Intel's Hyperthreading Hurting Server Performance?

ZDNet has an article running on how Intel's Hyperthreading hurts server performance with certain applications.  There have been instances reported with SQL Server and Citrix Terminal Server where under heavy load, performance degrades with HT enabled.  A Microsoft SQL Developer reported performance degrading and documents the details.  Apparently, the problem lies with the on-die cache being unable to keep up with a flurry of multi-threaded requests.  

"With both SQL Server and Citrix Terminal Server installations, HT-enabled motherboards show markedly degraded performance under heavy load. Disabling HT restores expected levels, according to reports from within the IT industry."

 

Via:  ZDNet
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