Re: k10h post-BIOS patch effects

by Mikhail Kuzminsky :: Rate this Message:

In message from Clint Whaley <whaley@...> (Wed, 16 Jul 2008
09:34:48 -0500):
>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,
Which Linux distro do you use ? You should kill all the
"power-sensual" daemons (like powersaved in SuSE) and remove the
corresponding kernel daemons like cpufreq.

> 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
>. . .

BIOS patch was declared as leading to some performance degradation.
The better choice is to patch Linux kernel (the patch was published on
AMD x86-64 electronic conference) - it must give minor performance
decrease.

Yours
Mikhail Kuzminsky
Computer Assistance to Chemical Research Center
Zelinsky Institute of Organic Chemistry
Moscow

>
>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 **
>**************************************************************************
>
>-------------------------------------------------------------------------
>This SF.Net email is sponsored by the Moblin Your Move Developer's
>challenge
>Build the coolest Linux based applications with Moblin SDK & win
>great prizes
>Grand prize is a trip for two to an Open Source event anywhere in the
>world
>http://moblin-contest.org/redirect.php?banner_id=100&url=/
>_______________________________________________
>Math-atlas-devel mailing list
>Math-atlas-devel@...
>https://lists.sourceforge.net/lists/listinfo/math-atlas-devel

-------------------------------------------------------------------------
This SF.Net email is sponsored by the Moblin Your Move Developer's challenge
Build the coolest Linux based applications with Moblin SDK & win great prizes
Grand prize is a trip for two to an Open Source event anywhere in the world
http://moblin-contest.org/redirect.php?banner_id=100&url=/
_______________________________________________
Math-atlas-devel mailing list
Math-atlas-devel@...
https://lists.sourceforge.net/lists/listinfo/math-atlas-devel

« Return to Thread: k10h post-BIOS patch effects