k10h post-BIOS patch effects

Guys,

One of the things due for 3.9 is new kernels for Core2Duo and AMD
Phenom/3rdgenOpteron.  Since my Phenom continues to randomly slow down
to half speed, I recently returned to the OpteronK10h for my first timings
since applying the BIOS patch to fix the k10h TLB errata.  It is not pretty!

My timings indicate as much as a 20% drop in performance in **GEMM**, which
is not really dominated by memory costs.  Level 2 performance dropped
something more like 30%.  The funny part was the AMD guy reassured me the
performance effects had been way overblown by fringe internet weirdos . . .

Anyway, the good news is that the machine no longer crashes once a day
(apparently a large threaded DGEMM is just as good as virtualization at
crashing a processor with this errata), the bad news is that the performance
is horrible.  I now own two AMD K10h, neither of which I can trust for tuning.
Fabulous.

Cheers,
Clint

**************************************************************************
** R. Clint Whaley, PhD ** Assist Prof, UTSA ** www.cs.utsa.edu/~whaley **
**************************************************************************

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