Date: Wed, 29 Sep 2010 10:16:13 -0700 From: Chuck Swiger <cswiger@mac.com> To: Jeremy Chadwick <freebsd@jdc.parodius.com> Cc: freebsd-stable@freebsd.org, Vitaly Magerya <vmagerya@gmail.com> Subject: Re: resume slow on Thinkpad T42 FreeBSD 8-STABLE Message-ID: <2B9D8374-AA0A-4F2C-9681-5216204859F8@mac.com> In-Reply-To: <20100929170757.GA94672@icarus.home.lan> References: <20100224165203.GA10423@zod.isi.edu> <20100927170317.I90633@sola.nimnet.asn.au> <4CA0E892.4010204@gmail.com> <201009271621.17669.jkim@FreeBSD.org> <4CA2488D.7000101@gmail.com> <04FA16F2-26AD-425D-9E4A-2A923219B73E@mac.com> <4CA35E64.1040101@gmail.com> <0FDB4144-8BE4-4BA5-B911-8652E07D60C2@mac.com> <20100929170757.GA94672@icarus.home.lan>
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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
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