Microsoft comes to AMD Bulldozer rescue: Windows Update speeds up things

Interesting. Anyone tested this fix?

Ever wondered why some benchmark results on Bulldozer and its server version, Interlagos, look not just too low but outright weird? Part of the explanation was that the fancy modular architecture, where two integer and one FP block share one L2 cache and instruction scheduler, wasn't really supported that well by the current operating systems. Add to it the Pentium 4-style long pipeline and high latencies, and you got a problem.

Microsoft now has a kernel update solution that solves one part of the problem, at least - if you go to http://support.microsoft.com/kb/2592546/ knowledge base page, you'll notice that there is a patch for Windows 7 and for Windows Server 2008 R2.

This patch updates the thread management logic in the OS at the kernel level for the Bulldozer, and - interestingly - proclaims it as a multithreading feature. With this update, Windows sees each BD dual core block as A SINGLE MULTITHREADED CORE, contrary to AMD's official positioning. Therefore, BD is seen as a 4-core, 8-thread chip, rather than a fully 8-core processors. This update, nevertheless, brings a definite single-digit % performance jump in lightly threaded applications, but it is still good though as it helps the CPU fight higher speed grades of Intel processors in benchmarks. So, naming or no naming confusion, go ahead and have it, if you're one of the early Bulldozer users.


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United Kingdom El Gappo says:

Download for those looking http://www.megaupload.com/?d=81VA7JDF :)

Belgium Massman says:

Megaupload :(. I'll download and rehost ... //EDIT: hwbot link: http://91.121.148.119/downloads/tools/BDx86+x64patch.zip

K404 says:

From this:

Therefore, BD is seen as a 4-core, 8-thread chip, rather than a fully 8-core processors.
How does CPU-Z identify the chip once the patch is applied?

United Kingdom El Gappo says:

Still 8 cores.

Even if it were 4, it still wouldn't be competitive :(

Belgium Massman says:

If it would show 4 cores, I bet AMD would be dealing with a lot of lawsuits.

Poland jurek says:

cinebench shows 4c/8t http://www.overclock.net/t/1185039/the-1st-windows-7-scheduler-patch-results-are-in-have-fun#post_15952777

just_nuke_em says:

Mmm, something to mess around with when I get home.

Sweden ME4ME says:

not worth spending any time testing it seems; http://www.sweclockers.com/artikel/14855-testresultat-amd-fx-8150-med-kb2592546-uppdaterad-schemalaggare-i-windows-7

Belgium leeghoofd says:

seems some games lost the stutter issues. For the performance part it was all too predictable...think most tested different modules/affinity already... BD needs specially programmed applications to get decent performance... you just can't make an elephant fly...

United Kingdom El Gappo says:

Leeghoofd said: seems some games lost the stutter issues. For the performance part it was all too predictable...think most tested different modules/affinity already... BD needs specially programmed applications to get decent performance...

you just can't make an elephant fly...


Custom AMDOD smart profiles with affinity set correctly would be nice from AMD.

Apparently this was meant to be a 2 part patch hence being pulled? Dunno...

Christian Ney says:

Microsoft Fails


Bulgaria GunGod says:

Christian Ney said: Microsoft Fails


Again ? rofl

p.s. hope they release it soon with all cores ppl pay for :D

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