenom II X6 Processor -> system runs fine
[..]

C1E disconnects HyperTransport links when all cores enter C1 (halt)
for a period of time; this is all at the platform level, so isn't due
to the kernel. The AMD AGESA code which controls the setup of this
mechanism is updated in the F2g BIOS:
http://www.gigabyte.com/products/product-page.aspx?pid=4717#bios

Did you try both BIOS releases with defaults?

If still issues, also try with the current family 10h microcode from
http://www.amd64.org/microcode/amd-ucode-latest.tar.bz2

Thanks,
  Daniel
-- 
Daniel J Blueman
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