Quoting Borja Marcos <bor...@sarenet.es> (from Thu, 11 Mar 2010
09:54:47 +0100):
On Mar 11, 2010, at 8:45 AM, Alexander Leidinger wrote:
Quoting Pawel Jakub Dawidek <p...@freebsd.org> (from Wed, 10 Mar
2010 18:31:43 +0100):
There is a 4th possibility, if you can rule out everything else:
bugs in the CPU. I stumbled upon this with ZFS (but UFS was
exposing the problem much faster). The problem in my case was that
the BIOS was not recognizing the CPU and as such was not uploading
microcode updates.
Borja, can you confirm that the CPU is correctly announced in
FreeBSD (just look at "dmesg | grep CPU:" output, if it tells you
it is a AMD or Intel XXX CPU it is correctly detected by the BIOS)?
A CPU bug? Weird. Very.
It depends. CPUs have bugs. You do not want to run any modern CPU
without an microcode update. The BIOS is doing it for you at system
start.
I do not want to say that this is the problem you have, I just want to
point out that it may be possible (but see below). I got hit by this
last december and I was finding the solution (replacing the complete
system, as only replacing the CPU was not an option) in January.
As the servers had to be rolled into production, and such tests with
real servers can be quite time consuming, I set up a couple of
FreeBSD virtual machines, using VMWare Fusion (version 2 then, now
version 3) on a Macbook (Macbook 4,1 Intel Core2Duo, 2.1 GHz) and
tried to reproduce it.
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Xeon(R) CPU L5420 @ 2.50GHz (2496.25-MHz
K8-class CPU)
Origin = "GenuineIntel" Id = 0x1067a Stepping = 10
The virtual machine (VMWare Fusion 3.0.0, Macbook, Mac OS X 10.6.2)
reports this:
Timecounter "i8254" frequency 1193182 Hz quality 0
CPU: Intel(R) Core(TM)2 Duo CPU T8100 @ 2.10GHz (2116.62-MHz
K8-class CPU)
Origin = "GenuineIntel" Id = 0x10676 Stepping = 6
Summary: you confirmed the problem on a different kind of CPU.
Because of this it makes it even more unlikely that it is a CPU problem.
Bye,
Alexander.
--
A good plan today is better than a perfect plan tomorrow.
-- Patton
http://www.Leidinger.net Alexander @ Leidinger.net: PGP ID = B0063FE7
http://www.FreeBSD.org netchild @ FreeBSD.org : PGP ID = 72077137
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