SuperMicro i7 (UP) - very slow performance

Bryce bryce at
Thu Sep 23 13:06:01 UTC 2010

On Sep 22, 9:35 am, nickolas... at wrote:
> > md5 -t is quite a small benchmark, even with his misfunctioning CPU it
> > took <6 seconds to complete.
> > If his problem is a misapplied heatsink/fan, then his CPU could be
> > throttling when it gets hot, the hotter it gets the more it throttles,
> > which could explain his massive buildworld walltime. Perhaps running
> > something like:
> >  apply -0 "md5 -t" `jot 10`
> > would display a notable difference.

I don't think is heat & throttling related.  Here's the temps while
doing a make -j16 buildworld:

dev.cpu.0.temperature: 57.0C
dev.cpu.1.temperature: 57.0C
dev.cpu.2.temperature: 54.0C
dev.cpu.3.temperature: 54.0C
dev.cpu.4.temperature: 57.0C
dev.cpu.5.temperature: 57.0C
dev.cpu.6.temperature: 55.0C
dev.cpu.7.temperature: 55.0C

IMO, the problem is preventing the system from even loading up the
CPU's enough to even get hot - I have never seen it over 61 C.  If sit
& watch top -P during a buildworld, it rarely get's all 8 CPU's loaded
up with idle numbers near 0%. A vast majority of the time one CPU is
maxed and the others are mostly idle.

> You may also run openssl speed or "linpack" test
> (/usr/ports/math/linpack) or hpl (/usr/ports/benchmarks/hpl) to load
> your CPU
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