> We run 8.2 happily on L5640's which are also hex-core CPU's so the issue
> could be bios / MB related and not cpu.
> Its likely unrelated given your debug info but when we have seem long
> hangs on boot in the past its been related to keyboard stuff. You might
> want to try the following at the loader to see if it helps:-
> set hint.atkbdc.0.disabled=1
> set hint.atkbd.0.disabled=1
> boot
> Regards
> Steve
Thanks, Steve. We have had problems with atkbd controller emulation
on these motherboards, and have a workaround for that in place equivalent
to the hints. I'll double-check that this isn't our problem here.
You are quite right, this could easily be related to the BIOS or MB.
Thanks,
Mike
----- Original Message -----
From: "Mike Karels" <[email protected]>
To: <[email protected]>
Cc: <[email protected]>
Sent: Monday, May 02, 2011 10:13 PM
Subject: variable hang when starting APs on Westmere processors
> Looks like freebsd-smp is gone... not sure of the right target for this.
>
> I just picked up a problem from another developer at work who had the good
> fortune to have scheduled a vacation this week. The short description is
> that the start_ap() routine sometimes hangs, from 10 minutes to 3 hours,
> while starting up CPUs. This is with a much-modified system based on
> FreeBSD 7.2. A stock 8.2 CD hangs at the same spot almost all the time,
> although the code in the two versions appears identical.
>
> More details: This is amd64, using an Intel S5520HCR 2-socket motherboard
> with two XEON X5660 2.8GHz Westmere hex-core CPUs. The problem happens
> somewhat less with two XEON E5620 Quad core 2.4GHz CPUs. The hang seems
> to happen with higher numbered CPUs, so the hex-core with SMT has more
> chances to hit the problem.
>
> We added KTRs to the code, and found that the hang happens in the
> lapic_ipi_wait() call after de-asserting RESET.
>
> Of course, Linux doesn't exhibit the problem.
>
> Has anyone else seen a problem like this? Any ideas how to fix it, or
> debug further?
>
> Please copy me on responses; I'm not subscribed to this list currently.
>
> Mike
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