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Advanced Micro Devices has officially said that once Windows 8 is available, its central processing units (CPUs) based on Bulldozer micro-architecture would gain performance. Nonetheless, an updated scheduler for Windows 7, which officially became available recently, will barely significantly improve AMD FX-series chips, according to the company.

AMD claims that in initial testing of the upcoming Windows 8 operating system, its experts had seen performance improvements of up to 10% in some applications, when compared to Windows 7, since the operating system correctly recognizes the AMD FX processor architecture and cores.  Thanks to close collaboration between Microsoft and AMD, Microsoft recently completed back-porting some of the Windows 8 scheduler code for AMD FX processors into a hotfix for Windows 7. Nonetheless, that hotfix does not improve performance that substantially.

“Our testing shows that not every application realizes a performance boost. In fact, heavily threaded apps (those designed to use all 8 cores), get little or no uplift from this hotfix – they are already maxing out the processor. In other cases, the uplift averages out to a 1% - 2% uplift,” said Adam Kozak, a product marketing manager at AMD.

Currently, performance of AMD central processing units based on Bulldozer micro-architecture (FX, Opteron 4200-, 6200-series) under Windows 7 and Windows Server 8 R2 is slower than expected because the threading logic in the operating system is not optimized to use the simultaneous multithreading (SMT) scheduling feature of AMD Bulldozer processors. The update optimizes the performance of AMD's latest CPUs that power Windows 7-based or Windows Server 2008 R2-based computers.

Back in October, 2011, AMD issued a document claiming that with next-generation Windows 8 scheduler its eight-core microprocessors will receive 2% - 10% performance boost over what was demonstrated by Windows 7.

Tags: AMD, Windows, Bulldozer, 32nm, Orochi, Zambezi

Discussion

Comments currently: 15
Discussion started: 01/11/12 01:03:08 PM
Latest comment: 02/10/12 10:35:41 AM
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1. 
This is so funny
1 0 [Posted by: cosminmcm  | Date: 01/11/12 01:03:08 PM]
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Actually, it's rather sad.
2 1 [Posted by: Astral Abyss  | Date: 01/11/12 01:08:50 PM]
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Indeed, we need more performance from AMD's CPU's to lower prices and increase competition ... we would be seeing i7's at 4+Ghz from intel by now if AMD had a killer product to compete... but they came out with a dud thats no better then what they already had on the market. Intel has free rain to slow down its CPU Lineup and do only release whats required to keep the cash incoming.
4 1 [Posted by: vid_ghost  | Date: 01/11/12 02:11:34 PM]
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You think the article is funny?? :-) Just wait for beenthere to make a pathetic excuse in behalf of amd.
1 1 [Posted by: dudde  | Date: 01/11/12 04:43:22 PM]
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2. 
Well there is AMD 10% figure Left 4 Dead 2. lol
2 0 [Posted by: SteelCity1981  | Date: 01/11/12 01:20:22 PM]
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3. 
As AMD wrote here: http://blogs.amd.com/play...dows®-7-scheduler-update
this is the scheduler model that will be used in Windows 8

Does it mean that we won't see any Win8 Bulldozer performance improvement?
1 0 [Posted by: Tester128  | Date: 01/11/12 01:46:41 PM]
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By the time windows 8 will be out Bulldozer 2 will be on the market and we will all get out 10% performance across the board...

Its a shame that at the same time intel will be out with its new CPU that will offer 30% improvement ontop of its current products that can be almost 100% faster
1 1 [Posted by: vid_ghost  | Date: 01/11/12 02:32:46 PM]
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Based on AMD, Windows 8 will boost performance of Bulldozer. Backporting the scheduler to Win7 does not provide any tangible improvement.
0 0 [Posted by: Anton  | Date: 01/12/12 07:29:20 AM]
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4. 
"In fact, heavily threaded apps (those designed to use all 8 cores), get little or no uplift from this hotfix – they are already maxing out the processor."

And this is natural. Problem reveals only in case when there are less working threads running than number of CPU cores.
Pre-Windows 8 shedulers does not distinguish between cores belonging to the same module of Bulldozer and cores belonging to separate modules.
In result sheduler may put two working threads on two cores of the same module, leaving other cores idle. Because cores in the same module share one FPU, performance will be lower than in case when two threads are running on cores belonging to two separate modules (especially if threads are FPU-intense).
If there are as many working threads as number of cores, sheduler simply cannot choose wrong.
1 0 [Posted by: KonradK  | Date: 01/11/12 02:11:48 PM]
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Well, since every module shares cache there may be a benefit to put threads from the same application at the same module when you have as many threads as the number of cores.
1 0 [Posted by: Sniglom  | Date: 01/12/12 12:13:51 AM]
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Good point!

Yes. If it is badly written application, where both threads processes tha same data at the same time. Such application can actually run faster on single- core processor than on multi-core processor without common cache (eg. Athlon64x2/3/4, or sometimes Core2Quad that has 2 pairs of L2 Caches - each for one pair of cores). In such case data are placed in much slower RAM, to avoid inconsistesy. L3 cache - common to all modules, or cores - somehow cure situation.
0 0 [Posted by: KonradK  | Date: 01/12/12 04:44:00 AM]
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5. 
We don't want to hear any performance boost under 150% for the time Windows 8 and second generation of Bulldozer processors arrive, because current performance of current Bulldozers belong to very past, not present, and for the future its gonna hurt more, 2-10 % really? You hear AMD?
3 1 [Posted by: Pouria  | Date: 01/11/12 02:47:05 PM]
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6. 
show the post
2 5 [Posted by: beenthere  | Date: 01/12/12 05:24:04 AM]
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7. 
There is a more recent hotfix that disables core parking on AMD FX and 4200/6200 series processors. Has this been tested with the scheduler update? This was released on the 11th of January.

http://support.microsoft.com/kb/2646060

0 0 [Posted by: GavinT  | Date: 01/16/12 03:22:34 PM]
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