resume slow on Thinkpad T42 FreeBSD 8-STABLE

[Chuck Swiger]

On Sep 29, 2010, at 10:07 AM, Jeremy Chadwick wrote:
> On Wed, Sep 29, 2010 at 09:57:53AM -0700, Chuck Swiger wrote:
>> 
>> I doubt repeated coincidences.  :-)  Is prime95 testing running stable after waking from sleep?
> 
> He's not running Prime95 (native Win32 app), he's running
> ports/math/mprime under FreeBSD natively.  I don't know if this
> application stresses hardware to the same degree Prime95 does; I've used
> Prime95 many times to burn in new workstations.

It's doing the same math operations; something like "mprime -t" is the same as the Win32 test mode per the docs:

     -t              Run the torture test.  Same as Options/Torture Test.

> The Thinkpad hardware he's on is """old""" (note the quotes), so I
> wouldn't be surprised if the CPU (Intel Pentium M) happens to induce a
> strange/odd MCA event as a result of going in/out of sleep state.  It
> could be a general system bug of some sort as well (one which has no
> repercussions).

That sounds reasonable to me, but I'm wary of uncorrected errors which seem to be reproducible to specific circumstances.

> Look at it this way: if his L1 cache was going bad, his system would be
> freaking out doing literally anything (booting the kernel for example);
> I'm under the impression Pentium M CPUs do not have ECC L1 cache.

Sure, if the MCA report is reflecting a legitimate problem, and it was happening more often than every few minutes, and it happened after a cold reboot rather than after wakeup from sleep....  :-)

I place more faith in ~17 hours of Prime95/mprime working OK to validate that the hardware is not obviously broken.

Regards,
-- 
-Chuck