Re: git: kernel - SMP - "Fix AP #%d (PHY# %d) failed" issues
On Wed, Feb 10, 2010 at 4:54 PM, Matthew Dillon
<dillon@crater.dragonflybsd.org> wrote:
>
> commit bb467734fc407e2c2de7f8314c63dd9f708f4df4
> Author: Matthew Dillon <dillon@apollo.backplane.com>
> Date: Wed Feb 10 00:45:02 2010 -0800
>
> kernel - SMP - "Fix AP #%d (PHY# %d) failed" issues
Wow, this is amazing, I was always wondering what's happening to my
phenom boxes.
>
> Ok, here's what is going on. If an SMI interrupt occurs while
> an AP is going through the INIT/STARTUP IPI sequence the AP will
> brick, and nothing you do will resurrect it.
>
> BIOSes typically set up SMI interrupts when emulating (for example)
> a PS/2 keyboard with a USB keyboard, or even if just implementing
> BIOS support for a USB keyboard. Even worse, the BIOS may set up
> the interrupt to poll at 1000hz. And, EVEN WORSE, it can totally
> depend on which USB port you've plugged your keyboard in. And, on top
> of all of that, the SMI interrupt is not consistent.
>
> The INIT/STARTUP code contains a 10ms delay (as per Intel spec) between
> the INIT IPI and the STARTUP IPI. Well, you can do the math.
>
> In order to reliably boot a SMP system where the BIOS has set up
> SMI interrupts this patch uses a nifty bit of code to detect when
> the SMI interrupt has occurred and tries to shift the INIT/STARTUP
> sequence into a gap between SMI interrupts. If it has to it will
> reduce the 10ms spec delay all the way down to 150us. In many
> cases we really have no choice for reliable operation. Even a 300uS
> delay is too much in the tests I performed on a Shuttle Phenom and
> Phenom II cube. I don't honestly know if this will break other SMP
> configurations, we'll have to see.
>
> On the particular shuttle I tested on, one of the four USB connections
> on the backpanel (the upper left when looking at it from the back)
> seemed to cause the BIOS to set up SMI interrupts at a high rate and
> caused kernel boots to fail. With this commit those boots now succeed.
>
> Summary of changes:
> sys/platform/pc32/apic/apicreg.h | 2 +-
> sys/platform/pc32/apic/mpapic.c | 5 +
> sys/platform/pc32/i386/mp_machdep.c | 166 ++++++++++++++++++++++++++++-----
> sys/platform/pc32/include/smp.h | 1 +
> sys/platform/pc64/apic/apicreg.h | 2 +-
> sys/platform/pc64/apic/mpapic.c | 5 +
> sys/platform/pc64/include/smp.h | 1 +
> sys/platform/pc64/x86_64/mp_machdep.c | 155 ++++++++++++++++++++++++++----
> 8 files changed, 290 insertions(+), 47 deletions(-)
>
> http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/bb467734fc407e2c2de7f8314c63dd9f708f4df4
>
>
> --
> DragonFly BSD source repository
>
--
Live Free or Die
討論串 (同標題文章)
完整討論串 (本文為第 4 之 4 篇)：