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Hardware Thread, AMDs FX-8150 "Bulldozer" Processor - The reviews are out! in Technical; ...
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    It looks like Bulldozer has another issue...

    http://scalibq.wordpress.com/2011/10...et-even-worse/

    AMD Bulldozer, can it get even worse?
    A number of reviewers have reported problems with a Blue Screen Of Death on AMD’s Bulldozer, even with stock settings:



    So apparently there is a problem with the multiprocessing in Bulldozer. The interrupt handling can get messed up at times.

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    Quote Originally Posted by Arthur View Post
    It looks like Bulldozer has another issue...

    AMD Bulldozer, can it get even worse? | Scali's blog
    Thats almost the exact same error the Wetmere EX gets under Hyper-V. In intels case its because of errors on the chip that cause it to randomly spew interupts when some of the cores end up in the C1E sleep state. Its almost like it gets night terrors and can't wake up. In intels case the only way around it for the time being is to simply switch off a bunch of the power saving features making it run about three times as hot.

    It is probably simmilar with the AMD, either a fab error or a Windows one but you can't be certain without further background on the problem.

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    This isn't strictly Bulldozer related but we've been lightly testing a Llano board & processor with some impressive results. Out of the box performance was awesome (windows 7 obviously) making our usual X3 boxes look very dated and slow. The clincher, however, was installing a demo of COD Modern Warfare and watching it run at an extremely playable 1920x1080 with no slowdown (default graphical settings). It looked good - it was a mile ahead of the Playstation/Xbox counterparts but with no dedicated graphics card.
    These obviously will work well with Windows 7 UI as well as things like SIMS Discover that will harness the power of the APU. The cost was hardly prohibitive either - it was the higher end CPU but ram was 8gb which costs less than a round at the pub, hard drives are pennies per gigabyte.

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    Quote Originally Posted by Dave84 View Post
    It is interesting that AMD is blaming Windows 7 for the bad performance results. Apparently Windows 7 is not aware of the core modules and the scheduler is putting threads in the wrong cores, so it would be interesting when we see the Windows 8 benchmarks to see if it is actually true.
    Microsoft released a hotfix (KB2592546) a couple of days ago which fixes the performance issues on Windows 7. I'm sure the three people who have bought Bulldozer CPUs will be very pleased.

    This article introduces an update that optimizes the performance of AMD Bulldozer CPUs that are used by Windows 7-based or Windows Server 2008 R2-based computers. Currently, the performance of AMD Bulldozer CPUs is slower than expected. This behavior occurs because the threading logic in Windows 7 and in Windows Server 2008 R2 is not optimized to use the Simultaneous Multithreading (SMT) scheduling feature. This feature was introduced in the Bulldozer family of AMD CPUs.

    After you install this hotfix, Windows 7 and Windows Server 2008 R2 fully support AMD Bulldozer CPUs. Therefore, the CPUs operate at the expected performance level.

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    Microsoft have pulled the hotfix.

    Update: We've spoken with an industry source familiar with this situation, and it appears the release of this hotfix was either inadvertent, premature, or both. There is indeed a Bulldozer threading patch for Windows in the works, but it should come in two parts, not just one. The patch that was briefly released is only one portion of the total solution, and it may very well reduce performance if used on its own. We're hearing the full Windows update for Bulldozer performance optimization is scheduled for release in Q1 of 2012. For now, Bulldozer owners, the best thing to do is to sit tight and wait. (Source)

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